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Thread: Mk4 2.0L Engine Stopping - ECU Fault

  1. #1
    Join Date
    Dec 2019
    Location
    Sydney
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    1
    Users Country Flag

    Mk4 2.0L Engine Stopping - ECU Fault

    Hey Fans,

    I purchased a MK4 for my son and it has been great until the engine just quits . It will start again when cooled a little . drive for a bit , then stop again . I plugged in handy dandy code reader expecting crank angle sensor or coil pack and it reported no faults . However , we trouble shooted on the weekend by letting it idle until it quit , then plugged the reader in . It could not communicate with the computer . After 10 mins , communications were re-established and the engine would start again.

    After consulting the Google Gods , it seems that the ECU may be faulty ( random engine stops and inability to connect a reader when this happens ) .

    Any input here for MK4 owners ?

    Also purchased VAG-TAcho from ebay , but it will not connect to the cable and software had virus.

    Any recent recommendations for a VAGTACHO , as I know ill have to re-programm the IMMO if I need to swap the ECU.

    Or... Am I up for $299 US for the Rosstech unit ?

    Cheers

    MK4Dad

  2. #2
    Join Date
    Apr 2014
    Location
    Penrith, NSW
    Posts
    601
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    PM IanGPonzaga on here, he'll be able to give you a hand with any programming.
    2004 VW Bora V5 | Daily (Until the Bora R32 rises from the ashes!!)
    2004 VW Bora 4motion Oettinger | DBA Slotted Rotors | R32 Trim | 3’’ BBE Exhaust
    2004 VW Golf R32 | Donor / Part Out

  3. #3
    Join Date
    Jun 2005
    Location
    Albury, NSW Australia
    Posts
    300
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    Have you had any luck mk4dad?

    My GTI has the same issue and a genuine new ECU + labour is getting close to 50% of the value of the car.

  4. #4
    Join Date
    Jun 2005
    Location
    Albury, NSW Australia
    Posts
    300
    Users Country Flag

    It’s alive! (?!?)

    I might have fixed the issue with my GTI. I bought a used ECU and physically transferred the immobiliser chip.

    The car has been idling for about an hour since and seems fine. No error codes and no stalling.

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