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2001 Chevy Malibu that has a tapping sound when engine is cold?
Wiki User
∙ 15y ago
My 2000 Malibu with a 3.1 V6 is the same. A pro mechanic friend said the noise is due to one or more of the pistons having shrunk due to overheating. Once warm, the pistons enlarge with the heat, and the noise disappears. This is a design flaw with the early v6 engines. He added that it is not anything that will affect the life of the motor so long as I let it warm up before use. He cautions that heavy acceleration while the engine is cold could possibly cause a piston skirt to break. Just let it warm up and it will be fine.
Wiki User
∙ 15y ago
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