1985 Mercury Marquis Ignition and Tune-Up Products

Below you will find various in-demand Mercury Ignition and Tune-Up Products, components and accessories for your 1985 Marquis. Advance Auto Parts has popular Marquis parts like Ignition Coils and Boots, Ignition Boots, Spark Plugs and more. You’ll also find aftermarket and OEM Ignition and Tune-Up Products for other Marquis model years including 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1986 and more. Select a category of 1985 Mercury Marquis Ignition and Tune-Up Products below and start saving instantly.

Popular 1985 Mercury Marquis Ignition and Tune-Up Products Categories

Standard Spark Plug Wires

Ignition Pickup and Stators

Optional Spark Plug Wires

Distributor Cap Kits

Ignition Module and Controls

Distributor Rotor Buttons

Ignition Coil Connectors

Ignition Starter Switches

Ignition Control Unit Harness

Ignition Control Module Connectors

Distributor Gears

Distributor Check Valves

Ignition Switch Connectors

Essential Ignition and Tune-Up Products for 1985 Mercury Marquis

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$6.49

E3 Spark Plugs are the product of years of fundamental research in the combustion field. The unique patented electrode configuration of these new E3 spark plugs increases the amount of combustion pressure created during each power stroke of an engine, which results in a marked increase in power output, fuel economy, and reduced emissions in all gasoline engines.

Product Features:

E3’s DiamondFire edge to edge electrode provides maximum performance with increased efficiency and a faster more complete burn
Smoother Acceleration & Idle – The faster flame initiated by the E3 spark plug results in a more complete burn of the ingested fuel charge. More pressure is created against the piston more fuel is put to work
Energy – Power output improved by 6% on average in the typical operating ranges
Efficiency – E3 “diamond shaped” side wire electrode projects the combustion spark in a way that more quickly ignites the air/fuel mixture, thereby creating a significantly faster and longer flame kernel
Emissions – E3 provides a cleaner burning combustion, which translates into fuel savings and reduced engine carbon deposits
E3 Spark Plugs are pre-gapped at the factory to meet O.E. requirements
Warranty does not cover plugs installed in any modified engine or used in any racing, aircraft, or commercial application. Spark plugs damaged by abuse, accidents, or improper installation or applications are not covered by this warranty.

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$8.29

CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.

Product Features:

Premium quality materials for longer service life
Sealed connections (where applicable) to prevent environmental corrosion and performance issues
Global coverage for import and/or domestic applications
OE specified wire gauge to ensure a reliable electrical connection
Designed to meet or exceed OE specifications in form, fit and function

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$7.29

Premium quality materials for longer service life
Sealed connections (where applicable) to prevent environmental corrosion and performance issues
Global coverage for import and/or domestic applications
OE specified wire gauge to ensure a reliable electrical connection
Designed to meet or exceed OE specifications in form, fit and function

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$41.49

Carquest Premium ignition coils meet or exceed original equipment (OE) specifications and are developed by top OE/OES manufacturers to ensure superior performance. All of our Carquest Premium ignition coils are developed by IATF 16949 certified manufacturers for consistent durability and long-lasting performance. These ignition coils use high-quality components and will utilize optimized designs on applications where the OE ignition coil had frequent failures. We require stringent testing standards to ensure proper fit and performance for each application and stand behind our Carquest Premium ignition coils with an industry-leading warranty. Carquest Premium ignition coils are part of our Carquest Vehicle Solutions, which is a full line of engine management and electronics products that help control ignition, fuel delivery and emission systems. Carquest Vehicle Solutions are OE-quality parts designed, engineered and tested by world-class manufacturers to ensure a reliable and long-lasting repair.

Product Features:

Computer-Aided Design (CAD), laser scanning and 3D printing – utilizing Fused Deposition Modeling (FDM) and Stereolithography (SLA) – in the part design process ensures speed-to-market and a precise fit guaranteed.
100% pure copper precision-wound windings increase coil life and ensure reliability and maximum coil output when needed.
Highly conductive aluminum alloy secondary terminal guarantees secondary coil terminals will not oxidize (rust), will provide excellent conductivity, extended coil life and will not cause excessive stress on the primary control circuit.
100% thermo-shock and vibration tested to ensure superior performance in extreme conditions.
100% end-of-line tested to ensure confidence and product reliability, every time.

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$128.99

These ACCEL carbon and graphite core wire sets virtually eliminate RFI noise, while providing maximum conductivity for ultimate performance in any race or street application. Double silicon insulation eliminates leakage and misfire.

Product Features:

Heavy Duty 8.8mm Oversized Silicone Jacket
500 Ohms/ft. Of Resistance
550 Degree Double Silicone Construction
Fiberglass Braid
Carbon/Graphite Core
Magnetic Suppression
Fiberglass/Kevlar Core
500 Ohms Resistance

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$24.99

CARQUEST premium engine management products provide the right automatic transmission speed sensor for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions. Designed to meet OE quali

Product Features:

Lifecycle tested to meet or exceed OE specifications
Direct OE replacement
High strength thermoplastic is resistant to shock, temperature and chemicals. Also protects internal components from moisture and contaminants.
Global coverage for import and/or domestic applications.

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$58.99

CARQUEST Ignition Modules are built by an ignition systems manufacturer with expertise in the entire vehicle spark system.

Product Features:

CARQUEST Ignition Modules creates and refines the timing of the engine using various sensors and readings throughout the spark system in order to create an efficiently running engine.
CARQUEST Ignition Modules use current and voltage limiting circuitry in order to prevent the ignition coil from over voltage/current. Over voltages can allow for coils to create excessive heat which can damage to the ignition module resulting in check eng
CARQUEST Ignition Modules are 100% individually tested for all product functionalities including over voltage, timing and dwell.

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$39.99

Product Features:

SAEJ2031 Class E cable resist heat (428 Deg. F), cold (-104 Deg. F), electrical interference, abrasion and oil.
Stainless steel magnetic winding delivers maximum voltage to the spark plug for more powerful, and longer spark resulting in optimum engine performance while reducing the chance for misfire, and eliminating radio static.
100% Pure silicone external insulation resists oil penetration, for lifetime protection against wire set failure.
EPDM inner insulation stops power-robbing voltage leaks.
With Magnetic-impregnated Kevlar internal conductors – durable and break resistant
Engineered to meet OEM tolerances using variable pitch wire winding, creating better resistance to electric magnetic interference (E.M.I resistance).
Excellent interference suppression and consistent performance
Easy lock terminals for more convenient installation.
Thick silicon outer jacket for excellent heat resistance. Insulating EPDM based compound inner jacket helps minimize voltage drop and enhance durability.
Broad coverage available for most vehicles on the road today
Include grease pack to ensure easy installation and removal

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$17.99

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$16.49

Distributor Cap and Rotor Kit

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$23.99

This ignition harness is designed to match the fit and function of the original harness on specified applications, and is engineered for reliable performance and durability.

Product Features:

Direct replacement – this ignition harness is designed to match the fit and function of the original harness on specified applications.
Ideal solution – this harness is a reliable replacement for an original harness that is missing, failed or damaged due to corrosion
Durable construction – this part is made from quality materials to ensure reliable performance and a long service life
Trustworthy quality – designed in the United States and backed by more than a century of automotive aftermarket excellence

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$10.49

Premium quality materials for longer service life
Sealed connections (where applicable) to prevent environmental corrosion and performance issues
Global coverage for import and/or domestic applications
OE specified wire gauge to ensure a reliable electrical connection
Designed to meet or exceed OE specifications in form, fit and function

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$15.79

Premium quality materials for longer service life
Sealed connections (where applicable) to prevent environmental corrosion and performance issues
Global coverage for import and/or domestic applications
OE specified wire gauge to ensure a reliable electrical connection
Designed to meet or exceed OE specifications in form, fit and function

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$129.99

Set includes terminals for engines with early type (socket) and late type (HEI spark plug top) distributor caps. 90 degree boots and terminals factory installed on one end.

Product Features:

Extra Long 8.5mm Wires So You Can Cut To Your Designed Length
Incl. both socket-style and spark plug-style boots and terminals
Includes Mini-Stripper-Crimper For Factory Style Crimps
Size Includes: [2]48/50/56 in./[3] 32 in. Wires/Boots/Terminals
Durable outer sleeve is a proprietary compound for resistance to high heat or abrasion
Stainless steel terminals feature dual crimp tabs to grip wire conductor and outer jacket separately

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$71.99

DENSO First Time Fit Ignition Wire Sets are identical in form fit color and performance to the factory-installed wire sets. Every part of each wire sets construction meets or exceeds OE/OES standards.

