2003 Mercury Grand Marquis Ignition and Tune-Up Products

Essential 2003 Mercury Grand Marquis Ignition and Tune-Up Products

Accel – Accel Ford 3 Vlv Mtr Coil Kit (Part No.140033-8)

Accel Ford 3 Vlv Mtr Coil Kit

from

$334.99
ACCEL Super Coils feature advanced bobbin technology, highly specialized silicon magnetic steel cores, optimized windings, proper resistance and engineered turn ratios that deliver a high performance, quality coil. Specialized high temperature epoxy resists shock and vibration, while increasing thermal conductivity. These are direct high performance replacements for OEM coils.

Product Features:
  • Specialized silicone magnetic steel cores are surrounded by precision wrapped windings using advanced bobbin technology which helps maintain the proper resistance and turn ratios necessary to deliver improved performance spark
  • Advanced Bobbin Technology
  • Direct Plug In Replacement results in a Direct OE Fit
  • OBD ll Safe, so you won’t be throwing codes, just sparks
  • Standard Motor Products SMP Fd-508
  • MSD 8243 82438
  • 8 Pack
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Accel – Ford 2 Valve Engine Performance Coil Kit (Part No.140032-8)

Ford 2 Valve Engine Performance Coil Kit

from

$199.99
ACCEL Super Coils feature advanced bobbin technology, highly specialized silicon magnetic steel cores, optimized windings, proper resistance and engineered turn ratios that deliver a high performance, quality coil. Specialized high temperature epoxy resists shock and vibration, while increasing thermal conductivity. These are direct high performance replacements for OEM coils.

Product Features:
  • Specialized silicone magnetic steel cores are surrounded by precision wrapped windings using advanced bobbin technology which helps maintain the proper resistance and turn ratios necessary to deliver improved performance spark
  • Advanced Bobbin Technology
  • Direct Plug In Replacement results in a Direct OE Fit
  • OBD ll Safe, so you won’t be throwing codes, just sparks
  • Standard Motor Products SMP Fd-503
  • MSD 8242 82428
  • 8 Pack
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Dorman – Ignition Pulsator Ring (Part No.917-060)

Ignition Pulsator Ring

from

$32.99
This ignition pulsator ring is designed to match the fit and function of the original ring on specified vehicles, and is engineered for durability and reliable performance.

Product Features:
  • Direct replacement – this ignition pulsator ring is designed to match the fit and function of the original ring on specified vehicles
  • Ideal solution – this ring is a reliable replacement for an original part that is damaged or has failed due to fatigue
  • Durable construction – this ring is 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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DENSO – Spark Plug Wire Set: Carbon Core, 9 Wire Set (Part No.671-8105)

Spark Plug Wire Set: Carbon Core, 9 Wire Set

from

$46.49
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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DENSO – Spark Plug Wire Set: Carbon Core, 8 Wire Set (Part No.671-8095)

Spark Plug Wire Set: Carbon Core, 8 Wire Set

from

$101.99
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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Motorcraft – Original Equipment (O.E.) Switch Assembly – Ignition (Part No.SW-5011)

Original Equipment (O.E.) Switch Assembly - Ignition

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$81.99
The only parts recommended by Ford Motor Company for Ford, Lincoln and Mercury vehicles.

Product Features:
  • Direct-fit, OE replacement parts – identical to factory installed parts. Robust design helps provide long operating life and excellent performance.
  • All OE switch functions are maintained. Factory connectors help ensure a solid, positive connection. Provided factory mounting points ensure easy installation – new gaskets and attaching hardware is included, where applicable.
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Motorcraft – Ignition Switch (Part No.M5050427791MTR)

Ignition Switch

from

$58.64
Ignition Switch

Motorcraft – Ignition Wire Set (Part No.F1020361172MTR)

Ignition Wire Set

from

$66.17
The Motorcraft Ignition wire set is a direct fit OEM replacement that guarantees the same performance and quality provided by the vehicle manufacturer.

Product Features:
  • OEM quality
  • OEM connectors for easy Installation.
  • Resistant to high temperatures, corrosion and vibration.
  • Ignition noise suppressed.
  • Reduces the chance of misfire
  • Increases engine life
  • Protects against wire set failure
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NGK – NGK Wire Set (Part No.52105)

NGK Wire Set

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$88.99
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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Carquest Premium – Ignition Coil Connector (Part No.PTC1111)

Ignition Coil Connector

from

$7.29
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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Carquest Premium – Ignition Coil Connector (Part No.PTA1175)

Ignition Coil Connector

from

$45.99
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.

