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Thread: 3.2 Elite showing missfire on 1,3,5

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    Default 3.2 Elite showing missfire on 1,3,5

    I have an 02 plate 3.2 Elite with 60,000 on the clock. Since I bought it just over a year ago, it has had a fault whereby if I leave it idling for more than about 15 seconds, the emissions light flashes on the dashboard and if I don't press the accelerator, the light stays on and then the engine missfires so badly that the car is virtually undriveable. If I turn off the engine and restart it, the fault goes away immediately and doesn't reappear until I leave it to idle again.
    I have taken it to my local garage and they fault coded it to show that coil pack 1,3,5 needed to be replaced which they have done but the fault is still there and now the emissions light is on all of the time with the tickover varying between 600 - 1500 rpm. I am loath to take it to a VX dealer as it is already 10 years old and I can't really justify a £500 bill just to cure a fault.
    Has anyone experienced anything like this or does anyone know what the root cause might be?
    I also replaced the MAF sensor about 6 months ago so that can be ruled out.

  2. #2
    Regular Member v6vc's Avatar
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    Vehicle : Vectra & Signum

    Trim : GSi & Design

    Engine : 3.2 V6 & 2.8 V6 T

    Year : 02/07

    Default

    I would guess that the idle problem is due to an air leak somewhere (after the MAF sensor) and that may be causing a fueling problem.

    I changed my plugs a while back and ended up with un-metered air getting into the plenum chamber. Gave me an idle the same as yours and a fueling issuing (but on both banks). My leak was on the black insert in the chamber but there's also a gasket where the chamber meets the heads, also the plenum cover needs to be air tight.

    That's my guess, quite possibly wrong

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    Default

    Well, the mechanic told me to pick the car up yesterday evening and drive it for a while to see how it runs.
    The emissions light is now off during normal driving but the intermittent fault whilst idling is still there. The avg fuel consumption reading is showing 27+ mpg having reset it last night before I went to work, which it has never done for urban cycle (usually about 24 mpg).
    It seems like the coil pack has cured the main missfire but the idling problem is still there so back to the mechanic today with some advice from the Forums methinks.

  4. #4
    Regular Member v6vc's Avatar
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    Vehicle : Vectra & Signum

    Trim : GSi & Design

    Engine : 3.2 V6 & 2.8 V6 T

    Year : 02/07

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    They will have taken the plenum off to change the pack and I would really start by looking for any air leaks because of this. Possibly could also be unassociated and the gasket has blown on the throttle body.

    Good luck

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    Regular Member DSmiddy's Avatar
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    Vehicle : Signum

    Trim : Elite

    Engine : 2.8 V6T

    Year : 2005

    Mileage : 50000

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    I would check for an air leak mate, I would also take the pipe off between the airbox and the throttle body and see how dirty the throttle body is, I have recently cleaned mine because it was caked in oil and causing a really bad idle which felt like a misfire. Since I cleaned it up the car has been running fine again.

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