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Thread: engine cuts out under light load at 4000rpm

  1. #1
    Potential Tuner
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    Apr 2017
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    engine cuts out under light load at 4000rpm

    After a new catback install the car (holden monaro) cuts out at 4000rpm just accelerating, it jerks violently going dead like a hardcut limiter at 4000rpm. Doesn't throw any error codes although it did come in with a crank angle sensor code among others that have been cleared. Only started playing up approx 100kms after the cat back exhaust install. it is not a mechanical cut out it is complete loss of spark or fuel

    ideas would be great.... if not it will be onto the dyno and start searching

  2. #2
    Potential Tuner
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    Apr 2017
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    Car is running maffless 2 bar tune with magnacharger supercharger, long tube headers, 4 bolt 90mm dbw gm throttle body

  3. #3
    Tuning Addict 5FDP's Avatar
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    May 2012
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    Rogers, MN
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    13,533
    Have the tune and any log files on this happening?
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  4. #4
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    Apr 2017
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    Didn't get a chance spent most of the day on a customers race car and didn't get to mine, had a quick look and it has some over voltage coming in from the alternator so will get that sorted before i go any further, could be the problem or fried something as a result