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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DENSO – Spark Plug Wire Set: Carbon Core, 9 Wire Set (Part No.671-8094)

Spark Plug Wire Set: Carbon Core, 9 Wire Set

from

$65.99
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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MSD Ignition – Wire Set; Super Conductor; Ford 302; 351W; HEI (Part No.31329)

Wire Set; Super Conductor; Ford 302; 351W; HEI

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$109.99
The MSD 8.5mm super conductor wire is the performance wire. Engineered from the inside out, the 8.5 offers everything you have ever wanted in a wire; incredibly low resistance without electronic interference. In a single 12 inch length of super conductor wire there is only 40 – 50 ohms of resistance. That is the lowest resistance of any helically wound wire. To accomplish this, we use a copper alloy conductor due to it’s great voltage carrying capabilities. The low resistance results in less loss in spark energy so more reaches the spark plug. The conductor is wound extremely tight around a special center core. So tight in fact, that there is over 40 feet of conductor wrapped into a single foot of plug wire. This winding procedure, combined with a ferro-magnetic impregnated center core, produces an extremely effective electro magnetic interference (EMI) or choke. This choke, or suppression capability, keeps the EMI inside the wire where it cannot interfere with other electronics on your vehicle. The outer sleeve that surrounds the conductor assembly is just as impressive. A proprietary blend of silicone and synthetic material produce a sleeve that is highly resistant to high heat as well as abrasion and tears. Available in universal kits and bulk lengths.

Product Features:
  • Custom Fit For Make And Model Listed
  • Wires Are Pre-Cut To Exact Specifications
  • Bolt-on Performance
  • Conductor core features DuPont Kevlar material for increased tensile strength
  • 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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Dorman – Help – Ignition Cylinder Actuator (Part No.47510)

Ignition Cylinder Actuator

from

$25.99
This ignition switch actuator is designed to match the appearance and function of the original actuator on specified applications, and is engineered for reliable performance and durability.

Product Features:
  • Direct replacement – this ignition switch actuator is made to match the fit and performance of the original actuator on specific vehicle applications
  • Ideal solution – this actuator is a reliable replacement for an original part that has failed due to fatigue
  • Durable construction – this part is made from quality materials to ensure reliable performance and 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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Carquest Premium – Ignition Knock (Detonation) Sensor (Part No.SBC3679)

Ignition Knock (Detonation) Sensor

from

$33.99
MotoRad Knock Sensors respond to a wide range of engine knock frequencies providing accurate engine condition to the ECM for optimal ignition timing. Highest quality piezoceramic element manufactured to tight tolerances for increased durability. All MotoRad Knock Sensors are designed to meet or exceed OEM specifications at our ISO TS16949 manufacturing facilities.

Product Features:
  • Precision piezoceramic element ensures accurate response to a wide range of engine vibrations
  • Manufactured using the highest quality OEM materials to ensure optimal performance and rugged durability
  • Designed to meet or exceed all OEM specifications in fit, form & function
  • Extensive product testing includes salt spray, high/low temperature impact, thermal cycling, vibration, drop among other tests, to ensure all sensors meet or exceed OEM specifications.
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Carquest Premium – Ignition Knock (Detonation) Sensor (Part No.SBA3803)

Ignition Knock (Detonation) Sensor

from

$75.99
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.
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Accel – Ford 4-Twr.Dis Supercoil Pack (Part No.140018)

Ford 4-Twr.Dis Supercoil Pack

from

$116.99
Engineered to be the only true performance Ford 4-tower style EDIS coil. Advanced bobbin technology, highly specialized silicone magnetic steel core, optimized winding, resistance, and turns ratio result in higher energy and voltage outputs, and longer arc duration. Direct OEM replacement. Must use factory firing order. Compatible with Ford EDIS computer controlled ignition system as well as Crane or MSD capacitive discharged (CD) DIS ignition systems. Special high temperature epoxy resists shock and vibration, while increasing thermal conductivity. Secondary towers molded in high dielectric strength ACCEL Yellow. Packaged as single unit: 4 cyls require 1 coil pack, “”twin plug”” 4 cyls require 2 coil packs and 8 cyls require 2 coil packs. No tsuitable for some late 1999 applications.

