Question about 2006 GMC Envoy Denali
I am having the same problem and the dealer says they checked for an "over-active lifter" - no luck, checked for leaks (there are none!) and checked the plugs, all of which seemed to be darker than they should be. They said the GMC factory rep told them to squirt some clearner in the combustion chamber which will clean out the carbon built-up around the rings. We are to drive the car for 1,000 miles and check to see if the oil level is down. Personally, it sounds like a lot of BS to me!
Posted on Nov 12, 2010
Had the same problem. There is an updated PCV system as the original drew oil from the crankcase and filled the intake manifold. TB on this (don't know the number). Make sure they clean out your intake manifold as there was oil pooled in mine. If you rev to 2000 rpm in park you can see blue smoke prior to fix.
Posted on Feb 23, 2011
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Posted on Jan 02, 2017
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