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Thread: LS3 4th gen F-body idle stalling

  1. 02-25-2017 #1
    cscott
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    LS3 4th gen F-body idle stalling

    I recently swapped a crate LS3 in to my '99 Camaro SS. I'm using the OEM LS1 PCM. See the engine link for details on the engine.

    I'm having difficulty getting the engine to idle smoothly, and the bigger problem is idle under load. The engine stalls when turning off throttle as in when coasting because of the increased load of the power steering.

    In the attached scan from 30-39s and from 1:20 - 1:29 I was turning the steering wheel back and forth. I'm not able to safely drive the car to finish up the tune and break in the engine.

    Can someone give me a hand?
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  2. 02-25-2017 #2
    5FDP
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    File is tuner locked.

    Fuel trims are extremely positive at idle and just off idle, that for sure isn't helping you.
    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.
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  3. 02-25-2017 #3
    cscott
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    I realize the fueling is off, and I can make those adjustments. I suspect fueling wasn't the main/biggest reason, so I've let that be until I can get a good test drive done to work on the full fueling map at once.

    I apologize for the locked tune. Here is an unlocked version.
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