Product Features:

Each wire is pre-cut to exact length so the wire set is ready to install right out of the box
Identical OE end caps are designed to “click” into place for easy installation and a secure fit
Strong connections – through a patented process, the terminals are attached to provide an extremely strong connection, ensuring the cable and boot will not separate during removal and installation

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$9.49

High-quality products that meet OE appearance and performance to provide professional technicians and DIYers with a cost-effective solution.

Product Features:

High-quality products that meet OE appearance and performance to

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$15.79

MSD Ignition is a company built on Customer Satisfaction and Service. That is why all of MSD products go through regimented test procedures before they are ever packaged and shipped. MSD stands behind its products for one full year after purchase

Product Features:

Resist Carbon Tracking
Low Resistance Brass
Max Voltage Transfer
Molded From Insulated Material

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$17.79

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$36.99

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$7.99

ACDelco Gold (Professional) RAPIDFIRE Spark Plugs are a high quality alternative to Original Equipment (OE) parts. These RAPIDFIRE Single Platinum Performance Spark Plugs are designed for everyday use and are a high quality replacement for many vehicles on the road today. These premium aftermarket spark plugs have high-quality suppressors that help prevent misfiring, an improved plug to boot seal, and a pure copper core for greater durability. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function. ACDelco Gold (Professional) parts are manufactured to meet your expectations for fit, form, and function, making them a smart choice for General Motors vehicles, as well as most makes and models, including special applications. These high-quality parts are backed by General Motors. Some ACDelco Gold parts may have formerly appeared as ACDelco Professional.

Product Features:

Solid state suppressor, with two-piece glass and brass seal, can help reduce radio frequency interference, regulates spark energy for long electrode life, and helps protect against high combustion pressures
Pure copper core provides great heat transfer and helps maximize plug durability
Platinum on center electrode enables superior spark characteristics and can reduce voltage requirements of the ignition system
Ribless insulator helps optimize plug to boot seal
Some ACDelco Gold parts may have formerly appeared as ACDelco Professional
Premium aftermarket replacement part
Manufactured to meet specifications for fit, form, and function for General Motors vehicles as well as most makes and models

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$3.29

Motorcraft spark plugs are matched to specific engines to provide enhanced durability, eliminate misfires, reduce fuel consumption and optimize emissions.
Backed by Motorcraft’s Service Parts Warranty
Exact fit for Ford, Lincoln and Mercury vehicles
Resistant to oxidation and arc erosion.
Multi-rib insulator protects against misfire.
Service intervals of up to 100,000 miles.
Motorcraft Spark Plugs are designed with high quality materials to provide reliable performance for almost any application.
Motorcraft Spark Plugs are what was in the vehicle when it was manufactured
Motorcraft ignition components help prevent false check engine lights.

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$63.29

The street fire spark plug wires feature a low resistance conductor that’s wrapped in a sleek and durable black sleeve. The terminals are covered in black boots that protect the conductor from engine heat to ensure spark delivery.

Product Features:

Helically wound conductor suppresses electro and radio noise
Kevlar core combination for great strength and durability
Heavy Duty Terminals For Secure Connection
8mm silicone and synthetic jacket resists heat and abrasion
500 Ohms/ft. Resistance For Improved Spark Delivery And Power
Silicone Boots Protect Against High Exhaust Temps

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$91.99

The traditional ACCEL combination of yellow wire and red spark plug boots has been added to these SuperStock Spiral Core 5000 Series wire sets, which feature color-matched wire and spark plug boots in blue, black, and red. With only 500 ohms/ft. of resistance, more ignition energy can reach the spark plug, producing a longer-lasting, hotter spark flame kernel. The results is higher performance through improved efficiency, quicker throttle response, and reduced emissions. This 8mm wire’s double silicone construction is rated to 550 degrees F. The high-gloss wire jacket resists moisture, chemicals, and heat extremes for longer life and great looks. The fiberglass braid adds greater pull strength and terminal retention, while the stainless steel spark plug terminals provide excellent long life, electrical conductivity, and corrosion resistance. Both universal and custom-fit applications are available for early and late model cars and trucks.

Product Features:

500 Ohms/ft Of Resistance
550 F Rated Silicone Jacket
Stainless Steel Plug Terminals
High RFI Suppression For Street And Strip Use
Universal And Import Coverage
High-strength Fiberglass Braid Construction
Pre And Post HEI Vehicles
8mm High Gloss Silicone Jacket

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$143.99

COMP Cams Composite Distributor Gears have undergone stringent testing in various applications with positive results. These super tough gears show great promise in solving the wear issues associated with bronze gears in racing applications. They are available in several shaft diameters for popular street and race applications.

Product Features:

Fits .530″ Shaft Diameter, Small Block Ford
Manufactured from a super-strong composite material
300% increased durability over bronze distributor gears when used with steel camshafts
Tested and available in several shaft diameters for popular street and race applications

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$73.29

Mallory distributor gears are precision machined from alloy steel in our factory to exact original equipment specs. For use with cast flat tappet hydraulic/mechanical cams and austempered ductile iron roller cams.

Product Features:

Replacement Distributor Gear

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$49.99

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$40.99

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$45.99

Upgrade your 1985 Mercury Marquis with Top-Quality Ignition and Tune-Up Products

When it comes to maintaining or upgrading your 1985 Mercury Marquis, nothing is more important than using high-quality OEM or aftermarket parts that you can trust. Whether you’re repairing damage to your Mercury or enhancing its overall performance, Ignition and Tune-Up Products are key to keeping your Marquis functioning at its best. At Advance Auto Parts, we offer a wide selection of 94 Ignition and Tune-Up Products for the 1985 Mercury Marquis, designed to meet your needs without breaking the bank. From Ignition Coils and Boot replacements to Ignition Boots upgrades, we’ve got you covered with parts that fit your vehicle perfectly and ensure long-lasting performance.

Affordable Prices and Wide Selection

Shopping for Ignition and Tune-Up Products for any vehicle can be a hassle, especially if you’re on a budget. But with Advance Auto Parts, you can find high-quality Ignition and Tune-Up Products for your 1985 Mercury Marquis at great prices. Our Ignition and Tune-Up Products inventory for this model ranges from just $2.49 to $166.99, with an average price of $28.99. Our 94 Ignition and Tune-Up Products in stock come from 19 trusted brands, so you’re sure to find the right part for your 1985 Mercury Marquis without overspending.

Top Brands and High Customer Satisfaction

Advance Auto Parts takes pride in offering only the best brands in the automotive industry. For your 1985 Mercury Marquis, we stock popular OEM and aftermarket Ignition and Tune-Up Products from top names like DENSO, NGK, Carquest, and more. DENSO Ignition and Tune-Up Products start at just $3.85 and boast an impressive 5 stars average rating from customers. NGK and Carquest also bring quality to the table, with Ignition and Tune-Up Products available starting at $4.29, and at an average 5 stars rating. With 1,788 customer reviews and counting, our 1985 Mercury Marquis Ignition and Tune-Up Products have a strong track record of reliability, ensuring you can trust your purchase.

Explore Related Parts and More

While you’re here, don’t forget to check out other essential categories that go hand in hand with Ignition and Tune-Up Product upgrades. Explore related part types like Batteries and Chargers, Oil and Lubricants and more to make sure your 1985 Mercury Marquis is always ready to roll. We’re committed to providing you with everything you need to keep your Marquis in top shape, all in one place. Start shopping confidently below for your 1985 Mercury Marquis!

Best-Selling Ignition Coils and Boots for 1985 Mercury Marquis

Enhance the driving experience in your Mercury with 15 quality Ignition Coils and Boot components, starting at $7.29.

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$21.05

BWD SELECT® replacement parts are designed, specified and manufactured with one goal in mind – to make them the very best. We use the finest materials and improve on OE specifications whenever possible. The result is maximum performance and longevity.

Product Features:

Manufactured with copper windings and permanent magnets to ensure strong signal emission and improved performance
High temperature enameled wires were specified for better insulation and performance
The BWD SELECT® HEI/DIS ignition coils have solid brass high voltage terminals. The benefit is better connections and greater corrosion resistance.
BWD is a global manufacturer of original equipment ignition products, complete quality control is maintained through the manufacturing process from componentry to finished product

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$17.05

BWD is an aftermarket leader, providing a premium line of engine management products. BWD manufactures and distributes high technology critical components for late model domestic and import vehicles. BWD is constantly evolving to give customers the competitive edge they need to compete in today’s ever-changing marketplace.

