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Thread: vibration

  1. #1
    Newbie
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    Default vibration

    I recently purchased a 2004 5.3 liter Suburban. It runs and drives perfect, but at idle it has what seems to be, a harmonic vibration. It vibrates in neutral or in gear, with the a/c unit on or off, it is not a bad vibration but it is annoying to me, most people probably wouldnt notice it. The vehicle has 60000 miles on it. The dealer acted as though nothing was wrong with it. You can increase the RPM by only the slightest amount and the vibration stops immediatly. The check engine light has not come on. I was wondering if anyone else has experienced this problem, or could tell me what may be causing it. I have already tried putting fuel injector cleaner inthe tank and cleaning the throttle body but this did not help. Any suggestions or comments would be greatly appreciated. Thanks.
    Last edited by jdog468; 02-16-2009 at 12:34 AM.

  2. #2

    Default

    Out of true harmonic balancer?
    Scott

    ΜΟΛΩΝ ΛΑΒΕ

    '94 Chevy Suburban K1500
    3" exhaust w/ aero turbine non-baffled muffler
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    CB w/ 44" whip antenna


  3. #3
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    Default

    Ive visually inspected all of the pulleys and belt, every thing looks normal but my vision is not as good as it used to be.

  4. #4
    Jr. Engineer black jack's Avatar
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    Default

    i wondering if you take white paint and put a dot or line on the balancer then take a timing light and use that to see what the balancer does.

  5. #5
    Sr. Apprentice
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    Loganville, GA
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    Just by looking at the harmonic balancer while it is spinning, it will appear to be out of round but it really isn't. GM has an info bulletin about that. I would suspect one of your engine mounts is probably broken.

  6. #6
    Legend cascott325's Avatar
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    this may be irrelevant to the situation, but could it be the tensioner pulley or idler arm?
    2000 silverado with a 5.3l v8, shorty headers, upgraded plugs, 10 mil wires, magnaflow high flow cats, flowmaster 80 series muffler(2 in 2 out) w/ 18 inch stainless silverline tips. i have a k&n CIA. its a 4x4 z71 offroad package. Ls model.
    extended cab 160k miles, truxedo low profile bed cover, diablo sport predator tuner.
    reman tranny @ 130k miles
    Chris

  7. #7

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    My truck has been doing the same thing. I believe that my noise is from the air conditioner pump, If I put just a little bit of pressure on the tension arm on the a/c pump it goes away and my tuck is quiet but when I let go it comes right back?

  8. #8

    Default

    Check for any lines touching the firewall.

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