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Thread: Lean tip in/low advance, makes the car stumble and backfire [LS3 Stroker 24x]

  1. #1
    Tuner in Training
    Join Date
    Jun 2017
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    42

    Lean tip in/low advance, makes the car stumble and backfire [LS3 Stroker 24x]

    Hi,

    I been tuning this thing for weeks now, it runs and drives really nice! All is good, except for when you really punch the throttle from a stand, still or very low speed speed.
    Then its hesitates, stumbles, maybe backfires a bit, then breaks traction - and off you go in smoke!

    I have provided my a log where you can see that I provoke this, I get a lean spike just before the PE comes in. My spark advance also drop really low?
    I?ve deleted almost all burst knock, so Im not sure where its coming from? If I log all advance modifiers PIDs they are all 0. (Not in this log but tried it the other day).

    Is it the lean tip in on 16-18:1 AFR, that causes the stumble, or the drop in advance? Both?
    Im also under the impression that my injector data is correct? Could that cause this?

    VE and MAF is dialed.It will do this in SD, MAF open and closed lopp. No change.

    LS3, 92mm TB, LS3 intake, LS3 injectors, 233/240 cam. 24x 411 LS1 PCM.

    Please let me hear what you think?
    Attached Files Attached Files
    Last edited by LSSwapDenmark; 05-06-2019 at 03:35 PM.

  2. #2
    Potential Tuner
    Join Date
    Sep 2018
    Posts
    6
    Following. Mine does exactly the same u described although its a ford coyote.

  3. #3
    Potential Tuner
    Join Date
    Jun 2018
    Posts
    8
    was this solved? having the same issue.

  4. #4
    Advanced Tuner
    Join Date
    Sep 2017
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    736
    I cannot look at the logs at the moment without my laptop and i will not guarantee that this is your solution, but from my personal experience with 0411 24x swaps and a few other people that ive seen the exact same symptoms, i would look into injection timing.
    I could throw somthing together for you
    1997 30th SS. Torqhead 24x, TFS heads, 223/235 cam, 4l80e, S60 D1SC 14psi

  5. #5
    Advanced Tuner
    Join Date
    Sep 2017
    Posts
    736
    1997 30th SS. Torqhead 24x, TFS heads, 223/235 cam, 4l80e, S60 D1SC 14psi

  6. #6
    Advanced Tuner
    Join Date
    Sep 2017
    Posts
    736
    what specs are your cam and what are your idle pulsewidths?


    Also what map sensor are you running?
    Last edited by anniversaryss; 08-03-2019 at 07:17 PM.
    1997 30th SS. Torqhead 24x, TFS heads, 223/235 cam, 4l80e, S60 D1SC 14psi