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Knock at cold start 700

posted by  hawkeye on  Tue Apr 30 15:06 CST 2002
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last visit: Wed Oct 22 16:44 CST 2014
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I have a 1990 760T but I am worried about a solid knock during a cold start. The colder it is the more pronounced and longer it lasts. The car seems to rum fine but I am worried. I have some valve/lifter noise but this is louder than that. Any help????

hawkeye








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Knock at cold start 700

posted by  Andrew Woods on  Tue Apr 30 16:20 CST 2002
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It's called piston slap, and it's nothing to worry about. It happens when the piston rocks in it's bore bacause it's cold and hasn't expanded yet. My 91 245 has a loud case of it. I think Volvo solved the problem in 93 when they used longer pistons, my 94 940T is slap free.

Andrew Woods
--
My 91 245







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