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2004 GMC Envoy Spark Plug - Engine Electrical
Trivalent metal plating offers superior anti-corrosion and anti-seizing properties; Resistor plug type.
  • NGK
  • NGK G-Power
  • Sold Individually
Price: $3.28


6 Cyl 4.2L XL SLE, XL SLT, SLE, SLT, XUV SLE, XUV SLT
1998 GMC P3500 Spark Plug - Engine Electrical
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Five-rib design prevents flashover while decreasing voltage loss; Designed with heavy duty insulator that provides unparalleled dielectric strength and thermal conductivity under extreme temperatures.
  • Denso
  • Denso Double Platinum
  • Sold Individually
Price: $8.92


6 Cyl 4.3L Base
8 Cyl 5.7L Base
8 Cyl 7.4L Base
E3 DIAMONDFIRE SPARK PLUG, SOLD INDIVIDUALLY -- 14 mm thread size, 17.52 mm reach, 0.62 in. hex size, tapered seat, resistor, 1.016 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.
  • E3
  • E3 DiamondFire
  • Sold Individually
Price: $5.95


8 Cyl 4.8L SLE, SL, WT
8 Cyl 5.3L SLE, SLT, SL, WT, XFE
8 Cyl 6.0L Hybrid
8 Cyl 6.2L SLT, SLE
2003 GMC Sonoma Spark Plug - Engine Electrical
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Delivers maximum voltage to the spark plug while maximizing performance and increases engine life; MOTORCRAFT SUPPRESSOR SPARK PLUG, FINEWIRE PLATINUM, SOLD INDIVIDUALLY 0.05 in. gap size, standard service plug.
  • Motorcraft
  • Motorcraft Suppressor
  • Direct OE Replacement
  • Sold Individually
Price: $5.87


4 Cyl 2.2L SL, SLS
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Engineered to high standards and tested under extreme conditions to exceed OE specifications; Constructed from top quality materials to help the engine run clean and longer.
  • AC Delco
  • AC Delco Professional Platinum
  • Sold Individually
Price: $10.62


8 Cyl 4.8L Base
8 Cyl 6.0L Base, LS, LT, SL, SLE
A Spark Plug is an electrical device that sets through the cylinder head of some internal combustion engines. This is responsible for the ignition of the compressed aerosol gasoline by producing electric sparks. Electricity is driven by the spark plug to arc across one gap that seems to be the bolt of lightning. At extremely high voltage, this electricity flows across the gap and creates a good spark. The voltage at the spark plug can drive from 40,000 to 100,000 volts.

The high voltage necessarily travels down the electrode. Thus, an insulated passageway must be provided for the spark plug. This will allow the voltage to jump the gap and conduct into the engine block. Your GMC spark plug should withstand the extreme heat and pressure inside the cylinder. This must be designed in such a way that scaling from fuel additives will not occur. There are useful device, known as Ceramic insert, which is intended to isolate the high voltage at the electrode in the spark plug. This is capable of ensuring that the spark drives at the tip of the electrode and not anywhere else on the plug. Ceramic insert works double-duty while burning off deposits. It is a conductor that makes the material hot during operation. Such heat is necessarily used in the electrode to burn off deposits.

A hot plug is sometimes required in some vehicles. It is composed of a ceramic insert that faintly comes in contact with the metal portion of the plug. Such plug is used to reduce heat transfer from the ceramic. The objective behind this is to burn more deposits. A cold plug, on the other hand, is designed at larger contact area so that it would run cooler.

The right temperature plug is oftentimes set by manufacturers for certain vehicles. Some vehicles have high-performance engines that naturally generate more heat that's why they employ colder plugs. When the spark plug goes hot, it would ignite the fuel before the spark finally fires. The manufacturers are the first ones to know the most appropriate spark plugs for their vehicles, thus you must always consider the unit that fits the manufacturer's given specifications. This will help you sustain the excellent performance in your ignition system.

Various GMC Spark Plugs are available here at Parts Train. Check out our comprehensive catalog for your hassle free search. We guarantee all auto and truck parts and accessories that we have in stock are highly dependable and 100% new. Call Parts Train's friendly personnel for your particular queries about your most preferred GMC Spark plugs.

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