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Thread: Problem part found - Need help identifying

  1. #1
    Regular Member skivandal's Avatar
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    Default Problem part found - Need help identifying

    My Signum 3.2 Petrol had a very infrequent fault, where it would stall and then refuse to start. After a few minutes it would start and everything would be normal again. It used to happen every 3 months or so, so not anything to get to excited about, till last week.

    Then the problem became near constant, the car refusing to start. Cleaned out the throttle body as some of the symptoms suggested that might help. It did not make any real difference, but after refitting a new seal (yeah the old one broke) i failed to reconnect the connector as illustrated in teh photos. With it disconnected it now starts every time, but runs rough at idle, which becomes smooth when the throttle is depressed but full throttle only rises the revs to about a 1000 and the car drives very very slowly.

    So what does the connector control, could it be loose wiring, what next step should i make etc.

    Details of the problem were earlier posted here
    http://www.vectra-c.com/forum/showthread.php?t=138830

  2. #2
    Regular Member J's Turbo's Avatar
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    Rough guess could be throttle body sensor? Did you plug it in the diagnostics?

  3. #3
    Regular Member m8internet's Avatar
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    The smartie box shaped tube is the IAC valve
    This suggests the connector is simply an updated sensor for it

    What did you use to clean the IAC valve?

    On my previous X20XEV engine the IAC valve was faulty but was refused as a warranty claim as it was still working and not reported as a faulty sensor, instead they approved a modification to the breather pipe which made no difference
    I then removed it and cleaned it myself
    I found the trick was to leave it for 24 hours in a warm place so that the cleaner fully evaporated
    A new gasket was not essential, but recommended
    However this only lasted three months (10K miles), proving it was indeed the IAC valve, and so I fitted a new one
    Subsequently VX agreed with the warranty claim and paid for the part, however they did not approve removal of the breather modification so I also had to purchase an original pipe and replace this
    Last edited by m8internet; 8th October 2011 at 14:37.

  4. #4
    Regular Member skivandal's Avatar
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    Used some WD-40 and a cloth and a few ear buds for the tricky parts, there was some carbonisation but not a great deal. I had it off the car for a few hours as i had broken the gasket and knew it would be a while till i could get hold of one. That was last weekend.

    This morning i fitted the new gasket, and that is when i forget to reconnect the plug, and discovered that without the plug it starts fine. When i reconnected the plug with the engine running it immediately cut out. And with the plug connected and ignition on, there are a lot of solenoid sounding clicks from the engine, it was hard to definitely locate the source but the IAC was a possible source.

    To clarify i can not drive it at the moment as when i fully depress the throttle the revs only climb a hundred or so revs which smooths the running of the engine but it just crawls forward as if stuck in first gear on idle revs.

    Previous to all this it ran like a dream.

  5. #5
    Regular Member skivandal's Avatar
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    Oh yeah and no i have no access to any diagnostic kit to plug it into. So its a no on that at the moment.

  6. #6
    Full Member chrisvectra's Avatar
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    Vehicle : VXR8 6.0 muscle SRI ESTATE XP1

    Trim : VXR/ SRI ESTATE CDTI XP1

    Engine : 6.0 V8 Thunder

    Year : 2008

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    Sounds like your iac valve is gossed bud
    If it starts without it connected and won't start/idle with it connected
    VXR IS FOR LIFE NOT JUST FOR THRILLS !



  7. #7
    Regular Member m8internet's Avatar
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    Agreed, time for a new IAC valve
    These used to be around the £80 mark, but probably nearer £110 now

  8. #8
    Regular Member LADmachining's Avatar
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    The part is the electronic throttle body actuator.

    Newer fly-by-wire throttle engines do not have an idle air control (IAC) valve. The electronic throttle body is controlled by the ECU, and regulates the idle speed.

    With it disconnected, the engine goes into limp home mode, and the throttle does not open when the pedal is depressed, hence not being able to rev the engine.

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