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Thread: knocking sound

  1. #1
    Join Date
    Nov 2007
    Location
    Saint Marys, GA
    Posts
    198

    knocking sound

    I think that one of my lifters is making a noise. It is a tapping noise which gets faster as the rpms go up. Anyone know how to check which lifter it is and how to adjust it? Thanks
    Current Mods: 6.0/4L80e with Trick Performance Front Mount
    Audio: Pioneer avic-d3, Memphis Belle, Two 12" Rockford Fosgate P3 shallow mounts, Memphis MS-Qs, and custom vinyl enclousure.

  2. #2
    Join Date
    Sep 2008
    Posts
    322
    Mine does this.. and seems most do. Mine has a hard knock when starting cold for a minute.
    - Waiting for an lq9 swap - Super 40 center in dual out - battery swap to spare tire location - exhaust turndown -

    2

  3. #3
    Join Date
    Dec 2008
    Location
    Kentucky
    Posts
    166
    thats the notorious "Piston Slap" that these lsx motors have...mine only does it when its like 20 outside...but it does it...
    2001 GMC Sierra 4.8
    lowerd 2in in rear
    custom cat-back
    and the ever so mighty K&N

    -"Faster, Faster until the thrill of speed overcomes the fear of death."

    -Load it like a Freight Car
    -Polish it like a Show car
    -Drive it like a NASCAR

  4. #4
    Join Date
    Nov 2007
    Location
    Pittsburgh, PA
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    3,581
    lifters arent adjustable, check for exhaust leaks
    2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
    2002 Silverado - 427Lsx w/ Twin gt4202s
    2010 Silverado crewcab Z71 - 5.3litre w/ procharger
    2000 Wrangler - 5.3litre with some stance
    2014 Xsport- 3.5 Eco boost
    412 Motorsports

    it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference

  5. #5
    Join Date
    Feb 2007
    Location
    College Station, TX
    Posts
    2,193
    I had the same noise in my 4.8, If its a sticky lifter, go buy yourself a can of Rislone from O'reillys and put it in right after a new oil change. It will clean away the gunk that is causing it to stick if thats the problem
    2012 F-250 XLT/FX4 RCLB 6.7 Powerstroke
    H&S XRT Pro Race(550hp/1100tq)/ 4" flopro exhaust/H&S EGT kit/SPE Full diff unlock/S&B CAI/H&S motorsports upcharge pipe kit/ DPF,CAT,EGR,UREA Deleted/Icon 3.5" Lift-Vs 2.0 shocks/PMF DSS w' Bilstein 5100s/Icon Adj Track Bar-upgraded steel bearing/RIGID LEDs/Kenwood DNX570HD w/idatalink maestro/Hertz5x7s/Memphis 12" slim/500.1 JL slash amp/Recon f250 led emblems

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