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Mercury Grand Marquis Spark Plug

We have 9 Items In-stock. Select a year to continue.
$4.26 List Price $5.03 Save $0.77 Availability: In Stock
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NGK TR55GP G-POWER PLATINUM SPARK PLUG, SOLD INDIVIDUALLY

NGK G-Power Spark Plug is a world class design that gives better fuel efficiency, lower emissions, and quicker starts.

Specifications:
  • 14 mm thread size
  • 17.55 mm reach
  • 16 mm hex size
  • 0.06 in. gap size
  • Tapered seat style
  • Resistor plug type
  • Projected tip
  • Solid terminal nut
  • Platinum tipped center electrode
  • Trapezoid beveled cut ground electrode

Features:
  • Extremely durable under high heat
  • Trivalent metal plating offers superior anti-corrosion and anti-seizing properties


  • SKU#: NG3403
  • Brand: NGK
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Anticipated Ship Out Time: 1-2 Business Days
  • Electrode Tip Material: Platinum
  • Gap Size: 1.5 mm
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Fits the following Mercury Grand Marquis Years:
  • 1992-2011 | 8 Cyl 4.6L | LS
  • 1992-2008 | 8 Cyl 4.6L | GS
(see more)
Rating: (see review/s)

"Great experience, ease of ordering, shippedon time, great product and reasonablely priced." posted by: Len on December 5, 2009

"Not much to say about spark plugs except my engine (Ford OHV 3.0 Taurus) is purring away after I installed these and the Bosch Wire Set I got with it." posted by: Fixinmyfordagain on September 26, 2009 view all 2 reviews

$12.07 List Price $14.24 Save $2.17 Availability: In Stock
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DENSO PREMIUM CLASS IRIDIUM SPARK PLUG

Denso's Premium Class Iridium Spark Plugs is fast becoming the standard for today's high-tech engines. Employing a revolutionary 360 degrees laser welding process, Denso has created a spark plug unlike anything on the market today. Designed for durability under the most extreme conditions. Denso's patented Iridium alloy is 6 times harder and 8 times stronger than conventional platinum and can handle temperatures in excess of 4,000 degrees Fahrenheit.

Specification:
  • 14 mm thread size
  • 18 mm reach
  • 0.63 in. hex size
  • 0.04 in. gap size
  • Tapered seat style
  • Resistor plug type
  • 0.4 mm iridium center electrode
  • Tapered cut U-groove ground electrode
  • Removable terminal
  • Heat range 16

Features:
  • Designed with heavy duty insulator that provides unparalleled dielectric strength and thermal conductivity under extreme temperatures
  • Five-rib design prevents flashover while decreasing voltage loss
  • Copper glass seal bonds the center electrode and insulator together for a gas-tight seal
  • Platinum center electrode utilizes platinum to shrink the surface area of the center electrode tip for maximum firing performance and minimum voltage requirements
  • Platinum ground electrode resists gas and electrical erosion and corrosion extending service intervals to 60,000 miles


  • SKU#: NPIT16
  • Brand: Denso
  • Electrode Core Material: Iridium
  • Plug Type: Resistor
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Platinum
  • Gap Size: 1.1 mm
(see more)
Fits the following Mercury Grand Marquis Years:
  • 2006-2010 | 8 Cyl 4.6L | LS
  • 2006-2008 | 8 Cyl 4.6L | GS
(see more)
$6.62 List Price $7.81 Save $1.19 Availability: In Stock
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BOSCH PREMIUM CLASS PLATINUM+4 SPARK PLUG

Bosch Premium Class Platinum+4 Spark Plug contains the most platinum in the Bosch Platinum Plug Series and has a unique firing technology that combines the advantages of surface air gap technology and 4 yttrium enhanced ground electrodes.

Specifications:
  • 14 mm thread size
  • 17.55 mm reach
  • 16 mm hex size
  • Platinum plug
  • Tapered seat style
  • Interference suppression resistor
  • Surface air gap plug
  • Heat fused platinum center electrode
  • 4 ground electrodes
  • Heat range 8

