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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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

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1 Answer

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