Product Features:

Our knock sensors are designed to respond to knock frequencies up to 1000 Hz accommodating shifts in engine knock frequency making it a more flexible sensor responding to correct engine knock over a broad range of vehicle conditions
Manufacturing processes include an automated data acquisition system to continuously monitor the sensor output to ensure that it responds with appropriate voltage output at the specified frequency range
All units are 100% tested using an accelerometer vibration test to ensure trouble-free operation
Featuring the broadest sensor coverage in the market, we meet the service professionals needs with the highest quality product every time he opens the box
BWD is a global manufacturer of original equipment ignition products, complete quality control is maintained through the manufacturing process from componentry to finished product

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$36.05

Driveworks® offers a line of aftermarket parts and accessories that are commercially acceptable and competitively priced, which provides professional technicians and DIYers with an affordable alternative for repairs.

Product Features:

Direct-fit OE replacement ensures ease of installation
Designed to meet OE performance
As the leader in commercially acceptable parts, we provide professional technicians with the quality parts they need
As the leader in commercially acceptable parts, we provide professional technicians with the quality parts they need

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$101.99

500 Ohms/ft Of Resistance
550 F Rated Silicone Jacket
Stainless Steel Plug Terminals
High RFI Suppression For Street And Strip Use
Universal And Import Coverage
High-strength Fiberglass Braid Construction
Pre And Post HEI Vehicles
8mm High Gloss Silicone Jacket

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$71.99

Top off your GM ignition system with these great new replacement coils. The GM coils have MSD performance in factory style housings. MSD designed these coils by combining our blaster coil experience with e-core coil efficiency. Each coil has a unique turns ratio plus there is lower primary resistance than the stock coil. This all amounts to a bolt-in replacement coil that produces more output voltage. The coils will work with stock ignition systems as well as MSD equipped cars and trucks. Installation tip: If you plan to install an MSD ignition with your GM dual connector coil, use PN 8876 harness for a direct plug-in installation.

Product Features:

Direct performance replacement for Ford TFI coil
85:1 turns ratio
Lower Primary Resistance Produces High Voltage Output
Works w/Stock Ignition As Well As MSD Ignitions
CARB E.O. Approved

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$37.99

Built by IATF 16949 certified manufacturers for consistent durability
Coil drivers match OE for current limit, electrostatic discharge (ESD) protection and multi-spark
Segmented secondary bobbins to distribute high voltage and prevent shorting
Extensive design validation testing to ensure long-lasting reliability
100% end-of-line tested to ensure proper performance
Carquest Vehicle Solutions Technical Support available from ASE certified technicians: 1-866-687-5413

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$36.99

Carquest ignition coils meet original equipment (OE) fit, form and function and are built to ensure reliable starting and performance. Carquest ignition coils are tested to ensure proper spark and perfect fit for each application. These ignition coils are an affordable repair choice to restore the vehicle¿s ignition system performance. Carquest ignition coils are part of our Carquest Vehicle Solutions, which is a full line of engine management and electronics products that help control ignition, fuel delivery and emission systems. Carquest Vehicle Solutions are OE-quality parts designed, engineered and tested by world-class manufacturers to ensure a reliable and long-lasting repair.

Product Features:

Long service life and durable performance
High dielectric strength for reliability
Corrosion-resistant connections
Carquest Vehicle Solutions Technical Support available from ASE certified technicians: 1-866-687-5413
High reliability
Long service life

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$27.99

Computer-Aided Design (CAD), laser scanning and 3D printing – utilizing Fused Deposition Modeling (FDM) and Stereolithography (SLA) – in the part design process ensures speed-to-market and a precise fit guaranteed.
100% pure copper precision-wound windings increase coil life and ensure reliability and maximum coil output when needed.
Highly conductive aluminum alloy secondary terminal guarantees secondary coil terminals will not oxidize (rust), will provide excellent conductivity, extended coil life and will not cause excessive stress on the primary control circuit.
100% thermo-shock and vibration tested to ensure superior performance in extreme conditions.
100% end-of-line tested to ensure confidence and product reliability, every time.

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$17.99

Computer-Aided Design (CAD), laser scanning and 3D printing – utilizing Fused Deposition Modeling (FDM) and Stereolithography (SLA) – in the part design process ensures speed-to-market and a precise fit guaranteed.
100% pure copper precision-wound windings increase coil life and ensure reliability and maximum coil output when needed.
Highly conductive aluminum alloy secondary terminal guarantees secondary coil terminals will not oxidize (rust), will provide excellent conductivity, extended coil life and will not cause excessive stress on the primary control circuit.
100% thermo-shock and vibration tested to ensure superior performance in extreme conditions.
100% end-of-line tested to ensure confidence and product reliability, every time.

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$18.29

Premium quality materials for longer service life
Sealed connections (where applicable) to prevent environmental corrosion and performance issues
Global coverage for import and/or domestic applications
OE specified wire gauge to ensure a reliable electrical connection
Designed to meet or exceed OE specifications in form, fit and function

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$7.29

Premium quality materials for longer service life
Sealed connections (where applicable) to prevent environmental corrosion and performance issues
Global coverage for import and/or domestic applications
OE specified wire gauge to ensure a reliable electrical connection
Designed to meet or exceed OE specifications in form, fit and function

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$32.99

Product Features:

SAEJ2031 Class E cable resist heat (428 Deg. F), cold (-104 Deg. F), electrical interference, abrasion and oil.
Stainless steel magnetic winding delivers maximum voltage to the spark plug for more powerful, and longer spark resulting in optimum engine performance while reducing the chance for misfire, and eliminating radio static.
100% Pure silicone external insulation resists oil penetration, for lifetime protection against wire set failure.
EPDM inner insulation stops power-robbing voltage leaks.
With Magnetic-impregnated Kevlar internal conductors – durable and break resistant
Engineered to meet OEM tolerances using variable pitch wire winding, creating better resistance to electric magnetic interference (E.M.I resistance).
Excellent interference suppression and consistent performance
Easy lock terminals for more convenient installation.
Thick silicon outer jacket for excellent heat resistance. Insulating EPDM based compound inner jacket helps minimize voltage drop and enhance durability.
Broad coverage available for most vehicles on the road today
Include grease pack to ensure easy installation and removal

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$76.99

Universal, 12-volt coil features an oil-filled design and arc resistant alkyd top for superior performance, insulation and cooling. The internal design of this coil eliminates the need for a separate ballast resistor. This coil is specifically designed to deliver optimum performance when used with: Mallory UNILITE or magnetic breaker less ignitions Mallory HYFIRE IV electronic ignition controls, and Mallory electronic ignition conversion kits.

Product Features:

12 Volt Coil
Oil-Filled Design
Arch Resistant Alkyd Top
Designed To Deliver Optimum Performance

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$52.99

Delphi OE technology ignition products are validated to match the vehicles system; OE quality replacement parts for the right fit , form and function; Delphi coils provide OE performance, durability and electromagnetic capacity level requirements.

Product Features:

Delphi coils provide OE performance, durability and electromagnetic capacity level requirements
Delphi ignition coils are designed to operate as part of an integral engine management system to insert power into spark plugs and ensure fast starts; consistent engine performance and optimized fuel efficiency
Delphi uses winding process techniques to control the length of wire between adjacent windings; that’s important since more length means greater voltage differences and can create more pressure that could break down the insulation and wire coating
We back our ignition coil design with proven materials, such as high quality wires and wire coating that resists the cracks, pin holes and imperfections that most often lead to failure issues

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$41.99

COIL

Most Popular 1985 Mercury Marquis Ignition Boots

Customize your Mercury with 5 Ignition Boots products like Spark Plug Boots, all priced under $89.99.

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$89.99

500 Ohms/ft Of Resistance
550 F Rated Silicone Jacket
Stainless Steel Plug Terminals
High RFI Suppression For Street And Strip Use
Universal And Import Coverage
High-strength Fiberglass Braid Construction
Pre And Post HEI Vehicles
8mm High Gloss Silicone Jacket

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$50.99

Each wire is pre-cut to exact length so the wire set is ready to install right out of the box
Identical OE end caps are designed to “click” into place for easy installation and a secure fit
Strong connections – through a patented process, the terminals are attached to provide an extremely strong connection, ensuring the cable and boot will not separate during removal and installation

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$35.99

NGK ultra-low resistance mag core wire sets provide outstanding performance and durability. High-temp premium silicone outer jacket and inner EPDM/silicone insulation contain high voltage currents for excellent dielectric strength. Stainless steel winding

Product Features:

PERFECT FIT FOR YOUR VEHICLE: Built to OEM tolerances with OE quality or better materials
BUILT TO LAST: Outer Jacket built to withstand temperatures greater than 250 degrees C, inner insulation EPDM or silicone for best dielectric strength
STAINLESS STEEL TERMINALS: Provide the highest possible retention to ensure positive connections through the life of the set
CYLINDER LEAD ID: Cylinder lead identification tags where possible make installation easier

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$32.49

PERFECT FIT FOR YOUR VEHICLE: Built to OEM tolerances with OE quality or better materials
BUILT TO LAST: Outer Jacket built to withstand temperatures greater than 250 degrees C, inner insulation EPDM or silicone for best dielectric strength
STAINLESS STEEL TERMINALS: Provide the highest possible retention to ensure positive connections through the life of the set
CYLINDER LEAD ID: Cylinder lead identification tags where possible make installation easier

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$35.49

PERFECT FIT FOR YOUR VEHICLE: Built to OEM tolerances with OE quality or better materials
BUILT TO LAST: Outer Jacket built to withstand temperatures greater than 250 degrees C, inner insulation EPDM or silicone for best dielectric strength
STAINLESS STEEL TERMINALS: Provide the highest possible retention to ensure positive connections through the life of the set
CYLINDER LEAD ID: Cylinder lead identification tags where possible make installation easier

Top Picks for 1985 Mercury Marquis Spark Plugs

Upgrade Mercury Marquis with top-quality Spark Plugs parts, including 32 OEM and aftermarket selections for your 1985 model.

