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Thread: 2005 Jeep Wrangler Supercharged- Can't force open loop, cant force PE until WOT

  1. #1

    2005 Jeep Wrangler Supercharged- Can't force open loop, cant force PE until WOT

    2005 Jeep Wrangler,
    SRT 4 MAP
    SRT4 injectors
    Walbro fuel pump
    Ripp Supercharger Kit
    Golen 4.6 stroker.

    Long story short, I've been working on this one for 2 years. I'm out a ton of money and time on this, and I'm doing everything I can to make the customer whole.

    Vehicle was originally flashed with Diablo, then SCT, now HPTuners.
    Everything is great.....EXCEPT I can't force open loop (Even if I set enable to 191 C and disable the O2 switches), and I can't get enrichment no matter how low I set the pedal voltage for enrichment .

    HP Support has basically told me (I'm paraphrasing) there is nothing wrong on their end and they cannot help me.

    Could I be dealing with a corrupt PCM?
    Attached Files Attached Files

  2. #2
    Senior Tuner
    Join Date
    May 2015
    Posts
    1,864
    stupid question, how have you verified you are not in open loop? 2005 is a funky year, not sure a reflash clears your fuel trims. You could be just logging old fuel trims learned from before but still be in open loop.

  3. #3
    Quote Originally Posted by 06300CSRT8 View Post
    stupid question, how have you verified you are not in open loop? 2005 is a funky year, not sure a reflash clears your fuel trims. You could be just logging old fuel trims learned from before but still be in open loop.
    Long terms and short term fuel trims are still present.

  4. #4
    Senior Tuner
    Join Date
    May 2015
    Posts
    1,864
    could be the issue I mentioned then, fuel trims are just not clearing from the memory. Pull the ASD fuse or try to the fuel trim reset in the scanner special functions (if its there). There is a parameter you log in the scanner for open or close loop, called Fuel System #1 Status (SAE). See if its there for you, this will tell you your open/closed loop status.

  5. #5
    Potential Tuner
    Join Date
    Sep 2016
    Posts
    3
    In order to reset my LTFT's on my 2005 wrangler, I remove the 3 plugs from the PCM for 5 to 10 minutes. It definitely resets the trims. Only way I've found to do so. I found this information in another post of 06300CSRT8's on these forums.

    I have Coolant Temp and ECT Rear both set at 376F as well, with my O2 sensors enabled, and it keeps me in open loop. STFT's never adjust and Wideband reflects this.

  6. #6
    Potential Tuner
    Join Date
    Nov 2019
    Posts
    7
    Was there ever a solution to this issue? I have a supercharger on my 05 with a piggyback Split Second fuel timing computer. The extra fueling and timing retard is working fine but the Jeep isn't going into open loop like it should be and is trying to compensate for the extra fuel from the injector in the supercharger.

    I've adjusted the TPS WOT triggers to nearly zero and it makes no difference.

    I haven't touched the coolant temp closed loop trigger yet, I suppose that would probably keep it in open loop indefinitely, if it actually works. That's not exactly the solution I'd like either.

  7. #7
    Tuner in Training
    Join Date
    Sep 2019
    Posts
    14
    Would it help to reference a Banks Turbo tune in HPT format? I don't think it always goes open loop instantly either. They use 35 lb. injectors with no extra injector.

  8. #8
    Potential Tuner
    Join Date
    Nov 2019
    Posts
    7
    Can't say that would help my specific issues but it'd still be cool to see what they did, so yeah, if you have a copy of that, that'd be cool. Going to larger injectors all around has been plan b for a while anyway. I did max the coolant closed loop temp yesterday and it drives much better, not fighting the enrichment when the boost comes on, but has some odd quirks out of boost in the lower revs.

    This is the first vehicle I've ever done any tuning on, so I'm still figuring a lot of this out.

  9. #9
    Potential Tuner
    Join Date
    Nov 2019
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    7
    So as an update I'm running open loop all the time now, and after clearing out the LTFTs it runs good. Idles at around 14 afr, acceleration out of boost is anywhere around 12.5 to 13.5.
    When the 7th injector kicks in during boost, it runs too rich, as low as 9.5 when it starts choking itself, but I will tune that out with the Split Second FTC.

    What's the downside to just running open loop all the time?

    And how rich is too rich out of boost? I don't want to wash the cylinders and kill the rings or something.

    I don't see any other way to make this work.