Question about 1985 Chevrolet Corvette

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My 1985 corvette smokes out the exaust only when at idle and engine at running temperature.

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Most likely worn valve guides and probably dry cracked and fallen off valve stem seals you may get lucky with just replacing valve stem seals but may need guides installed in heads

Posted on Aug 07, 2010

  • clmercado Jul 27, 2011

    Actually it ended up being the cat converter. It was burned out inside. Replaced with a new one and car runs like new.

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There are several things that can be causing the problems. Blowing smoke and oil out of the valve cover is usually a sign that the engine rings are worn out and/or the PVC valve is not working correctly to remove the gases from the engine case. The radiator boiling over can be from several causes. A bad radiator cap can cause the engine to boil over. Lack of antifreeze can also do the same thing since the later model smog engines run at a higher temperature and use higher pressure radiator caps. A cracked head can also cause the radiator and engine to overheat. This can be checked at a local parts store with a radiator checker that will show if there is exaust gases in the radiator when the engine is running. Worse case senerio is you blew a head gasket out and your oil will look like bubbly milky creamy in color from the water that has gotten into and mixed with the oil from the engine. You are going to have to do some trouble shooting on this one to find the answers. Good Luck, RAC

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