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Old 05-29-2006, 07:19 AM
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like a knock

I have been told by a dealer in my area I cannot do anything about the knock in my 2001 Silverado's engine. They gave me a printout that came from GM saying it was a design flaw and that it would in no way hurt the engine and would not be repaired. Others have told me I could get the engine rebuilt on my own but since it was a factory design flaw, I was wondering if it would be the same knocking noise in the engine again? Also is this problem with all of the 4.8 engines or just a couple years?

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Old 05-29-2006, 07:52 AM
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lots of GM truck engines do that. my 95s10 4.3 does it. its called "piston slap".

mine sounds something like this (crappy laptop speakers make it sound a bit different)

http://www.pistonslap.com/
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Old 05-29-2006, 11:03 AM
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Yep, every LS, LT, and 4.3 engine has it. Piston slap. It doesn't hurt. My LT1 has had piston slap for 109,000 miles.
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Old 05-29-2006, 11:38 AM
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Like A Knock

Quote:
Originally Posted by Vortech 4.3
lots of GM truck engines do that. my 95s10 4.3 does it. its called "piston slap".

mine sounds something like this (crappy laptop speakers make it sound a bit different)

http://www.pistonslap.com/
Thanks for getting back to me. I know about the piston slap and have heard about it alot from other truck owners. I was wondering what some of the guys had done in response to hearing GM would not fix the engines.

Last edited by ourchevytruck; 05-29-2006 at 11:40 AM. Reason: spelling
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Old 05-29-2006, 12:11 PM
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check this out

check this out

My entry # 8

motor KNOCK
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