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Thread: 97 C5 random stalling on decel

  1. #1
    Tuner in Training
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    Jul 2014
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    97 C5 random stalling on decel

    Hey guy's,

    This is the first car I have ever tuned. I runs really well but it will randomly die sometimes when coming to a stop in neutral or when the clutch is pressed. If the rpm's do catch themselves the idle is very smooth. I have been fighting this issue for about a month and nothing I tried has seemed to work. I've tried playing with the timing, adjusting RAF and the throttle cracker as well as retuning my VE and MAf tables. I'm still very new to this so I'm sure I am just over looking something. Car is ran in OL full time and was tuned with a innovate mtxl wideband ran through the EGR pid. Any and all help is appreciated.

    97 Corvette
    manual trans
    232\234 112lsa cam
    Dart 225cc heads
    fast 78 w/stock TB
    LT's
    #42 green tops

    I uploaded 2 scans and the current tune in the car, but i cant get the config file to attach for some reason, I'll keep trying though.
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    Last edited by Deputy_Dangle; 09-02-2014 at 05:55 PM.

  2. #2
    Tuner in Training
    Join Date
    Jul 2014
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    Also here is a scan of it dying at speed when i pressed in the clutch. Frame 1599
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  3. #3
    Tuner in Training
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    Jul 2014
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    Anyone have any idea's??

  4. #4
    Tuner in Training
    Join Date
    Jan 2014
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    13
    check your iac counts and make sure they are in line

  5. #5
    Tuner in Training
    Join Date
    Jul 2014
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    13
    I was under the impression the IAC counts didn't mean anything on DBW cars. Is this not true? I made another scan last night after making some changes to the throttle cracker and although the car never died it still over shoots idle and surges. It looks to me like the timing swings pretty drastically around 2000rpm on decel, I am going to try some changes to the timing today and see if it helps any.
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  6. #6
    Tuner in Training
    Join Date
    Jul 2014
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    13
    Today I added about 60% to the the lower end of the throttle cracker table and upped the timing to around 28* around idle and lower engine speeds. The car never died on me after these changes but it does have a very slight surge sometimes as the idle falls to around 850rpm and jumps up to about 1200rpm where it will stay until I reach zero mph. I think I may have added too much air to the TC and its causing the surge. Any suggestions? Unfortunately I haven't got a scan of this yet.