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Thread: What is the simptons

  1. #1
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    Angry What is the simptons

    Hi all can i ask what is the simptoms when the EGR valve is not working right or the air mass sencer is going wrong
    I have a cdti 150 /1900cc vectra
    When i start it from cold it starts on 3 cylinders then when i pres the throttle ti gose on 4 but still runs rough till warm /hot
    It revs freely ang gose very well apart from this
    the car is a 04 and only done 34000 miles
    Thankyou for any help
    PS the simptoms seem to be getting worse as time gose on
    Jacko

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    egr - symptom is severe lack of power at low rpm, almost cant set off its so bad. As you rev it suddenly picks up and feels ok. Smokes under throttle. Never had a MAF problem so dont know. 34,000 is enough to need a proper EGR clean.

  3. #3
    Moderator & Events Assistant paulhb's Avatar
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    Vehicle : M5

    Trim : Nothing needs adding

    Engine : 5.0 V10

    Year : 07

    Mileage : 37000

    Default

    Sounds like you have the 3rd injector wiring fault there is a field fix for this and costs about £13.

    http://www.vectra-c.com/forum/showth...light=injector

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    The Mass Air Flow sensor measures the amount of air entering the engine, symptoms of a faulty MAF sensor include stalling, misfiring, poor acceleration etc. normally these symptoms would also be accompanied with an engine management light.

    The EGR valve works by passing exhaust fumes back into the combustion chamber. If the EGR valve is faulty symptoms include rough idling, hesitation and stalling. The EGR valve can get blocked and cleaning may solve the problem.

    A faulty MAF sensor and/or EGR valve will affect all cylinders in the same way, sounds more likely that you have a glow plug or injector problem.

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