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$3.49

Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Guaranteed to deliver quick starts, good fuel economy and smooth acceleration, Autoline Copper Core spark plugs are designed to meet or exceed OES design requirements. Consider upgrading to Autolite Platinum, Double Platinum or Iridium XP plugs for improved engine performance. Copper core plugs are the industry standard.

Product Features:

Copper-glass seal bonds insulator, terminal post center electrode together; assures full required voltage at spark gap; gas-tight seal (100% leak proof)
Multi-rib insulator reduces danger of “flash-over”
One-piece terminal post adds strength
Resistor reduces radio frequency interference (RFI) and electrode erosion
Quick Starts: Autolite Copper Core spark plugs are engineered to ensure your engine starts quickly and efficiently.
Good Fuel Economy: Designed to optimize fuel consumption, these spark plugs help you achieve better mileage.
Smooth Acceleration: Experience smoother and more responsive acceleration with Autolite Copper Core spark plugs.
OES Design Compliance: These spark plugs meet or exceed Original Equipment Service (OES) design requirements, ensuring reliable performance.
Tapered Seat Type: Featuring a tapered seat type, these spark plugs provide a secure fit and optimal performance.

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$5.99

NGK G-Power Platinum spark plugs are the best single platinum spark plugs at an economical price. G-Power plugs feature a fine wire platinum center electrode and a trapezoidal cut ground electrode that offers increased durability, improved fuel efficiency, lower emissions, faster starts and quicker acceleration over conventional nickel spark plugs. An excellent upgrade for vehicles which used nickel alloy spark plugs originally. For better performance consider upgrading to a NGK Iridium IX plug. For even greater performance consider upgrading to a NGK RUTHENIUM HX plug.

Product Features:

SINGLE PLATINUM TIP: Fine wire 0.6 millimeter platinum tip center electrode ensures improved durability and a consistently stable spark
PLATINUM ALLOY: G-Power platinum provides exceptional value with increased performance and longer service intervals than factory nickel plugs
TRAPEZOIDAL CUT GROUND ELECTRODE: Reduces quenching design produces improved ignitability and performance
SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
COLD-ROLLED THREADS: Prevents cross-threading and damage to cylinder heads
RECOMMENDED USAGE: Lower cost alternative to double precious metal spark plugs or as an upgrade to OE nickel alloy spark plugs
Enhanced Performance: Provides better performance over conventional nickel spark plugs, making it a smart choice for vehicle maintenance.
Tapered Seat Type: Designed with a tapered seat type for a secure fit and optimal performance.

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$11.99

NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode’s durability is six times harder than platinum. Iridium alloy’s extremely high melting point is perfect for today’s engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.

Product Features:

SINGLE IRIDIUM TIP: Fine wire 0.6 millimeter iridium tip center electrode ensures high durability and a consistently stable spark
IRIDIUM ALLOY CENTER ELECTRODE: Iridium’s density (6x that of platinum) and extremely high melting point is perfect for modern high efficiency engines
TAPERED CUT GROUND ELECTRODE: Reduced quenching design produces outstanding ignitability, improved acceleration, fuel efficiency and durability
SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs

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$4.49

With over 100 years of engineering expertise and more than 11 billion plugs sold, Autolite continues to lead the industry. Designed and engineered in the USA, these spark plugs feature a high nickel alloy side electrode that maintains a precise gap, and a full platinum tip that ensures virtually no gap erosion for extended life. The necked-down center electrode fires quicker and cleaner with less voltage, resulting in easier starts, quicker acceleration, and improved fuel economy compared to standard plugs. The tapered seat type further enhances performance and durability.

Product Features:

High nickel alloy side electrode maintains precise gap
Full platinum tip assures virtually no gap erosion for long life
Necked-down center electrode fires quicker, cleaner with less voltage for easier starts, quicker acceleration and improved fuel economy (as compared to standard plugs)
Tapered Seat Type: Enhances performance and durability for a reliable driving experience.

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$2.49

Motorcraft Spark Plugs are original equipment on Ford Motor Company vehicles, engineered to meet strict Ford engineering standards for optimal performance and reliability. These spark plugs are matched to specific engines to provide enhanced durability, eliminate misfires, reduce fuel consumption, and optimize emissions. They are resistant to oxidation and arc erosion, feature a multi-rib insulator to protect against misfire, and offer service intervals of up to 100,000 miles. Backed by Motorcraft’s Service Parts Warranty, these spark plugs are an exact fit for Ford, Lincoln, and Mercury vehicles and are designed with high-quality materials to ensure reliable performance for almost any application. Motorcraft ignition components also help prevent false check engine lights, making them a dependable choice for both domestic and import cars and trucks of all makes and sizes.

Product Features:

Motorcraft spark plugs are matched to specific engines to provide enhanced durability, eliminate misfires, reduce fuel consumption and optimize emissions.
Backed by Motorcraft’s Service Parts Warranty
Exact fit for Ford, Lincoln and Mercury vehicles
Resistant to oxidation and arc erosion.
Multi-rib insulator protects against misfire.
Service intervals of up to 100,000 miles.
Motorcraft Spark Plugs are designed with high quality materials to provide reliable performance for almost any application.
Motorcraft Spark Plugs are what was in the vehicle when it was manufactured
Motorcraft ignition components help prevent false check engine lights.
Enhanced Durability: Engineered to meet strict Ford engineering standards, these spark plugs are designed to provide long-lasting performance and withstand harsh conditions.

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$9.99

This spark plug non fouler is designed for easy installation on specified vehicles to protect spark plugs from fouling and damage. It is engineered for durability and reliable performance.

Product Features:

Direct replacement – this spark plug non fouler is designed for easy installation to protect spark plugs from fouling and damage on specified vehicles.
Ideal solution – this non-fouler preserves spark plug life and is a reliable replacement for an original non-fouler that has failed due to corrosion
Durable construction – made from quality components to ensure reliable performance and a long service life
Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience

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$4.29

NGK V-Power spark plugs offer reliable performance and improved ignitability over standard nickel plugs. Engineered specifically for OE applications, the special V-cut nickel alloy center electrode and concave ground electrode of NGK’s V-Power spark plug increases ignitability providing quicker starts and smoother idle. NGK’s legendary high grade alumina silicate ceramic creates a stronger insulator for optimal dielectric performance. Trivalent metal plating ensures superior anti-corrosion and anti-seizing properties.

Product Features:

ACTUAL OE or EQUIVALENT DESIGN: OEM quality construction nickel alloy center electrode with V-groove provides consistent performance
RECOMMENDED USAGE: Best for vehicles with OE nickel alloy plugs, not recommended on vehicles with factory precious metal plugs
NGK’s OE CERAMIC TECHNOLOGY: High grade alumina silicate ceramic creates a stronger insulator for optimal dielectric performance
SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
COLD-ROLLED THREADS: Prevents cross-threading and damage to cylinder heads
TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
Enhanced Ignitability: The V-cut nickel alloy center electrode and concave ground electrode design of NGK V-Power spark plugs provide quicker starts and smoother idle.
OE Application Specific: Engineered specifically for Original Equipment (OE) applications, ensuring compatibility and reliable performance in your vehicle.
Reliable Performance: NGK V-Power spark plugs deliver consistent and reliable performance, making them a dependable choice for maintaining your vehicle’s ignition system.

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$6.29

Product Features:

Platinum center and ground electrode for greater wear resistance

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$10.99

Durability of an OE style plug combined with Power & Torque of high performance.

