1978 Mercury Grand Marquis Spark Plugs
More 1978 Mercury Grand Marquis Spark Plugs
Find your specific 1978 Mercury Grand Marquis original or aftermarket Spark Plugs below. Order your parts online and have delivered to your home or pick up in-store at Advance Auto.
Essential 1978 Mercury Grand Marquis Spark Plugs
NGK – G-Power Spark Plug: Single Platinum Tip Design, UR4GP (Part No.2869)
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$6.29
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.
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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
- Trapezoidal Cut Ground Electrode: Improves fuel efficiency, lowers emissions, and provides faster starts and quicker acceleration.
- Economical Upgrade: Ideal for vehicles originally equipped with nickel alloy spark plugs, offering a cost-effective performance boost.
- Enhanced Durability: Designed to last longer than traditional nickel spark plugs, reducing the need for frequent replacements.
DENSO – Iridium TT Spark Plug: Ultimate Endurance and Power, 0.4mm Iridium Tip, last 100K+ Miles, ITF20TT (Part No.4716)
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$12.99
Durability of an OE style plug combined with Power & Torque of high performance.
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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
Autolite Iridium – Iridium XP Finewire Spark Plug: Improved Durability, More Focused Ignition (Part No.XP25)
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$9.99
Our best spark plug! Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Designed and engineered in the USA, the Autolite Iridium XP spark plugs feature an iridium-enhanced 0.6mm finewire design and patented platinum sidewire technology to provide better overall durability and a more focused ignition for enhanced ignitability and performance. Features double Iridium-enhanced alloy technology center electrode for improved durability and wear resistance.
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Product Features:
- 0.6 mm finewire design improves ignitability
- Patented V-trimmed platinum sidewire technology resists wear
- OE equivalent design is engineered for every engine
- Designed for better overall durability with virtually no gap erosion
Champion – Iridium Spark Plug: Maximum Performance, OE Replacement, RS14WLPB5 (Part No.9402)
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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.
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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
Motorcraft – High-Performance Spark Plug: Enhances Fuel Efficiency (Part No.SP-450-X)
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$6.49
Engineered for superior ignition performance, the Motorcraft High-Performance Spark Plug is designed to optimize fuel efficiency and ensure reliable starts. Crafted with precision, this spark plug offers exceptional durability and consistent performance, making it an ideal choice for maintaining your vehicle’s peak performance. Trust Motorcraft for quality and dependability in every drive.
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Product Features:
- Enhances Fuel Efficiency: Designed to optimize fuel consumption, ensuring you get the most out of every gallon.
- Superior Ignition Performance: Engineered for reliable starts and consistent performance, providing peace of mind on every drive.
- Exceptional Durability: Crafted with precision to withstand the demands of high-performance engines, ensuring long-lasting use.
- Consistent Performance: Maintains your vehicle’s peak performance, making it an ideal choice for regular maintenance.
- Quality and Dependability: Trust Motorcraft for high-quality spark plugs that deliver dependable performance in every drive.
- Enhances Fuel Efficiency: Designed to optimize fuel consumption, ensuring you get the most out of every gallon.
- Superior Ignition Performance: Engineered for reliable starts and consistent performance, providing peace of mind on every drive.
- Exceptional Durability: Crafted with precision to withstand the demands of high-performance engines, ensuring long-lasting use.
- Consistent Performance: Maintains your vehicle’s peak performance, making it an ideal choice for regular maintenance.
- Quality and Dependability: Trust Motorcraft for high-quality spark plugs that deliver dependable performance in every drive.
Autolite Iridium – Iridium XP Finewire Spark Plug: Improved Durability, More Focused Ignition (Part No.XP103)
from
$9.99
Our best spark plug! Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Designed and engineered in the USA, the Autolite Iridium XP spark plugs feature an iridium-enhanced 0.6mm finewire design and patented platinum sidewire technology to provide better overall durability and a more focused ignition for enhanced ignitability and performance. Features double Iridium-enhanced alloy technology center electrode for improved durability and wear resistance.
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Product Features:
- 0.6 mm finewire design improves ignitability
- Patented V-trimmed platinum sidewire technology resists wear
- OE equivalent design is engineered for every engine
- Designed for better overall durability with virtually no gap erosion
Motorcraft – Double Platinum Spark Plug: Enhanced Durability & Fuel Efficiency (Part No.SP-405)
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$6.49
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 provide enhanced 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 offer service intervals of up to 100,000 miles and help prevent false check engine lights, making them a reliable choice for almost any application.
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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 feature a platinum center and ground electrode tip, providing resistance to oxidation and arc erosion for long-lasting performance.
Autolite Iridium – Iridium XP Finewire Spark Plug: Improved Durability, More Focused Ignition (Part No.XP26)
from
$9.99
Our best spark plug! Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Designed and engineered in the USA, the Autolite Iridium XP spark plugs feature an iridium-enhanced 0.6mm finewire design and patented platinum sidewire technology to provide better overall durability and a more focused ignition for enhanced ignitability and performance. Features double Iridium-enhanced alloy technology center electrode for improved durability and wear resistance.
