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Anonymous Posted on Dec 17, 2013
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08 5.3 chev, erratic knock loud erratic knock on start up

Very loud knock, erratic, sounds like sticking valve and piston hits it! any help?

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Anonymous

  • 855 Answers
  • Posted on Oct 03, 2009

SOURCE: Sounds like the valves or pistons is knocking

If it is a knocking noise, you could be hearing bearings or pistons.In either case it is internal. The engine would have to come out and be rebuilt. On something like this there is no easy fix or short cut that can be taken.

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Anonymous

  • 12 Answers
  • Posted on Feb 21, 2011

SOURCE: early morning sounds like knock but goes away 2002

This is common on all 4.6 5.3 6.0 engines. It is carbon build up on the pistons. GM sayes there is no solution for this. It will not hurt the engine. The noise should stop after about 3 minutes of running.

skychief2001

Stephen

  • 21873 Answers
  • Posted on Jul 24, 2012

SOURCE: Loud knocking sound

They did not hear the noise or did they not drive the truck ?
It could be something in the brake system too.

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