Product Features:

0.4mm Iridium Center Electrode: World’s Smallest Diameter that maximizes firing potential
0.7mm Needle Tip Ground Electrode: Promotes higher spark energy and less heat quenching
DENSO Patented Optimized Iridium-Rhodium Alloy Formula: Highest concentration of Iridium vs. competitors for greater durability
DENSO Patented 360 degree laser welding process: Ensuring exceptional quality bond and structural strength with the Iridium Center Electrode
Durability of an OE style plug combined with Power & Torque of high performance.
Withstands temperatures greater than 4000░ Fahrenheit
Iridium TT
Advanced Twin-Tip Technology: Combines a Fine Wire Iridium Center Electrode with a Needle Tip Platinum Ground Electrode for superior ignition and efficiency.
Enhanced Fuel Economy and Lower Emissions: Designed to provide better fuel economy and reduced emissions, allowing you to drive around the Earth over 4 times.
Original Equipment Specification: Developed from the Super Ignition Plug (SIP) design, ensuring reliable and consistent performance.

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$4.49

ACTUAL OE or EQUIVALENT DESIGN: OEM quality construction nickel alloy center electrode with V-groove provides consistent performance
RECOMMENDED USAGE: Best for vehicles with OE nickel alloy plugs, not recommended on vehicles with factory precious metal plugs
NGK’s OE CERAMIC TECHNOLOGY: High grade alumina silicate ceramic creates a stronger insulator for optimal dielectric performance
SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
COLD-ROLLED THREADS: Prevents cross-threading and damage to cylinder heads
TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
Enhanced Ignitability: The V-cut nickel alloy center electrode and concave ground electrode design of NGK V-Power spark plugs provide quicker starts and smoother idle.
OE Application Specific: Engineered specifically for Original Equipment (OE) applications, ensuring compatibility and reliable performance.
V-Groove Tip Design: The unique V-Groove tip design of the TR55-1 model enhances ignitability and overall engine performance.

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$11.79

Increased performance with World’s smallest Iridium Center Eletrode (0.4mm).

Product Features:

World’s smallest Iridium Center Electrode (0.4mm) for improved spark for maximum combustion
Patented 360-degree laser welding assembly process
U-groove and taper cut ground electrode to maximize flame propagation.
Withstands temperatures greater than 4000° Fahrenheit
Burnished nickel plating for high temperature endurance and superior corrosion resistance
Wide range of part numbers for thousands of applications, including classic and collector cars
Iridium Power

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$5.99

Twin-Tip design enables faster flame propagation for more complete combustion.

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$5.49

Motorcraft Spark Plugs are original equipment on Ford Motor Company vehicles, engineered to meet strict Ford engineering standards for performance and reliability. These spark plugs are matched to specific engines to enhance durability, eliminate misfires, reduce fuel consumption, and optimize emissions. With a platinum center and ground electrode tip, they are resistant to oxidation and arc erosion, ensuring long-lasting performance. The multi-rib insulator protects against misfires, and they are backed by Motorcraft’s Service Parts Warranty. Designed for exact fit in Ford, Lincoln, and Mercury vehicles, these spark plugs also help prevent false check engine lights and offer service intervals of up to 100,000 miles. Crafted with high-quality materials, Motorcraft Spark Plugs provide reliable performance for a broad range of applications, including domestic and import cars and trucks of all makes and sizes.

Product Features:

Motorcraft spark plugs are matched to specific engines to provide enhanced durability, eliminate misfires, reduce fuel consumption and optimize emissions.
Backed by Motorcraft’s Service Parts Warranty
Exact fit for Ford, Lincoln and Mercury vehicles
Resistant to oxidation and arc erosion.
Multi-rib insulator protects against misfire.
Service intervals of up to 100,000 miles.
Motorcraft Spark Plugs are designed with high quality materials to provide reliable performance for almost any application.
Motorcraft Spark Plugs are what was in the vehicle when it was manufactured
Motorcraft ignition components help prevent false check engine lights.
Engineered for Ford Vehicles: Motorcraft Double Platinum Spark Plugs are original equipment on Ford Motor Company vehicles, ensuring a perfect fit and optimal performance for Ford, Lincoln, and Mercury models.

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$6.49

Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Designed and engineered in the USA, Autolite Double Platinum spark plugs feature platinum-to-platinum firing which virtually eliminates gap erosion, reduces misfires and increases durability of the plug. Consider upgrading to Autolite Iridium XP spark plugs for increased performance.

Product Features:

Works to optimize engine performance for a longer life and improved fuel economy
OE design
Full-platinum tips; platinum on both the center and side electrodes to promote reduced gap wear
Platinum ball welding process provides a consistent point of contact for enhanced adhesion

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$2.49

Dependable performance. This Champion spark plug features a copper core electrode that provides increased conductivity and heat control for good overall wear.

Product Features:

Copper Plus – Dependable Performance.
Copper core center electrode allows for accurate control of heat range for longer life
Patented TinTac and ULTRASEAL coated shell for maximum corrosion resistance
Patented SAC-9 semiconductor resistor for maximum EMI & RFI suppression
Built to ISO and SAE standards for proven performance

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$5.29

Motorcraft spark plugs are matched to specific engines to provide enhanced durability, eliminate misfires, reduce fuel consumption and optimize emissions.
Backed by Motorcraft’s Service Parts Warranty
Exact fit for Ford, Lincoln and Mercury vehicles
Resistant to oxidation and arc erosion.
Multi-rib insulator protects against misfire.
Service intervals of up to 100,000 miles.
Motorcraft Spark Plugs are designed with high quality materials to provide reliable performance for almost any application.
Motorcraft Spark Plugs are what was in the vehicle when it was manufactured
Motorcraft ignition components help prevent false check engine lights.

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$10.20

The Bosch Super Plus Spark Plug utilizes an yttrium enhanced copper core center electrode, making it one of the longest lasting copper core spark plug on the market – by 50% versus even OE plugs. Bosch Super Plus also features a tapered, v-profile ground electrode for improved cold starts and better fuel ignitability. Center Electrode Core Material: Nickel-Yttrium and Copper – Center Electrode Tip Material: Nickel-Yttrium – Ground Electrode Tip Material: Nickel-Chromium

Product Features:

OE-Equivalent and direct fit application.
Heavy-duty yttrium-enhanced copper core center electrode.
Tapered, v-profile nickel chromium ground electrode.
Nickel-plated rolled threads.
Metal glass fused resistor.
Angular, five-ribbed insulator design.
Electrode gap is factory set and never requires adjustment.
Anti-seize and corrosion protection. Bosch Super Plus Spark Plugs deliver quality performance based on technology that’s proven on racetracks around the world in the most sophisticated racing engines

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$9.99

SINGLE IRIDIUM TIP: Fine wire 0.6 millimeter iridium tip center electrode ensures high durability and a consistently stable spark
IRIDIUM ALLOY CENTER ELECTRODE: Iridium’s density (6x that of platinum) and extremely high melting point is perfect for modern high efficiency engines
TAPERED CUT GROUND ELECTRODE: Reduced quenching design produces outstanding ignitability, improved acceleration, fuel efficiency and durability
SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs

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$9.35

The NGK Standard copper core spark plug provides OEM quality, consistent performance and extended long life.

Product Features:

Trivalent Metal Plating Provides Superior Anti-Corrosion and Anti-Seizing Properties
Corrugated Ribs Prevent Flashover
Pure Alumina Silicate Ceramic Insulator, Provides Superior Strength and Better Heat Transfer
Copper Core Aids in Heat Removal
Triple Seals Prevent Leakage

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$8.99

Autolite® Iridium XP Enhanced Alloy Technology Spark Plugs is one of the brand’s most technologically advanced spark plugs ever. These spark plugs provide better durability and a more focused ignition for better overall ignitability and optimum performance. Autolite® spark plugs are the best alternativ e to OE spark plugs, offering OE form, fit and function for all makes and models, both foreign and domestic, at a value price. Autolite provides the automotive aftermarket and original equipment manufacturers with the highest quality ignition products and is the leading supplier of spark plugs.

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$8.29

Motorcraft Spark Plugs are original equipment on Ford Motor Company vehicles engineered to meet strict Ford engineering standards to provide original equipment performance and reliability. Delivering performance, reliability and confidence, Motorcraft spark plugs are available for a broad range of applications, including domestic and import cars and trucks of all makes and sizes.

Product Features:

Motorcraft spark plugs are matched to specific engines to provide enhanced durability, eliminate misfires, reduce fuel consumption and optimize emissions.
Backed by Motorcraft’s Service Parts Warranty
Exact fit for Ford, Lincoln and Mercury vehicles
Resistant to oxidation and arc erosion.
Multi-rib insulator protects against misfire.
Service intervals of up to 100,000 miles.
Motorcraft Spark Plugs are designed with high quality materials to provide reliable performance for almost any application.
Motorcraft Spark Plugs are what was in the vehicle when it was manufactured
Motorcraft ignition components help prevent false check engine lights.

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$8.29

Champion Iridium – the ultimate element. This spark plug’s fine-wire iridium center and platinum ground electrodes provide the sharpest spark focus for maximum performance.