Features:
  • Reduces the voltage necessary to jump the gap as well as quenching
  • Provides multiple radial spark paths and surface air gap design that creates optimal exposure of the air/fuel mixture to the enhanced ignition spark
  • Yttrium-enhancement of the ground electrodes further extend plug life
  • Designed to reach self cleaning temperature faster for quicker starts, smoother acceleration, and increased fuel efficiency
  • SKU#: BS4458
  • Brand: Bosch
  • Electrode Core Material: Platinum
  • Plug Type: Resistor
  • Anticipated Ship Out Time: 1-2 Business Days
  • Electrode Tip Material: Platinum
  • Reach: 17.55 mm
(see more)
Fits the following Mercury Grand Marquis Years:
  • 2009 | 8 Cyl 4.6L | LS
  • 2006-2008 | 8 Cyl 4.6L | GS, LS
Rating: (see review/s)

"I noticed instant power increase for my Ford Ranger with a 3.0 liter V6." posted by: on December 22, 2013

"After several hours to install and using these plugs I am sorry I tried them the vehicle lugs under load and the gas mileage dropped 5 miles per gallon and you know this 4.2 liter ford does not get good mileage in the first place.. DO NOT WASTE YOUR TIME AND MONEY.. THEY WILL CHANGED SOON. i DID GIVE THEM A CHANCE SEVERAL THOUSAND MILES OF DIFFERING DRIVING.. USELESS" posted by: grumpy on June 17, 2012 view all 2 reviews

$5.94 List Price $7.01 Save $1.07 Availability: In Stock
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AC DELCO SPARK PLUG ASSEMBLY, SOLD INDIVIDUALLY -- Constructed from top quality materials to help the engine run clean and longer; Features a copper-core center electrode for improved heat transfer to the tip; Hot-tip insulators heats fast and fires hot to promote longer electrode life for miles of dependable performance; Nickel-chrome alloy sheathing on the ground and center electrodes offers maximum resistance against wear from spark erosion and the corrosive environment of the combustion chamber; Engineered to high standards and tested under extreme conditions to exceed OE specifications; Replaces OE number 25171347.
  • SKU#: AC8
  • Brand: AC Delco
  • Fit Note: Car
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Platinum
  • Gap Size: OE Replacement
(see more)
Fits the following Mercury Grand Marquis Years:
  • 1992-2004 | 8 Cyl 4.6L | GS, LS
  • 1996 | 8 Cyl 4.6L | GS, LS
$9.05 List Price $10.68 Save $1.63 Availability: In Stock
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PULSTAR PLATINUM PULSE SPARK PLUG, SOLD INDIVIDUALLY

Pulstar Pulse Spark Plug contains integrated electrical capacitor that focuses on the energy of the plug. Its electrical energy delivers the fuel mixture far beyond the typical conventional spark plugs and produces not only better fuel efficiency, but also increased torque and horsepower.

Specifications:
  • 14 mm thread size
  • 18 mm reach
  • 16 mm hex size
  • 1.14 mm gap
  • 0.9 mm platinum tipped center electrode with copper core
  • Tapered seat
  • Resistor
  • Nickel alloy ground electrode

Features:
  • Latest Eco-Friendly ignition technology
  • Provides more horsepower, livelier throttle response, and up to 10 percent better fuel economy than conventional spark plugs
  • Allows more efficient burning of and generates a much larger spark than that of ordinary spark plugs
  • Reduces carbon dioxide emissions and provides cleaner exhaust through more efficient combustion
  • Uses an internal circuit that delivers up to 1,000,000 watts of peak power that increases peak spark current by up to 20,000 times that of a traditional spark plug


  • SKU#: AD1P
  • Brand: Pulstar
  • Fit Note: 0.9 mm Platinum Tipped Center Electrode With Copper Core, 18 mm Reach
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Anticipated Ship Out Time: 1-2 Business Days
  • Electrode Tip Material: Platinum
  • Gap Size: 1.14 mm
(see more)
Fits the following Mercury Grand Marquis Years:
  • 2011 | 8 Cyl 4.6L | LS
Rating: (see review/s)

"I really like the technology that is put into these plugs. I have noticed a small increase in gas mileage though i dreve a 2500hd silverado with the 6.0L so its hard to increase mileage a lot. I have noticed smoother running and better acceleration. Great product." posted by: on January 19, 2011

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$7.64 List Price $9.02 Save $1.38 Availability: In Stock
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MOTORCRAFT SUPPRESSOR SPARK PLUG, NICKEL, SOLD INDIVIDUALLY

0.054 in. gap size, alternative plug; Delivers maximum voltage to the spark plug while maximizing performance and increases engine life; Resists corrosion and abrasion; Reduces the chance of misfire.


