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Thread: L77 swap no start

  1. #1
    Potential Tuner
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    Jul 2009
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    L77 swap no start

    L77 swap won't start. Runs on starting fluid. Seems like injectors aren't pulsing. I disabled both VATS and the starter diagnostics. Write All on flash. Is there something I'm missing on the tune file?
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  2. #2
    Tuning Addict 5FDP's Avatar
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    May 2012
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    Rogers, MN
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    You did a Write Entire or a Write Calibration?
    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.

  3. #3
    Potential Tuner
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    Jul 2009
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    Write entire to both engine and trans. Is there something I missed?

  4. #4
    Tuning Addict 5FDP's Avatar
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    May 2012
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    A write entire is needed for the VATS removal. That is why I asked.

    You can double check the file in the car to make sure, do a read entire of the PCM to make sure the VATS is off.
    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.