Product Features:

Champion Iridium – Maximum Performance. Premium Spark Plug
Iridium center electrode delivers maximum life
Fine-wire center electrode and V-trimmed for greater ignitability
V-trimmed ground electrode promotes sharper spark focus
Maintains stable operating temperature under all engine loads
Heat-Active alloy allows electrodes to reach optimal temperature quickly

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$6.42

2X longer service life compared to standard copper plugs Bosch Platinum Spark Plugs are the newest member of our OE fine wire spark plug family. From the brand trusted in the world’s most advanced engines, Bosch Platinum Spark Plugs are engineered to provide you with improved ignitability and performance.

Product Features:

OE design for optimum fit and function
Fine wire design delivers improved ignitability and performance life
Center electrode is an ultra fine wire design.
Copper core provides broader heat range to resist pre-ignition
Tapered shape ground electrode reduces flame shrouding for improved combustion
Yttrium enhanced to resist wear
Nickel-plated shell with rolled threads
Ribbed insulator design

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$4.99

Motorcraft Original Equipment spark plugs are designed, engineered and recommended by Ford Motor Company.

Product Features:

Same part installed when the engine rolled off the assembly line
30,000-mile service interval
Copper core electrode and nickel chromium alloy side electrode for excellent heat dissipation and durability.
Resistor reduces radio frequency interference (RFI) and electrode erosion
Copper-glass seal bonds insulator and terminal post center electrode together to ensure full required voltage at spark gap and a gas-tight seal

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$4.63

SPARK PLUG

from

$4.49

SINGLE PLATINUM TIP: Fine wire 0.6 millimeter platinum tip center electrode ensures improved durability and a consistently stable spark
PLATINUM ALLOY: G-Power platinum provides exceptional value with increased performance and longer service intervals than factory nickel plugs
TRAPEZOIDAL CUT GROUND ELECTRODE: Reduces quenching design produces improved ignitability and performance
SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
COLD-ROLLED THREADS: Prevents cross-threading and damage to cylinder heads
RECOMMENDED USAGE: Lower cost alternative to double precious metal spark plugs or as an upgrade to OE nickel alloy spark plugs

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$3.99

Champion® Platinum Power¿ spark plugs deliver powerful performance. Made from exclusive Heat-Active¿ alloy, a fine-wire center electrode and V-trimmed ground electrode provides sharp spark focus.

Product Features:

Platinum Power- Premium Spark Plug. Powerful Performance.
Platinum center electrode for long life
Fine-wire center electrode for greater ignitability
V-trimmed ground electrode promotes sharper spark focus
Heat-Active┐ alloy allows electrodes to reach optimal temperature
Platinum tipped center wire resists wear and helps to maintain proper gap spec over life of the plug

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$3.85

Denso Spark Plug Denso’s standard plugs have always offered a patented U-groove ground electrode producing for a larger, hotter spark. Copper core for better thermal conductivity. Machine rolled threads to reduce cross-threading and seizing . The plug insulator is constructed of purified alumina powder for extreme stress with 5 ribs to prevent flashover.

Product Features:

U-Groove Ground Electrode Promotes Ignitability and Decreases Quenching
Fully Projected Insulator Reduces Carbon Fouling
Machine Rolled Threads Prevent Seizing or Cross Threading During Installation and Removal
100% Pre-Fired to Assure the Highest Quality Possible
Purified Alumina Powder Insulator Provides Exceptional Strength and Thermal Conductivity
Five Rib Insulator Prevents Flashover
Copper-Glass Seal Bonds Center Electrode and Insulator for a Gas-Tight Seal

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$3.54

Motorcraft Original Equipment Copper Core spark plugs are designed, engineered and recommended by Ford Motor Company.

Product Features:

Same part installed when the engine rolled off the assembly line
Designed to deliver quick starts, enhanced fuel economy and smooth acceleration

from

$2.99

SPARK PLUG

from

$2.99

Copper-glass seal bonds insulator, terminal post center electrode together; assures full required voltage at spark gap; gas-tight seal (100% leak proof)
Multi-rib insulator reduces danger of “flash-over”
One-piece terminal post adds strength
Resistor reduces radio frequency interference (RFI) and electrode erosion

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$2.99

Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Guaranteed to deliver quick starts, good fuel economy and smooth acceleration, Autolite Copper Core spark plugs are designed to meet or exceed OES design requirements. Consider upgrading to Autolite Platinum, Double Platinum or Iridium XP plugs for improved engine performance. Copper core plugs are the industry standard.

Product Features:

Copper-glass seal bonds insulator, terminal post center electrode together; assures full required voltage at spark gap; gas-tight seal (100% leak proof)
Multi-rib insulator reduces danger of “flash-over”
One-piece terminal post adds strength
Resistor reduces radio frequency interference (RFI) and electrode erosion

In-Demand Ignition Wires for 1985 Mercury Marquis

Select from 4 premium Ignition Wires parts for your 1985 Mercury Marquis, with prices ranging from $88.99 to $143.99.

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from

$143.99

Set includes terminals for engines with early type (socket) and late type (HEI spark plug top) distributor caps. 90 degree boots and terminals factory installed on one end.

Product Features:

Extra Long 8.5mm Wires So You Can Cut To Your Designed Length
Incl. both socket-style and spark plug-style boots and terminals
Includes Mini-Stripper-Crimper For Factory Style Crimps
Size Includes [6] 90 Deg. Boots/Terminals
Durable outer sleeve is a proprietary compound for resistance to high heat or abrasion
Stainless steel terminals feature dual crimp tabs to grip wire conductor and outer jacket separately

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$91.99

500 Ohms/ft Of Resistance
550 F Rated Silicone Jacket
Stainless Steel Plug Terminals
High RFI Suppression For Street And Strip Use
Universal And Import Coverage
High-strength Fiberglass Braid Construction
Pre And Post HEI Vehicles
8mm High Gloss Silicone Jacket

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$128.99

Heavy Duty 8.8mm Oversized Silicone Jacket
500 Ohms/ft. Of Resistance
550 Degree Double Silicone Construction
Fiberglass Braid
Carbon/Graphite Core
Magnetic Suppression
Fiberglass/Kevlar Core
500 Ohms Resistance

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$88.99

Motorcraft Plug Wires are Manufactured of premium-quality materials to strict Ford Engineering standards. High-Dielectric Insulation helps maintain and control voltage delivery while reducing Radio Frequency Interference. EPDM/Silicone wire jacket, spark plug & coil/ distributor insulators help protect against oil and high temperatures. Optimized wire lengths help minimize part numbers while still providing proper fit. Designed and Tested to Stringent Ford Standards.

Product Features:

Backed by Motorcraft’s Service Parts Warranty
Designed for long life – key life durability testing (equivalent to 10 years/150,000 miles) is conducted in addition to on-vehicle durability testing.
Optimized wire lengths help minimize part numbers while still providing proper fit.
Wires are optimum lengths for easy installation.
EPDM/Silicone wire jacket, spark plug AND coil / distributor insulators help protect against oil and high temperatures.
Motorcraft ignition components help prevent false check engine lights.

Most Sold 1985 Mercury Marquis Distributors

Explore our best-selling Mercury parts for the 1985 Marquis among 21 OEM and aftermarket options starting from $7.49.

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from

$18.05

Each Fuel Vapor Canister is a direct-fit OE replacement that ensures ease of installation
High-quality materials withstand extreme conditions
Undergoes extensive testing to ensure reliability
Capitalizing on decades of research and development, our distributor caps and rotors contain unmatched quality yielding superior performance
BWD is a global manufacturer of original equipment ignition products, complete quality control is maintained through the manufacturing process from componentry to finished product

from

$32.99

The only parts recommended by Ford Motor Company for Ford, Lincoln and Mercury vehicles.

Product Features:

Motorcraft and Ford Parts are used throughout Ford vehicles in a variety of applications that help ensure the proper build quality, integrity and long-lasting performance of every Ford car or truck.
Motorcraft and Ford Parts are manufactured from first-quality materials – chosen specifically for maximum performance and application suitability.
As with all Motorcraft and Ford Parts, any innovations or improvements developed since the vehicle’s manufacture are included in these after market replacement parts, ensuring the most current technology and performance.

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$11.05

Driveworks offers a line of aftermarket parts and accessories that are commercially acceptable and competitively priced, which provides professional technicians and DIYers with an affordable alternative for repairs.

Product Features:

Direct-fit OE replacement ensures ease of installation
Designed to meet OE performance
As the leader in commercially acceptable parts, we provide professional technicians with the quality parts they need
As the leader in commercially acceptable parts, we provide professional technicians with the quality parts they need

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$18.05

BWD SELECT replacement parts are designed, specified and manufactured with one goal in mind – to make them the very best. We use the finest materials and improve on OE specifications whenever possible. The result is maximum performance and longevity.

