Question about 2002 GMC Envoy

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There is oil in the coil packs. we are trying 2 change the plugs and they are 100% full of oil

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The valve cover gaskets need to be changed. there are rubber grommets that keep oil out of the spark plug holes that dry out and harden with age. Replace gasket and grommets and oil will stay out.

Posted on Oct 24, 2010


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Oil on coil packs and within the spark plug. When taking out the coil pack I can see oil coming from top going down into the spark plug chamber

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take the 4 torc screws out of each coil pack.

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Change them the same way u would pull any other plug.

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