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2002 chevrolet z71 1500 engine cold knock maybe piston what is the cure ?

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Yes, this is usually loose pistons. Boring the engine and replacing pistons would fix it. But, this won't hurt anything and lots of vehicles do it. Unless it really bothers you, I wouldn't even fix it. As long as the knock goes away after the engine warms up a little. Do you have any other problems could lead you to a different solution? Like check engine light or low oil pressure when cold?

Posted on Mar 05, 2009

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It could possibly be a knock sensor bad.

Posted on Jun 09, 2009

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If you have a bad piston or rod it would knock all the time not just cold,i would look at other things like the belt tenionser and waterpump

Posted on Mar 05, 2009

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