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Thread: Jeep Wrangler JL 3.6L Manual Turbo

  1. #1
    Tuner in Training
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    Jeep Wrangler JL 3.6L Manual Turbo

    Currently working on a 2019 Jeep Wrangler JL with a 3.6L and manual transmission. Have recently installed a turbo and am getting some weird hiccups during cruise. Would love to understand what the neural net is doing.

    Here is what I am finding about the 'hiccup' experience:
    - Issue is consistently occurring at ~25% throttle
    - Only occurs when pushing down on pedal, not when lifting up at same area of pedal.
    - Quick throttle acceleration (passing by 25% area) does not experience.
    - AFR is going very rich during this time (ex 14.7 -> 12.0 or less)
    - Timing is dropping to almost 0 deg (ex 39deg -> 2deg)
    - Injector timing jumps up ~ 2.0 ms (ex 3.6ms -> 5.6ms)
    - Injector timing looks to act before throttle blade position is affected. (ex 21% ->24%)

    Picture & log attached.
    I began looking at BOV and Wastegate being the issue, but they seem to be reactionary to the root cause.

    Looking for ideas from anyone who has chased this on Chrysler products?
    Attached Images Attached Images
    Attached Files Attached Files

  2. #2
    Tuner in Training
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    Can you post the current tune file?
    Is this a Popdigy Performance kit and their tuning?
    Have you confirmed fueling with a wideband?
    Honestly isn't much data on the log posted.

  3. #3
    Tuner in Training
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    Quote Originally Posted by Mag0842 View Post
    Can you post the current tune file?
    Is this a Popdigy Performance kit and their tuning?
    Have you confirmed fueling with a wideband?
    Honestly isn't much data on the log posted.
    Sure thing. Understand log probably isn't real helpful. Hoping others have seen something like this. Attached Prodigy tune.

    Linked is a video of the wideband at cruise with 'hiccup'. https://youtu.be/5bsodOM9TWY

    I don't have a upcharged harness to record wideband in log.
    Last edited by schumbox; 04-14-2020 at 07:01 AM.

  4. #4
    What injectors are you running? Seems to me something(s) are way off on the tune.

  5. #5
    Also it's going rich because it's commanding PE way too soon. The settings are way too low. Set it to 2.0 and also the delays need to be zero'd out. if you need a tune hmu

  6. #6
    i don't see that prodigy tune file