Product Features:
  • 10-15% More Energy
  • Direct Plug In Replacement Direct OE Fit
  • Advanced Bobbin Technology
  • Highly Specialized Silicone Magnetic Steel Cores
  • Standard Motor Products SMP Fd-487
  • MSD 8241
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Carquest – Ignition Coil: Meets OE Specifications, 1 Count (Part No.26C1038)

Ignition Coil: Meets OE Specifications, 1 Count

from

$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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ACDelco – Copper Core Spark Plug: Original Equipment Replacement (Part No.R45TSX)

Copper Core Spark Plug: Original Equipment Replacement

from

$4.99
ACDelco Professional Conventional Spark Plugs are designed for reliability and efficient performance, and are a high quality replacement for many vehicles on the road today. Their high-quality copper cores and outstanding suppression characteristics deliver reliable performance. They are also available for Marine applications. These premium aftermarket replacement spark plugs are manufactured to meet your expectations for fit, form, and function.

Product Features:
  • Black Onyx coating helps reduce corrosion
  • Copper core provides great heat transfer and helps maximize plug durability
  • Ribbed suppressor seal extends resistance and helps prevent spark ‘flash over’ and misfires
  • Nickel-chrome alloy sheathing helps prevent corrosion on center electrode
  • Available for use in Marine applications
  • Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional
  • ACDelco GM Original Equipment parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
  • GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies
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Autolite – Racing Resistor Spark Plug: Enables Performance, Handles Intense Conditions (Part No.AR103)

Racing Resistor Spark Plug: Enables Performance, Handles Intense Conditions

from

$4.99
The ground electrode is cut-back from the center electrode to provide a gap, and its concave face ensures a constant gap to the center electrode. This design opens the spark face for better ignitability of the flame kernel and retains less heat, transferring it to the shell faster to reduce the risk of pre-ignition. Dyno testing has shown proven power gains, making it ideal for all aftermarket cylinder heads used in various racing venues, including oval and road racing. The cut-back ground electrode is an evolution from the practice of grinding back the side electrode, and it features a tapered seat type for optimal performance.

Product Features:
  • Opens spark face for better ignitability of flame kernel
  • Retains less heat, transfers heat to shell faster – reduces risk of pre-ignition
  • Dyno testing has shown proven power gains
  • Cut-back ground electrode evolved from practice of grinding back the side electrode
  • Optimal Performance: Features a tapered seat type for optimal performance in various racing venues, including oval and road racing.
  • Durable Design: Specifically designed to handle intense conditions, making it suitable for all aftermarket cylinder heads used in racing.
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E3 – High Output Ford 2-Valve Coil (Part No.E3.624)

High Output Ford 2-Valve Coil

from

$29.99
With more than double the energy output of a stock coil, E3s new 2 Valve coil features a stainless steel spark plug contact ring with a ferrite lug to suppress EMI/ RFI noise. Designed to work with the factory DIS electronic controls as well as high performance aftermarket ignition systems, the resistance and inductance values have been optimized to increase output at high RPM levels. Our high temperature epoxy resists shock and vibration while providing excellent thermal conductivity ensuring extra long life. Additionally, the spark plug boots are molded in a special high temperature 550 degree F silicone compound. Fits the 1997 to 2013 2 Valve Ford engines.

Product Features:
  • Designed to work with factory DIS electronic ignition systems
  • High temperature epoxy provides excellent thermal conductivity and long life
  • Stainless steel spark plug contact ring and optimized resistance and inductance provide high output at higher RPM levels
  • Fits 1997-2013 2-Valve Ford engines
  • Crosses to MSD 8248
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Carquest Premium – Ignition Switch Connector (Part No.PTA1283)

Ignition Switch Connector

from

$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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Carquest Premium – Ignition Switch Connector (Part No.PTA1318)

Ignition Switch Connector

from

$19.99
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.

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

8Mm Super Stock Spiral Uni Bk

from

$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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Carquest Premium – Spark Plug Wire Set: 8 Wires, Increased performance, Designed for direct fit (Part No.35-8187)

Spark Plug Wire Set: 8 Wires, Increased performance, Designed for direct fit

from

$77.99
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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NGK – Coil on Plug Boot (Part No.58901)

Coil on Plug Boot

from

$6.79
NGK Coil on Plug Boots are built to stringent OEM tolerances, combining original equipment fit, design and outstanding durability. NGK Coil on Plug Boots are manufactured using only premium silicone and always include any required internal springs and ferrite resistors for superior performance and RFI noise suppression. Bridging the important link between ignition coil and spark plug, COP boots should always be replaced with NGK Coil on Plug Boots at the time as changing spark plugs to prevent ignition problems such as flashover.

