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Thread: need help ASAP

  1. #1
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    vn 5speed v6 s1

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    Default need help ASAP

    Iv got a vn Commy it is pissing me off wat it's doing is stalling when goes into gear and sounds like its got a tiny mos in it. Now iv replace fuel filter fuel pump plugs leads coil packs the board under coil packs crank angle sencor and harmonic ballencer don't no wat els it could be plzz help.

    O and I cleaned the oxy sencor.

  2. #2
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    vn calais 5.0

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  3. #3
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    vn 5speed v6 s1

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    vn executive series 1 v6 1989

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    it could be the throttle position sensor on the tb cause mine was bugged and almost stalled when it got put into gear

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    few commodores

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    plugs? air cleaner?
    i'm curious, how did you "Clean the o2 sensor"?

    also when you're almost empty on fuel next time, try half a tank of premium 95-98 oct or e10 with 1/4-1/2 a bottle of injector cleaner and open it up a few times to blow the cob webs out to see if it'll make a difference, no gain running it on this fuel all the time just occasionally to help clean it (i know this works cause i haven't had to touch my plugs and leads in over 5 years and the car is still running smooth with no probs, if it runs a bit rough i run that through and it comes good) it may be a completely different issue with yours but it can't hurt to try.

  6. #6
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    vn 5speed v6 s1

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    Alright thanks for the info people I'll try all ur suggestions first thing tuesday morning Missus car so yer been trying to get it running so I don't have to keep saving her off the side of the road lol.

    And gave the o2 sensor I blow out with the compressor fixed it enough to get it home but still playing up.

  7. #7
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    try a propane/butane hand held blow torch on the o2 and burn any crap off it (don't be afraid to heat it till the tip is red), forcing anything in there air or sandblasting (seen someone say they've done that before) if it wasn't buggered it will be afterwards... generally a poisoned o2 may come good in a car if you can get it running correctly, if it's old and worn out/cracked inside there's nothing you can do except replace it, make sure the outer housing where the wires go in isn't covered in oil, if it is replace it and fix the oil leak, o2 sensor have 2 parts used to measure, 1 in the exhaust and the other in the shielding on the outside, if the outside gets covered in oil it will damage them.

    with the blowtorch you can also test them with this, attach a multimeter on volts (mV) setting -ve to the -ve and +ve probe to the sensor output (never attempt to measure resistance this will kill it)
    Place it in a vice, heat it up with the flame and try to get the flame going into the holes/veins, the voltage should rise somewhere between 0.7v to 1.2v (depending on the mixture of the butane/propane to air) handy to leave it in the vice till it cools down also.
    when the flame is removed it should drop back to zero or to - voltage within 2 - 4 seconds, if it drops slower than this the sensor is possibly lazy and slow
    (This is a rough test to check if it's working at all. Not 100% accurate test, if you can't get any reading from it even when it's red hot then it's probably dead)

    need help ASAP-o2test.jpg
    Last edited by Jxw; 30-01-2012 at 01:14 AM.

  8. #8
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    vn 5speed v6 s1

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    Yer alright mate I'll give that a try and see wat happens.

    I'll also give the tb a clean out and make shore it all clean and no shits in there had a look at it other day and it looked pritty clean but never no could be crap in it.

  9. #9
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    vp calais, vn calais, vp berlina all 3.8 litre

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    to check your codes bridge these 2.

    dont sweat the petty... pet the sweaty...

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    vn 5speed v6 s1

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    muttley383 is offline Donating Member
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    vn 5speed v6 s1

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    Quote Originally Posted by LUR-11D View Post
    Wats ica circuit
    It is the stepper motor that varies the air leak across the throttle plate.
    It is the system that controls the idle speed of the vehicle by continually adjusting the amount of air that bypasses the throttle plate to keep the idle rpm to the desired level.

    They get blocked up with carbon and oil and require cleaning out ocassionally.
    muttley383

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    vn 5speed v6 s1

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    I dont know where it is on a V6, but on the V8 it is attached to the throttle body with a connector with 4 wires going to it.
    muttley383

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    vn 5speed v6 s1

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    Ok cheers I'll have a look and see wat I can find

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