Question about 2001 GMC Yukon Denali
First, check your dipstick and make sure you are not overfilled. Too much oil will cause these problems. If there is too much oil, do an oil and filter change and see if it helped.
Your engine should be missing. Replace the oil soaked plug and see if it helps. It will foul out shortly if there is a more serious problem. You should have a compression test to determine the next step.
If the problem was not too much oil, you may need valve seals or a head gasket or new rings for the bad cylinder. There is only a slim chance that tightening the head bolts will eliminate the problem. Get the compression test done at a reliable Repair shop.
Posted on May 07, 2010
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Posted on Jan 02, 2017
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