  • SKU#: MISP413
  • Brand: Motorcraft
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Anticipated Ship Out Time: Same day - 1 business day
  • Warranty: 12-month or 12,000-mile Motorcraft limited warranty
 
Fits the following Mercury Grand Marquis Years:
  • 2006-2008 | 8 Cyl 4.6L | GS, LS
  • 2005 | 8 Cyl 4.6L | GSL, Limited Edition, Ultimate Edition
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$9.49 List Price $11.20 Save $1.71 Availability: In Stock
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CHAMPION DOUBLE PLATINUM SPARK PLUG, SOLD INDIVIDUALLY

Champion Double Platinum Power Spark Plugs use a fine-wire and V-trimmed center electrode to create a sharper spark focus than conventional plugs. With their exclusive Heat-Active alloy, they are designed to reach operating temperatures quickly and maintain stable temperatures under varying engine loads. It is widely designed for distributorless ignition systems, these Champion Double Platinum Power spark plugs can maximize fuel efficiency and spark energy.

Specifications:
  • 14 mm thread diameter
  • platinum tipped ground electrode
  • platinum tipped center electrode
  • Projected core nose
  • Heat range 14

Features:
  • Platinum tipped for superior erosion resistance and spark for better performance
  • Engineered with triple sealed interior and copper core to reduce failure from heat and stress


  • SKU#: C337940
  • Brand: Champion
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Anticipated Ship Out Time: Same day - 1 business day
  • Electrode Tip Material: Platinum
  • Reach: 14 mm
(see more)
Fits the following Mercury Grand Marquis Years:
  • 1992-1995 | 8 Cyl 4.6L | GS, LS
$22.49 List Price $26.54 Save $4.05 Availability: In Stock
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ACCEL SILVER TIP SERIES SPARK PLUG, SOLD INDIVIDUALLY

Accel Silver Tip Series Spark Plug is constructed with silver material which is the best electrical conductor that allows a wider heat range and is extremely resistant to fouling.

Specifications:
  • 14 mm thread size
  • 0.71 in. reach
  • 0.63 in. wrench diameter
  • Tapered seat style
  • Shorty spark plug
  • Resistor plug type
  • Silver electrode core/tip material
  • Projected insulator type
  • One ground strap
  • Heat range 6

Features:
  • Silver center electrode with low ignition voltage requirements that allows easier starting and fine wire center electrode which allows a thicker insulator to help prevent arcing
  • Offers all the benefits of Accel shorty plugs along with the benefits of the silver tip plugs

Can be used with LPG, E85, methanol/ethanol, injection, high compression, and high RPM engines. One step colder than standard heat range.

  • SKU#: A35256SS
  • Brand: Accel
  • Electrode Core Material: Silver
  • Plug Type: Resistor
  • Anticipated Ship Out Time: 1-2 Business Days
  • Electrode Tip Material: Silver
  • Reach: 0.71 in.
(see more)
Fits the following Mercury Grand Marquis Years:
  • 1992-1995 | All Engines | All Submodels
$5.95 List Price $8.99 Save $3.04 Availability: In Stock
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E3 DIAMONDFIRE SPARK PLUG, SOLD INDIVIDUALLY -- 14 mm thread size, 17.52 mm reach, 0.62 in. hex size, tapered seat, resistor, 1.5 mm non-adjustable gap size, copper core electrode material, nickel alloy electrode tip material, projected insulator type; Guaranteed to provide more power while using less fuel, quicker starts and less fouling than competitive standard spark plugs.
  • SKU#: PYRE362
  • Brand: E3
  • Electrode Core Material: Copper
  • Plug Type: Resistor
  • Product Class: Fuel saver
  • Anticipated Ship Out Time: 1-2 Business Days
  • Electrode Tip Material: Nickel alloy
(see more)
Fits the following Mercury Grand Marquis Years:
  • 1992-2009 | 8 Cyl 4.6L | LS
  • 1992-2008 | 8 Cyl 4.6L | GS
(see more)
Rating: (see review/s)

"I replaced 4 original spark plugs with E3s. Car ran well for 57 miles then picked up a misfire. I checked everything but the spark plugs trying to figure out what was wrong. I had changed plug wires and coil pack at the same time. After exhausting all else I pulled the brand new plugs only to discover the #4 plug was not firing properly. Replaced it and the car is fine. All plugs will be replaced now! I have never had a brand new plug short out in my 45 years of working on my own cars." posted by: Jim on October 3, 2011

"dont recommend in a 1999 chevy cavalier 2.4 l. they make the engine misfire. had to change back to the good old double platinum and the misfires stopped." posted by: on January 22, 2011 view all 5 reviews

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