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Thread: gsi back firing

  
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    BEEF-1.8sri's Avatar
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    gsi back firing

    can someone help, my car is popping and banging when reved hard.

    there is no lights on the dash,

    i thought it was the turbo but i have change that and still doing it..

    cheers
    204.5 bhp and 202.8 lb/ft torque
    ARDEN BLUE GSI STAGE ONE ON THE WAY

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    dmc-86's Avatar
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    i have heard my car pop when reving when the engine is cold
    MK4 ASTRA GSI NO MORE
    **MAZDA RX8 R3**
    DMC-86

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    its over fuelling by the sounds

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    is the tip of the exhaust really sooty? thats a sign of over fueling. if not are you sure its not just down to the exhaust sytem on the car? as some cause pops and bangs.
    Astra T9 estate for sale, see my ebay link!

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    it hasnt always done it.

    if it is over fueling what could be the cause?

    cheers
    204.5 bhp and 202.8 lb/ft torque
    ARDEN BLUE GSI STAGE ONE ON THE WAY

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    881thomas's Avatar
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    afm meter can cause this, many years ago i had this problem on my first coupe turbo. replaced the afm and all was good!

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    i did have the lights on the dash (tc and another one) which people on here said was afm but they went out so it could be on its way out then
    204.5 bhp and 202.8 lb/ft torque
    ARDEN BLUE GSI STAGE ONE ON THE WAY

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    yeah it could be getting weak, p0170 and p0100 normaly mean afm, if you can check your fuel trim on a tech 2 this will confirm the overfueling.

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    there is no codes at the moment tho...
    204.5 bhp and 202.8 lb/ft torque
    ARDEN BLUE GSI STAGE ONE ON THE WAY

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    when i had my phase 2 i had a afm go (standard 70mm one), overfueling alot, no codes and no lights. car was very jumpy on half throttle, that was how i noticed it.

    i would replace it, along with the plugs. put a post in your regional reigonal forum asking if you can try a known good afm from a local member, this should tell you for sure if its faulty.
    Astra T9 estate for sale, see my ebay link!

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