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VS Ute Knocking noise

Discussion in 'VR - VS Holden Commodore (1993 - 1997)' started by jwaye2, Jul 4, 2011.

  1. jwaye2

    jwaye2 New Member

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    My 97 VS V6 Ute has a knocking noise in Idle. once u apply any amount of throttle it stops knocking. also in 1st gear taking off runs very rough but second gear onwards runs great. Fuel system is all clean and working and so is ignition system. any ideas on what the problem may be?
     
  2. SP00KSTER

    SP00KSTER New Member

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  3. jwaye2

    jwaye2 New Member

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    Manual... sorry should have mentioned that
     
  4. SP00KSTER

    SP00KSTER New Member

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    if it's a manual then you might need to change the oil in your gear box as it isn't uncommon to get gear chatter that sounds like a knock, also when in first gear then engine has to cope with a fair bit of force which will bring down the revs so id be looking at cleaning your plenum chamber if it hasn't been done for a while as it will increase more controlled air flow allowing the engine to run a bit smoother, also check your error codes see if anything comes up like a faulty sensor as this will affect the way the car runs. if you dont know how to check the codes here is a link
    http://forums.justcommodores.com.au...22307-checking-error-codes-vr-vs-revised.html
    the pictures on the how to are near the bottom if you struggle with directions
    Hope this helps in some way.
     
  5. jwaye2

    jwaye2 New Member

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    Cheers mate. I had a suspicion it might be gearbox related as there is a slow oil leak. ill have a look tonight and see how i go
     
  6. jwaye2

    jwaye2 New Member

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    gearbox seems to be fine. plenum is pretty clean. seems to me the sound is coming from the Harmonic Balancer. could a stuffed balencer be making them kind of sounds?
     
  7. moggy

    moggy New Member

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    A stuffed balancer will make a knocking noise like the bottom is about to fall out your engine.
     
  8. jwaye2

    jwaye2 New Member

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    yer thats what it sounds like. freeks me out when i stop at the lights sitting in idle. might aswell replace the crank angle sensor at the same time.
     

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