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5.3 tapping while idling


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  • 5.3 tapping while idling

    I have a 2000 Silverado 5.3 with about 107k on it. When it is idling it has a slight tapping sound. It does not seem to be anything that is harmful, but it is kind of annoying. Does anyone know what is causing this or any way to fix it?

    It does it even after it has been running for a while so it is not the "piston slap at start up" problem. It will go away after you rev the motor but will soon reappear.

    Thanks in advance for your help.
    2004 GMC Sierra 4wd 2500HD CC LLY/Alli
    2000 Silverado extended cab Z71
    1995 Silverado extended cab Z71
    1984 Silverado K10 6.2 lwb
    1972 GMC Jimmy 4x4

  • #2
    Re: 5.3 tapping while idling

    do you think it may be the fuel injectors?
    95 Z71 5.7 A/T, 03 Yukon 5.3 A/T


    • #3
      Re: 5.3 tapping while idling

      Could be carbon build up. If you like you could try running some gm top end cleaner through it. Available at any gm dealership. Could be sludge in the oil passages.
      Last edited by justy; 09-04-2007, 11:44 PM.
      Duramax badger truck pullers association.
      Real trucks don't have spark plugs!

      2007 3500HD NBS Duramax
      2005 2500HD Duramax sled puller
      1996 1500 6.5L converted SVO/WVO 16city/22hwy
      2006 arctic cat prowler 650 H1
      5th wheel 34' PJ flatdeck trailer


      • #4
        Re: 5.3 tapping while idling

        maybe rockers need adjustment