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  1. #1

    Arrow Silverado Clacking noise. Help?

    Hey everyone, I've got a 2000 silverado 5.3 with 80,000 miles on it. I was running 5w-30 in it and I was noticing substantial lifter/piston noise on startup, so I switched to 10w-30, Hayes manual says its ok in warmer weather, I live in miami. the start up "clacking" deminished but I noticed when Im cruising at 65 - 70, I hear a ticking noise.

    Question is, is that a lifter acting up or is it the "piston slap" that I read people talking about? and is it an issue? I'm figuring that its just loosening up internally a bit... No smoke, blow by, and I dont loose any oil..



  2. #2
    Master Mechanic
    383man's Avatar
    Join Date
    May 2008
    Chehalis, WA


    its probably lifter slap, but could also be pinging due to using low octane fuel, try premium on a tank and see if it goes away.

    2009 silverado Crew Cab LTZ Z71 4X4
    6in FabTech suspension lift
    35x13R18 nitto terra grapplers
    6k and risin

    Previously owned vehicles-
    2007 silverado ext cab LT 4x4
    2001 silverado std cab 2wd
    1990 toyota pickup
    1989 Trans Am GTA
    1957 Chevy Pickup stepside

  3. #3
    Jr. Mechanic
    Join Date
    Jul 2008
    Bluegrass Country


    This is a common problem on the earlier 5.3 liter engines. The lower end tolerances were a little loose as far as piston slap, valve train noise is concerned. GM engineers have said it's nothing to be concerned about, the engine won't come apart, but they have recommended to start and run at an idle for approx. 20 seconds before putting a load on the engine.

  4. #4
    Jr. Apprentice
    Join Date
    Oct 2009
    dawson creek bc


    ya mine does that to.. thanks for the info guys makes me feel better

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