I just changed the plugs on our '04 Chevy Colorado. The engine is a straight 5 cylinder w/coils on plugs. 3 of the plugs that I took out had plenty of motor oil on the threads (not the electrodes,) and 2 were dry. I've never seen this before and it definitely makes me wonder what's going on. Feedback is much appreciated. Thanks.
Oil on spark plug threads????
- Thread starter edweather
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Start by checking for a valve cover gasket leak.
It may be the valve cover gasket plug well seals.
Don't suprise me, being a GM.
Originally Posted By: Troy_Built
Don't suprise me, being a GM.
Ouch
Don't suprise me, being a GM.
Ouch
most likely the spark plugs seals
common for the gasket to brittle due to age and many heat cycles.
make sure when you're reinstalling the spark plugs to torque it to spec, you don't want to expand/strip the head's spark plug threading.
common for the gasket to brittle due to age and many heat cycles.
make sure when you're reinstalling the spark plugs to torque it to spec, you don't want to expand/strip the head's spark plug threading.
Even with no gasket leak, some oil wetness can sometimes be found on some plug threads.
Gasket and seals are #1, however.
Gasket and seals are #1, however.
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