Product Features:

Each Flasher is a direct-fit OE replacement that ensures ease of installation
High-quality materials withstand extreme conditions
Undergoes extensive testing to ensure reliability
BWD is a global manufacturer of original equipment ignition products, complete quality control is maintained through the manufacturing process from componentry to finished product

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$12.99

Product Features:

High-quality direct replacement electrical connector allows you to replace only the damaged connector instead of the entire harness for a cost-effective repair
The terminal is manufactured with high grade materials such as copper alloy, brass, and phosphor bronze. The housing is fabricated using polyamide resins. All of the materials together provide the connectors with prolonged life and superior performance.
All electrical connectors are 100% tested for proper mechanical and electrical fit, form and function
Offering thousands of high-quality pigtails & sockets for nearly every electrical job

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$12.99

BWD SELECT designs, specifies, and manufactures replacement parts with one goal in mind-make them the very best. To maximize performance and longevity, we use the finest materials and improve on OE specifications, whenever possible.

Product Features:

High-quality direct replacement electrical connector allows you to replace only the damaged connector instead of the entire harness for a cost-effective repair
The terminal is manufactured with high grade materials such as copper alloy, brass, and phosphor bronze. The housing is fabricated using polyamide resins. All of the materials together provide the connectors with prolonged life and superior performance.
All electrical connectors are 100% tested for proper mechanical and electrical fit, form and function
Offering thousands of high-quality pigtails & sockets for nearly every electrical job

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$16.05

Direct-fit OE replacement ensures ease of installation
Designed to meet OE performance
As the leader in commercially acceptable parts, we provide professional technicians with the quality parts they need
As the leader in commercially acceptable parts, we provide professional technicians with the quality parts they need

from

$12.99

Carquest premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.

from

$11.79

from

$12.99

High-quality products that meet OE appearance and performance to provide professional technicians and DIYers with a cost-effective solution.

Product Features:

High-quality products that meet OE appearance and performance to

from

$9.49

High-quality products that meet OE appearance and performance to provide professional technicians and DIYers with a cost-effective solution.

Product Features:

High-quality products that meet OE appearance and performance to

from

$19.99

from

$20.99

Each Canister Purge Valve is a direct-fit OE replacement that ensures ease of installation
High-quality materials withstand extreme conditions
Undergoes extensive testing to ensure reliability
BWD is a global manufacturer of original equipment ignition products, complete quality control is maintained through the manufacturing process from componentry to finished product

from

$7.49

from

$67.99

from

$24.99

Lifecycle tested to meet or exceed OE specifications
Direct OE replacement
High strength thermoplastic is resistant to shock, temperature and chemicals. Also protects internal components from moisture and contaminants.
Global coverage for import and/or domestic applications.

from

$20.79

Distributor Cap and Rotor Kit

from

$20.79

Distributor Cap and Rotor Kit

from

$19.49

Distributor Cap and Rotor Kit

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$13.49

Distributor Cap

from

$11.99

Lifecycle tested to meet or exceed OE specifications
Direct OE replacement
High strength thermoplastic is resistant to shock, temperature and chemicals. Also protects internal components from moisture and contaminants.
Global coverage for import and/or domestic applications.

Top-Rated Ignition and Tune-Up Products Brands For Your 1985 Mercury Marquis

Shop for the best-rated brands offering Ignition and Tune-Up Products and other products for your 1985 Mercury Marquis. Below you’ll find some of our best rated Ignition and Tune-Up Products from DENSO, NGK, and Carquest, and more. Ignition and Tune-Up Products from these brands that fit a 1985 Marquis start at just $3.85 and are rated as high as 5 stars. OEM and aftermarket Ignition and Tune-Up Products don’t get more top quality, durable, and affordable than from the brands below.

Popular DENSO 1985 Mercury Marquis Ignition and Tune-Up Products

When it comes to maintaining or upgrading your 1985 Mercury Marquis, using quality Ignition and Tune-Up Products is essential to ensure durability and a perfect fit. DENSO ticks all of those boxes. We offer a wide selection of DENSO Ignition and Tune-Up Products, specifically designed for the 1985 Mercury Marquis. With over 5 DENSO brand Ignition and Tune-Up Products in stock, you’re sure to find what you need. The prices for these top-notch parts start as low as $3.85, with an average price of just $16.72. Plus, with over 158 customer reviews and an average rating of 5 stars, you can trust that our DENSO Ignition and Tune-Up Products will get the job done right. Choose Advance Auto Parts for reliability, quality, and expert-approved parts that keep your vehicle running strong.

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$50.99

This product is not rated

Spark Plug Wire Set: Carbon Core, 6 Wire Set

“”

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$3.85

This product is not rated

Standard U-Groove Spark Plug

“”

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$10.99

(46)

Iridium TT Spark Plug: Ultimate Endurance and Power, 0.4mm Iridium Tip, IT16TT

“2500HD 6.0 runs much smoother”

Popular NGK 1985 Mercury Marquis Ignition and Tune-Up Products

NGK auto parts is one of the highest quality Ignition and Tune-Up Product brands in the market. Any 1985 Mercury Marquis owner should feel confident when installing genuine NGK parts in their vehicle. To ensure the best fit and performance for your 1985 Marquis, Advance Auto Parts carries a full inventory of 10 NGK Ignition and Tune-Up Products. Plus you will be keeping your Mercury in peak condition while saving money because prices on these NGK Ignition and Tune-Up Products range from $4.29 to $35.99, plus, with more than 366 customer reviews and an impressive 5 stars average rating, you can be confident the Fram Ignition and Tune-Up Products below will deliver on both quality and value.

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$35.49

This product is not rated

NGK Wire Set

“”

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$32.49

This product is not rated

NGK Wire Set

“”

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$35.99

This product is not rated

NGK Wire Set

“”

FAQs for 1985 Mercury Marquis Ignition and Tune-Up Products

Which Ignition and Tune-Up Products are best-sellers for 1985 Mercury Marquis?

Out of 94 Ignition and Tune-Up Products that fit 1985 Mercury Marquis, the following parts are the top sellers:

Iridium TT Spark Plug: Ultimate Endurance and Power, 0.4mm Iridium Tip, IT16TT (10713000) – $10.99
Iridium Power Spark Plug: Maximum Spark Energy, 0.4mm Iridium Tip, IT16 (20650525) – $11.79
Distributor Cap (20170464) – $18.05

What’s the price range for 1985 Mercury Marquis Ignition and Tune-Up Products?

Ignition and Tune-Up Product prices for the 1985 Mercury Marquis start at $2.49 and go up to $166.99 for the most premium parts.

What’s the average price of a Ignition and Tune-Up Product for a 1985 Mercury Marquis?

The average price for Ignition and Tune-Up Products for the 1985 Mercury Marquis is $28.99. Keep in mind the variety of part types within our Ignition and Tune-Up Product category so you are likely to find a wide range of prices across a variety of parts and components.

Does Advance Auto Parts sell Ignition and Tune-Up Products for other Mercury Marquis model years?

Yes, we currently carry Ignition and Tune-Up Products for 19 model years of Mercury Marquis between 1967 and 1986. Ignition and Tune-Up Products are bought most frequently for the following model years: 1986, 1984, 1983, 1982, 1981, 1980, 1979, 1978, and 1977.

What are the cheapest Ignition and Tune-Up Products for my 1985 Mercury Marquis?

The cheapest 1985 Mercury Marquis Ignition and Tune-Up Products we carry in stock are:

Standard Spark Plug: Enhances Durability & Reduces Fuel Consumption (18090003) – $2.49
Copper Plus Spark Plug: Dependable Performance, OE Replacement, RS14LC (5470021) – $2.49
SPARK PLUG (50011473) – $2.99
Copper Spark Plug: Delivers Quick Starts, Good Fuel Economy, Smooth Acceleration (5392144) – $2.99
Copper Spark Plug: Delivers Quick Starts, Good Fuel Economy, Smooth Acceleration (11668252) – $2.99

What are the top-rated Ignition and Tune-Up Products that fit the 1985 Mercury Marquis?

