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VT losing power upon acceleration

Discussion in 'VT - VX Holden Commodore (1997 - 2002)' started by Almighty vt, Dec 11, 2018.

  1. Almighty vt

    Almighty vt New Member

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    Hi all, have an annoying problem with
    My car (1999 VT commodore) wouldn't start the other day unless I pushed the accelerator while turning the key, after it started if I let my foot off the accelerator the car would stall, I held it at 1k revs (idle revs when cold) for a minute and let off to see it was holding idle on like 200 revs so really struggling.

    Left it 5 minutes then it started fine and has been since but it's caused a new problem.... If I'm driving I lose power, as in I'm doing 100km go to put my foot down and it holds back (you can feel it grab itself then itll let go and grab again) only does it sometimes not all the time.

    Also does it when taking off sometimes, it's so annoying and has me stumped. I've replaced the following, leads, plugs, coil pack. So it's not weak Spark. Also replaced, tps sensor, throttle body, new K&n air filter so it's not air either now the next thing is fuel... all Ive done is replace the fuel filter. The fuel pump also buzzes really loudly.

    If you've ever driven a manual commodore with traction control and dump the clutch it grabs itself, that's what my car's doing except it's auto no traction control and also only when trying to speed up. Any help would be amazing...

    Sorry that it's a long read. TIA
     
  2. krusing

    krusing Well-Known Member

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    Sound like a vacuum or Intake issue, check your Vacuum hoses, IAV or MAF meter could be faulty, check the connectors, they are a common reason why they wont idle.
     
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  3. Almighty vt

    Almighty vt New Member

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    Cheers, checked vacuum line and one was split, just cut it short and reconnected it
     
  4. Almighty vt

    Almighty vt New Member

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    So it's still doing it, like it starts first time everytime drives but still does that gutless no power thing, it's really weird and has be stumped, it's a different motor as we replaced the old one due to doing a head gasket and yeah now I have this problem instead
     
  5. krusing

    krusing Well-Known Member

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    Same motor type motor ?,
    Have you check if there are any codes ?
     
  6. HSVBMW

    HSVBMW Member

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    If fuel tank is below half full, fill to 3/4 to rule out fuel return line issues. You said pump is loud which means the fuel pot the pump sits in is empty causing fuel starvation. Above half a tank fills pot and solves problem until you can drop tank and fix internal line.
     
  7. HSVBMW

    HSVBMW Member

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    Also make sure your fuel filter is fitted the right direction, fuel pressure regulator is working properly (fuel in vacuum hose means diaphram toast),ignition module working when hot, crank angle sensor, coolant temp sensor....etc...etc
     
  8. Almighty vt

    Almighty vt New Member

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    Same motor type, fuel filter is on the right way, also found a bad earth, one that the battery terminal earth's off was loose, tightened that up now to see if it fixed the problem, thanks giys
     
  9. Almighty vt

    Almighty vt New Member

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    Also getting codes 12 22 32 and 76.

    I know the codes but will see if it still does the thing after fixibg the ground wires
     
  10. krusing

    krusing Well-Known Member

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    Hi there, the codes in question are as follows -

    12 Satisfactory operation - Self Test ok
    22 Throttle position sensor (voltage low) - Faulty Throttle position sender ?
    32 Air flow sensor (voltage out of range) - Faulty MAF meter ?
    76 Air/Fuel ratio (variation between left and right banks) - Faulty Oxygen sensors/senders ?

    Keeping in mind, it maybe the wiring connectors/plugs are either dirty, lose, or damaged.

    Hope this helps,
    cheers
     
  11. Almighty vt

    Almighty vt New Member

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    Cheers Krusin, had a mate come over with a scan tool to clear the codes and will see which ones come back and go from there, thanks heaps
     

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