Question about 2004 Chevrolet Silverado 1500
When you let up on the accelerator the vacuum in the manifold reaches 20 inches of vacuum or more. If the valve stem seals are worn/hard or cracked this high vacuum draws air and oil from the head down into the combustion chambers and this is blue smoke out the back It is the same as if you let the engine idle for several minutes and then rev it up and you get blue smoke out the back. It is also possible that if the rings are worn you may get the same affect. I would go for valve stem seals or worn valve guides.
Posted on Nov 18, 2014
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Posted on Jan 02, 2017
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