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#1
12-22-2003, 03:55 PM
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Valve Knock 02 GMC 6Litre
GM 6 Litre:
Does anybody have a valve knock on initial starts after an overnite sit. It id more substantial than a regular cold start knock. The dealer said it was normal. It doeas not sound normal, it almost sounds like someone is banging the block with a hammer. It last for about 2 minutes. 
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#2
12-22-2003, 07:36 PM
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Re: Valve Knock 02 GMC 6Litre
you have a lifter that is collapsing when it sits overnight the noise probally goes away after a couple of minutes. if new it should be covered by warranty if old its "normal" a small amount of hydraulic fluid added to the oil 2-300 miles before an oil change may cure it. if not try s.t.p. oil addative but put it in warm and run the engine 15 minutes before shutting it off.
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#3
01-08-2004, 08:13 PM
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