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5.3 tapping while idling

This is a discussion on 5.3 tapping while idling within the Technical / Maintenance forums, part of the General Discussion category; I have a 2000 Silverado 5.3 with about 107k on it. When it is idling it has a slight tapping ...

  1. #1
    Registered User DuckhunterInTN's Avatar
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    5.3 tapping while idling


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    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
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    1984 Silverado K10 6.2 lwb
    1972 GMC Jimmy 4x4

  2. #2
    Registered User ruger4d4's Avatar
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    Re: 5.3 tapping while idling

    do you think it may be the fuel injectors?

  3. #3
    Diesel Nut justy's Avatar
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    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 at 10:44 PM.
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  4. #4
    1 Newbie dc96819's Avatar
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    Re: 5.3 tapping while idling

    maybe rockers need adjustment

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