Oil in spark plug hole - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain

02-09 Vortec 4.2L I-6 Engine and Drivetrain Q&A forum for engine and drivetrain repairs/modifications/tuning.

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Old 09-13-2006, 04:48 PM
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Badvada Badvada is offline
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Oil in spark plug hole

When I was changing the plugs and got to the second hole from the front I found about 3 or 4 drops of motor oil at the base of the hole. All the others were dry. All I can think of is a gasket is leaking. Maybe valve cover gasket? Is this common? BTW it has 91k miles on it. Thanks.
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Old 09-13-2006, 04:55 PM
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Seems like it is a common thing.. mine had a little oil in a couple, and have read a few others finding the same.
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Old 09-13-2006, 06:08 PM
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Very common on this type of cylinder head. It's rare to see a completely dry spark plug well once they get up in miles on any make/model. Most tower seals are just an O-ring, but given the egg shaped chambers on the vortec 4.2L, they are probably an RTV seal. 2006+ appear to have a cylindrical (o-ring) design.

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Old 09-14-2006, 09:07 PM
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Just changed mine and noticed a small amount on #3. Put the new one in and did not worry about it. My Honda 2.2 has similar design and it did the same thing starting at 100k.
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Old 09-14-2006, 09:31 PM
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Hmm, bet that's why then went to an aluminum cover for '06, to keep the leaks to a minimum. The newer aluminum cover should provide more even force across the entire length of the cover, as opposed to the original composite piece.
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