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Thread: Z22YH misfire issue

  1. #1
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    Default Z22YH misfire issue

    Hi,
    I've read a lot on this forum and others about the hi pressure fuel pump and pressure regulator issue.

    I have an 04 Signum elite with the 2.2 direct engine.

    Symptoms:
    Car drives perfectly most of the time.

    If I try to accelerate hard from just around the 2K mark, the engine misfires.
    (especially if cornering or on a steep gradient)

    If I back of the throttle slightly and re-apply it, the misfire clears and all is well.

    If I keep the throttle pressed for more that 5 seconds the engine management light comes on. Car continues to misfire. Engine light stays on. If I turn the ignition off and then back on (while moving, clutch depressed) the misfire clears but the engine light remains. This light may turn its self off after a few days.

    Fault codes are (from an OP_COM 100219a)

    P0303 - Cylinder 3 Misfire Detected
    (01) - not present

    P0501 - <Unknown DTC>
    (F0) - not oresent

    None of this happens if I don't let the rev's fall below 3K! Fine for me but the wife hates it.

    This fault seems different to most listed as at high RPM its fine, only at low RPM does the fault manifest it's self. I don't want to surge into replacing the FPR and HPF pump or the coil pack, without first getting some advice from this forum.

    My experience is with landrovers and motorcycles not VX stuff so as few acronyms as possible please.


    cheers

    Arron

  2. #2
    Regular Member kenp's Avatar
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    Vehicle : Insignia

    Trim : Dynamic

    Engine : 1.6 turbo

    Year : 2019

    Mileage : 44000

    Default

    Those error codes are not related to the high pressure pump, fuel regulator or fuel regulator sensor..

    But try to get the error code while its there.. because it sounds like mine.... (not excatly but mostly like the error i have right now)

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    Vehicle : vectra

    Trim : vxr

    Engine : 2.8 v6 turbo

    Year : 2007

    Default

    Coil pack

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    Default

    is the coil pack on the Z22YH the same as all the 2.2's?

  5. #5
    Regular Member kenp's Avatar
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    Trim : Dynamic

    Engine : 1.6 turbo

    Year : 2019

    Mileage : 44000

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    atleast in the Z22YH ones..

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    Smile

    Just to close the loop, new coil pack and new plugs. Problem solved.

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