Question about 2004 GMC Envoy

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Where are the spark plugs on a 2004 envoy

I need to service my engine but i dont know where the spark plugs are located

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The plugs are accessible from the top of the engine, there is an individual coil pack over top of each spark plug (they are kinda egg shaped and they have a little heat sink in them) just pull these out and below you will find the spark plug. you may have to remove the air intake to gain access to them.

Posted on Nov 02, 2008

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Attached is a diagram of where the plugs and coilpacks are located, you need to remove the air intake resonator box to access this area. Plugs should be changed around 100K miles. Use only AC Delco 41-103 Iridium plugs. #1 is the coilpack and #5 is the spark plug



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1 Answer

Where are the spark plugs located on a 2004 GMC Envoy?


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If you have a 4.2 L engine, Remove the 10mm bolts on the coils, on top of the engine, remove the electrical connector then the coil, your truck has individual coils, spark plugs are in the hole, 5/8 spark plug socket, don't buy cheap spark pluggs for this truck, it will miss fire, I prefer autolites Autolite Xp Iridium/Spark Plug

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2 Answers

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Hello erikkaloves,

The spark plugs are under the coils. To get to them you must remove the plastic cowling from the top of the engine. Then you will see the coils, there will be six coils, one for each cylinder each looks the same with an aluminum heat sink on the top. These are removed by removing and the retaining the screw and wires.

Once removed the spark plugs can be access but before you remove the spark plugs make sure the spark plug well is clear of foreign material. Dirt or debris in the spark plug well can fall into the engine and cause damage.

Regards,
netvan

Feb 23, 2011 | 2004 GMC Envoy

1 Answer

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Assuming you are talking about the 6 cylinder engine, the spark plugs are under a cover on top of the engine. There is a coil pack on top of each spark plug, the plugs are recessed in the valve cover.

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