Product Features:
  • PREMIUM GRADE SILICONE: Designed to withstand harsh environments
  • OEM MATCHED: Includes all required internal springs and ferrite resistors for superior performance and RFI noise suppression
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Accel – Universal Fit Super Stock 8mm Suppression; Spark Plug Wire Set (Part No.4040K)

Universal Fit Super Stock 8mm Suppression; Spark Plug Wire Set

from

$65.99
These ACCEL wire sets are a true performance upgrade replacement for OE types. Efficient delivery of spark energy for a good price. Silicone boots with black wire contain zinc-plated steel terminals. Noise suppression core. Set contains 8 plug wires with coil lead.

Product Features:
  • 7mm And 8mm High Gloss Silicone Jacket
  • 450° F Rated Silicone Jacket
  • Stainless Steel Plug Terminals
  • RFI Suppression For Street Driven Applications
  • Custom-fit Universal And Import Coverage
  • High-strength Fiberglass Braid Construction
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MSD Ignition – Wire Set; Street Fire; Ford 351W; 400; 460; HEI; 77-on (Part No.5540)

Wire Set; Street Fire; Ford 351W; 400; 460; HEI; 77-on

from

$72.99
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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2003 Mercury Grand Marquis Ignition and Tune-Up Products

You count on your 2003 Mercury Grand Marquis to run right. That means taking care of it with regular maintenance, necessary repairs, and the right parts. Advance Auto Parts can help with all of that thanks to our extensive inventory of trusted Ignition and Tune-Up Products. With 64 Ignition and Tune-Up Products ranging in price from $2.99 to $330.99, you’re sure to find everything you need for your 2003 Mercury Grand Marquis.

Brands matter. If you want to shop a specific Ignition and Tune-Up Products brand, we stock 16 different brands like NGK, Autolite, and Motorcraft. 2003 Mercury Grand Marquis Ignition and Tune-Up Products start as low as $2.99!

One of the best ways to find top quality OEM or aftermarket Ignition and Tune-Up Products is by asking professionals. Short of that, you can shop with confidence thanks to our 6,356 extensive product reviews on 2003 Mercury Grand Marquis Ignition and Tune-Up Products. Some of the top-rated Ignition and Tune-Up Products products we carry are Ignition Coil with 4.7 stars and Ignition Coil: Meets or Exceeds Original Equipment Specifications, 1 Piece with 4.7 stars.

Did we mention you can order your Ignition and Tune-Up Products from our online catalog and have them shipped right to your garage? Or, if you feel like seeing the parts first-hand, search for your nearest Advance Auto Parts location above and pick up in-store when you’re ready. Browse our full Ignition and Tune-Up Products inventory for your 2003 Mercury Grand Marquis below to get started!

Top-Rated Ignition and Tune-Up Products Brands For Your 2003 Mercury Grand Marquis

Trusted Ignition and Tune-Up Products OEM and aftermarket product brands are what Advance Auto Parts specializes in. The brands we work with are sure to keep that 2003 Mercury Grand Marquis running right for years to come. In our inventory you’ll find brands like NGK, Autolite, Motorcraft, and even more.

Popular Autolite Ignition and Tune-Up Products

You’ll find popular Autolite brand products across Spark Plugs. All are waiting to get your 2003 Mercury Grand Marquis back on the road. Some of the top-rated Autolite products in these categories are:

Top-Rated NGK Ignition and Tune-Up Products


If NGK are what you’re looking for, our inventory holds plenty. We stock NGK brand Ignition and Tune-Up Products for your 2003 Mercury Grand Marquis, and some of our most reviewed NGK parts include:

FAQs for 2003 Mercury Grand Marquis Ignition and Tune-Up Products

What are the most purchased Ignition and Tune-Up Products for the 2003 Mercury Grand Marquis?

Out of 64 Ignition and Tune-Up Products for the 2003 Mercury Grand Marquis, the most popular in our inventory are:
Iridium XP Finewire Spark Plug: Improved Durability, More Focused Ignition
from $9.99
This product is not rated
Iridium XP Finewire Spark Plug: Improved Durability, More Focused Ignition
Spark Plugs

What are the top-rated 2003 Mercury Grand Marquis Ignition and Tune-Up Products?

Top-rated Ignition and Tune-Up Products for your 2003 Mercury Grand Marquis based on customer reviews/ratings are:
Ignition Coil
from $59.05
(175)
Ignition Coil
“Good fit , so far so good”
Ignition Coil: Meets or Exceeds Original Equipment Specifications, 1 Piece
from $80.99
(118)
Ignition Coil: Meets or Exceeds Original Equipment Specifications, 1 Piece
“Easy to install and was exact match to my 2001 Expedition. Cons: High price$$, only replaced one ignition coil. If had to replace all eight would”
PT16TT Platinum TT Spark Plug
from $5.99
(90)
PT16TT Platinum TT Spark Plug
“On line”