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  1. #1

    2003 GTI (717) Backfiring through Carb

    I have just completed a rebuilt on a the motor of a 2003 GTI.
    Crank Rebuild, Bore and new pistons, Carb rebuild. Starts fine each time but is backfiring badly through the carb.

    I have triple checked each of the following.

    RV timing is checked and correct.
    Leak Test carried out on the Cooling Circuit, crankcase and RV system. All passed fine.
    Fleywheel key is fine.
    Good Compression.
    Magneto coil was marked before removal and reinstalled in same position.
    Charge coil and generating coil test as per the manual, both working fine.
    Also checked the crank for correct alignment. Also fine.

    I swapped each of the following from a working ski and still have the problem

    Rectifier. MPEM. Ignition Coil.

    The only thing I have not checked is the ignition timing using the timing light as per the manual.

    Does anyone have any other ideas as to what is causing this problem.


  2. #2
    mrbtd's Avatar
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    leaking needle/seat could cause it.

  3. #3
    PEST!'s Avatar
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    sounds to lean for some reason. Rebuild carbs and replace the Diaphrams pump parts and filters.

  4. #4
    Quote Originally Posted by steelroe View Post
    I have just completed a rebuilt on a the motor of a 2003 GTI.
    Crank Rebuild, Bore and new pistons, Carb rebuild.
    Carb etc were rebuit as part of the engine rebuild

  5. #5
    PEST!'s Avatar
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    Yea I never miss anything either
    just remember K.I.S.S.

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