Product Features:
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Product Features:
- 0.6 mm finewire design improves ignitability
- Patented V-trimmed platinum sidewire technology resists wear
- OE equivalent design is engineered for every engine
- Designed for better overall durability with virtually no gap erosion
Champion – Copper Plus Spark Plug: Dependable Performance, OE Replacement, RS14LC (Part No.407)
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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.
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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
Dorman – Help – Spark Plug Non-Foulers – 14mm Tapered Seat (Part No.42006)
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$6.99
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.
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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
MSD Ignition – Wire Set; Super Conductor; Multi-Angle Plug; HEI Cap (Part No.31189)
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$129.99
For engines with late-model type (HEI spark plug top) distributor caps. Multi-angle boots and terminals installed on one end. 90 degree distributor boots and terminals included.
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Product Features:
- Extra Long 8.5mm Wires So You Can Cut To Your Designed Length
- Distributor Cap – Boots and Terminals Included
- Includes Mini-Stripper-Crimper For Factory Style Crimps
- Size Includes [8] 90 Degree Boots/Terminal Ends
- 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
Accel – 8.8Mm Spiral Universal Fit (Part No.8033)
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$153.99
These ACCEL 8.8mm wires feature a carbon/graphite core that virtually eliminate RFI noise while providing maximum conductivity for ultimate performance in any race or street application. Double silicon insulation eliminates leakage and misfire.
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Product Features:
- 500 Ohms/ft Of Resistance
- 550 F Rated Silicone Jacket
- Stainless Steel Plug Terminals
- Custom-fit Universal And Import Coverage
- Pre And Post HEI Vehicles
- Magnetic Suppression
- Fiberglass/Kevlar Core
- 500 Ohms Resistance
MSD Ignition – Wire Set; Super Conductor; 8-cyl. Multi-Angle Plug; Socket/HEI (Part No.31199)
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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:
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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
Popular 1978 Mercury Grand Marquis Spark Plugs Categories
1978 Mercury Grand Marquis Spark Plugs
Maybe you’re in the middle of a full rebuild of that 1978 Mercury Grand Marquis. Maybe you just need a couple of Spark Plugs. Either way, Advance Auto Parts has 28 different Spark Plugs in our inventory ranging from $2.79 to $153.99. That means you can find the exact parts or products you need to keep that 1978 Mercury Grand Marquis running smoothly.
Spark Plugs are only as good as their brand. We stock 10 different brands to make sure you have plenty of trusted parts to choose from for your 1978 Mercury Grand Marquis. ACDelco, NGK, and E3 are just some of the brands we stock. Search for brands you know or compare prices and reviews to help you decide!
We know you’ll find the perfect Spark Plugs for your 1978 Mercury Grand Marquis, but don’t take our word for it – read our customer ratings and reviews and buy with confidence. Out of the 1,159 reviews in this category, some of the top rated parts include High-Performance Shorty Spark Plugs for Header Clearance with 4.9 stars and Platinum Spark Plug: Fires Cleaner, Easier Starts, Quicker Acceleration with 4.5 stars.
So if you’re in the market for aftermarket Spark Plugs to keep your 1978 Mercury Grand Marquis rolling for years to come, look no further. Shop online and have your products shipped direct to your door, or pick up at the nearest Advance Auto Parts location today!
Spark Plugs Brands To Make Your 1978 Mercury Grand Marquis Last
Simple repair, complete replacement, or a full rebuild. No matter the job, your 1978 Mercury Grand Marquis demands trusted brand parts and products to keep it running. Many trusted brands of Spark Plugs make up Advance Auto Parts’ inventory, and all are ready to help make your Grand Marquis the best it can be. Be sure to browse some of our top Spark Plugs brands and parts.
Popular Champion Spark Plugs
We carry Champion parts in our stock across Spark Plugs categories, plus more. For a 1978 Mercury Grand Marquis, our most popular Champion Spark Plugs include:
Top 1978 Mercury Grand Marquis Spark Plugs from E3
E3 products are another trusted brand when it comes to Spark Plugs for your 1978 Mercury Grand Marquis. Popular E3 parts include:
FAQs for 1978 Mercury Grand Marquis Spark Plugs
What are the most purchased Spark Plugs for the 1978 Mercury Grand Marquis?
Out of 28 Spark Plugs for the 1978 Mercury Grand Marquis, the most popular in our inventory are:
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$3.49
(16)
Copper Spark Plug: Delivers Quick Starts, Good Fuel Economy, Smooth Acceleration
Spark Plugs
What are the top-rated 1978 Mercury Grand Marquis Spark Plugs?
Top-rated Spark Plugs for your 1978 Mercury Grand Marquis based on customer reviews/ratings are:
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$52.99
(36)
High-Performance Shorty Spark Plugs for Header Clearance
“Perfect great plugs for my Build. Great service to THANK YOU!”
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$4.79
(10)
Platinum Spark Plug: Fires Cleaner, Easier Starts, Quicker Acceleration
“Perfect fit”