Out of 1,788 reviews by customers, our 1985 Mercury Marquis Ignition and Tune-Up Products have an average customer rating of . These are some of the highest-rated Ignition and Tune-Up Product types for the 1985 Mercury Marquis and their top-rated products:

Spark Plugs
- Iridium IX Spark Plug: Single Iridium Fine Wire, TR55-1IX (18090271) – $11.99
- Standard Spark Plug: Enhances Durability & Reduces Fuel Consumption (18090003) – $2.49
- G-Power Spark Plug: Single Platinum Tip Design, TR55-1GP (18090259) – $5.99
Ignition Wires
- Iridium IX Spark Plug: Single Iridium Fine Wire, TR55-1IX (18090271) – $11.99
- Standard Spark Plug: Enhances Durability & Reduces Fuel Consumption (18090003) – $2.49
- G-Power Spark Plug: Single Platinum Tip Design, TR55-1GP (18090259) – $5.99
Ignition Switches
- Iridium IX Spark Plug: Single Iridium Fine Wire, TR55-1IX (18090271) – $11.99
- Standard Spark Plug: Enhances Durability & Reduces Fuel Consumption (18090003) – $2.49
- G-Power Spark Plug: Single Platinum Tip Design, TR55-1GP (18090259) – $5.99

What types of Ignition and Tune-Up Products do you sell for my 1985 Mercury Marquis?

As of 2/5/25, these are some of the most in-demand types of Ignition and Tune-Up Products for a 1985 Mercury Marquis:

Can I get help with 1985 Mercury Marquis Ignition and Tune-Up Product orders?

Contact our customer support team, by chat or phone, through the help desk page, where you can find instant answers about Mercury Ignition and Tune-Up Products and more.

What is your return policy for Mercury Marquis Ignition and Tune-Up Products?

Advance Auto Parts keeps returns simple. For new Mercury Marquis Ignition and Tune-Up Products and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.

1985 Mercury Marquis Ignition and Tune-Up Products

E3 – Premium DiamondFIRE Electrode Automotive Spark Plug (Part No.E3.60)

Carquest Premium – Ignition Switch Connector (Part No.PTA1283)

Carquest Premium – Ignition Coil Connector (Part No.PTC1111)

Carquest Premium – Ignition Coil: Meets or Exceeds Original Equipment Specifications, 1 Piece (Part No.EBC1715)

Accel – Universal Fit Graphite Suppression; Spark Plug Wire Set (Part No.8026)

Carquest Premium – Distributor Check Valve (Part No.ECA1336)

Carquest Premium – Ignition Module (Part No.CBG1008)

Carquest Premium – Spark Plug Wire Set: 9 Wires, Increased performance, Designed for direct fit (Part No.35-8184)

Carquest Premium – Distributor Cap Adapter (Part No.CAC1078)

Carquest Premium – Distributor Cap and Rotor Kit (Part No.CAC1814)

Dorman – 6 – Wire Ford Ignition Module (Gray) (Part No.85130)

Carquest Premium – Ignition Control Module Connector (Part No.PTA1296)

Carquest Premium – Ignition Control Module Connector (Part No.PTA1257)

MSD Ignition – Wire Set; Super Conductor; 8-cyl. Multi-Angle Plug; Socket/HEI (Part No.31199)

DENSO – Spark Plug Wire Set: Carbon Core, 9 Wire Set (Part No.671-8081)

Carquest – Distributor Rotor (Part No.23A1004)

MSD Ignition – Rotor; Ford V8; Cap-A-Dapt (Part No.8407)

Carquest Premium – Ignition Switch (Part No.CSC1346)

Carquest Premium – Ignition Switch (Part No.CSC1892)

ACDelco – Rapidfire Spark Plug (Part No.1)

Motorcraft – Spark Plug (AGSF52C) (Part No.SP-442)

MSD Ignition – Wire Set; Street Fire; Ford 302; 351W; HEI (Part No.5541)

Accel – 8Mm Super Stock Spiral Uni Bk (Part No.5040K)

Competition Cams – .530" I.D. Composite Distributor Gear for Ford 302-351W (Part No.35100)

Mallory – Distributor Drive Gear (Part No.29420)

Carquest Premium – Distributor Ignition Pickup (Part No.MEC2266)

Carquest Premium – Distributor Ignition Pickup (Part No.MEC2265)

Carquest Premium – Distributor Ignition Pickup (Part No.MEA2275)

Carquest – Ignition Coil (Part No.E71)

Carquest – Ignition Coil Connector (Part No.PT753)

Driveworks – Electronic Ignition Coil (Part No.26286)

Accel – 8Mm Super Stock Spiral Uni Rd (Part No.5040R)

MSD Ignition – Ignition Coil (Part No.8227)

Carquest Premium – Ignition Coil: Meets or Exceeds OE Specifications, 1 Count (Part No.EBC1829)

Carquest – Ignition Coil: Meets OE Specifications, 1 Count (Part No.26C1038)

Carquest Premium – Ignition Coil: Meets or Exceeds Original Equipment Specifications, 1 Piece (Part No.EBC1717)

Carquest – Ignition Coil: Meets or Exceeds Original Equipment Specifications, 1 Piece (Part No.26C1073)

Carquest Premium – Ignition Coil Connector (Part No.PTA1082)

Carquest Premium – Ignition Coil Connector (Part No.PTC1111)

Carquest Premium – Spark Plug Wire Set: 6 Wires, Increased performance, Designed for direct fit (Part No.35-4130)

Mallory – Universal Street Performance Ignition Coil (Part No.29219)

Delphi – Ignition Coil (Part No.GN10183)

Edelbrock – COIL (Part No.22739)

Accel – 8Mm Super Stock Spiral Uni Bu (Part No.5040B)

DENSO – Spark Plug Wire Set: Carbon Core, 6 Wire Set (Part No.671-4051)

NGK – NGK Wire Set (Part No.52293)

NGK – NGK Wire Set (Part No.52301)

NGK – NGK Wire Set (Part No.52289)

Autolite – Copper Spark Plug: Delivers Quick Starts, Good Fuel Economy, Smooth Acceleration (Part No.2545)

NGK – G-Power Spark Plug: Single Platinum Tip Design, TR55-1GP (Part No.7159)

NGK – Iridium IX Spark Plug: Single Iridium Fine Wire, TR55-1IX (Part No.7316)

Autolite – Platinum Spark Plug: Fires Cleaner, Easier Starts, Quicker Acceleration (Part No.AP5145)

Motorcraft – Standard Spark Plug: Enhances Durability & Reduces Fuel Consumption (Part No.SP-409)

Dorman – Help – Spark Plug Non-Foulers – 14mm Tapered Seat (Part No.42008)

NGK – OE Series V-Power Nickel Spark Plug: V-Groove Tip Design, TR5-1 (Part No.7060)

Champion – Double Platinum & Power Spark Plug Exceptional Perf OE Replacement RS14ZPYPB (Part No.7407)

DENSO – Iridium TT Spark Plug: Ultimate Endurance and Power, 0.4mm Iridium Tip, IT16TT (Part No.4713)

NGK – OE Series V-Power Nickel Spark Plug: V-Groove Tip Design, TR55-1 (Part No.2683)

DENSO – Iridium Power Spark Plug: Maximum Spark Energy, 0.4mm Iridium Tip, IT16 (Part No.5325)

DENSO – PT16TT Platinum TT Spark Plug (Part No.4511)

Motorcraft – Double Platinum Spark Plug: Reduces Fuel Consumption & Misfires (Part No.SP-482)

Autolite – Double Platinum Spark Plug (Part No.APP5145)

Champion – Copper Plus Spark Plug: Dependable Performance, OE Replacement, RS14LC (Part No.407)

Motorcraft – Spark Plug (AWSF44CA) (Part No.SP-409-A)

Bosch – Super Plus (Copper Core) Spark Plug (Part No.F1000184876BOS)

NGK – Iridium IX Spark Plug: Single Iridium Fine Wire, TR5-1IX (Part No.7243)

NGK – Standard Spark Plug (Part No.F100037031NGK)

Autolite Iridium – Iridium XP Finewire Spark Plug: Improved Durability, More Focused Ignition (Part No.XP5145)

Motorcraft – Enhance Engine Performance with Reliable Spark Plug (Part No.SP-482-X)

Champion – Iridium Spark Plug: Maximum Performance, OE Replacement, RS14WLPB5 (Part No.9402)

Bosch – OE Finewire Platinum Spark Plug (Part No.F1000420685BOS)

Motorcraft – Original Equipment Copper Core Spark Plug (Part No.SP-429)

Worldpac – SPARK PLUG (Part No.F10004175353MTR)

NGK – G-Power Spark Plug: Single Platinum Tip Design, TR5-1GP (Part No.3716)

Champion – Platinum Power Spark Plug: Powerful Perfromance, OE Replacement, RS14ZPYC5 (Part No.3407)

DENSO – Standard U-Groove Spark Plug (Part No.F100036766ND)

Motorcraft – Original Equipment Copper Core Spark Plug (Part No.F1000194982MTR)

Motorcraft – SPARK PLUG (Part No.SP-409-AX)

Autolite – Copper Spark Plug: Delivers Quick Starts, Good Fuel Economy, Smooth Acceleration (Part No.2546)