afpj
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- Joined
- Sep 16, 2009
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Hey alI , 2002 Yukon with 174k miles. I've read all sorts of threads about piston slap and lifter tap. I think I have closer to lifter tap sound but coming from lower part of engine rather than topside. It only happens after a little rev of the engine when cold, and only when the rpms come back down, not when rpms go up or at peak of the rev, and I'm only talking up to 2000 rpm max. Hope that made sense. The noise is gone after engine warm. Does that sound like pushrods to you gurus? Hopefully not a main bearing, but it's a tapping sound not a deep knock. Oil pump? Any opinions appreciated thank you.
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