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Thread: Jeep tuning master thread

  1. #21
    Tuner in Training
    Join Date
    Oct 2023
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    16
    well hopefully I didn't just waste $50 on a credit for this, but I am having an issue writing a tune to my Jeep ECM, it gets past the radio warning, ign off, ign on, then when it gets to the point of erasing it says that it aborted, and write failed or something like that.

    according to the vehicle compatibility list the 97-04 wrangler 4.0 is supported by the MPVI3 or at least that is what I am led to believe since there is not a (2) after the vehicle type.

    any ideas?

  2. #22
    Quote Originally Posted by Gordon-0 View Post
    well hopefully I didn't just waste $50 on a credit for this, but I am having an issue writing a tune to my Jeep ECM, it gets past the radio warning, ign off, ign on, then when it gets to the point of erasing it says that it aborted, and write failed or something like that.

    according to the vehicle compatibility list the 97-04 wrangler 4.0 is supported by the MPVI3 or at least that is what I am led to believe since there is not a (2) after the vehicle type.

    any ideas?
    I kind of gave up on my jeep. Just figured my CEL and poor tuning from Chrysler is just a forever thing on these Jeeps. LoL. I get the same message. I was thinking about sending in my mpvi2 to upgrade to the mpvi3, so I might be able to tune my jeep, but it looks like the mpvi3 doesn't work either.

  3. #23
    Tuner in Training
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    Oct 2023
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    16
    it finally worked for me using the beta software to write the tune.
    reading the tune works fine in the regular software.

    question: for timing, there are 3 tables, "main spark (egr off)", "main spark (egr on)", and "warm spark".
    I would assume that warm spark was the table to use, but the values to "enable" it make no sense.

    warmsparkthresholds.png

    looking at the values, warm spark will be used between 8c and 40c, then turn off until 90c ?
    is this right?

    also, while datalogging, is there any way to tell which table the ECU is using?

  4. #24
    Potential Tuner
    Join Date
    Mar 2024
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    2
    Great thread. I have a supercharged 2005 Jeep Rubicon. I am told and believe its running lean. Just bought a MPVI3 and am starting to do some logging. I have an exhaust leak that I am fixing with a banks header which I am having drilled and welded for a wideband sensor. Not planning on doing any tuning until I get the new header on and have plenty of logging time on it. Just wanted to say hi, and share my experiences here in the journey so it might help others. The jeep runs well, but I am sure there is plenty of room for improvement now that there is a tuner that supports my jeep. On recommendation in another post, I bought the Engine Management Advanced Tuning book by Greg Banish. I was happy to find it had a pretty good section in there on superchargers and turbos. Trying to get up to speed (pun intended) on all this so I am not asking stupid questions.

  5. #25
    Quote Originally Posted by scottie1134 View Post
    I kind of gave up on my jeep. Just figured my CEL and poor tuning from Chrysler is just a forever thing on these Jeeps. LoL. I get the same message. I was thinking about sending in my mpvi2 to upgrade to the mpvi3, so I might be able to tune my jeep, but it looks like the mpvi3 doesn't work either.
    Well, after about a year of not really caring all that much, I finally flashed my jeep with the new MPVI3. It works. Turns out, for me, the MPVI2 was the problem the whole time. Fortunately it's only 1 credit to flash these older modules, so I just assumed I was out $50 or something. And a little bit of frustration. The jeep tuning is absolutely awful. I ended up picking up about 40 ft lbs down low and about 30 hp up top. It's whole different jeep now. Throttle response is actually a thing now. I wish I could do some trans tuning, but the scanner doesn't show output shaft speed. So I don't know if it's worth it to find another logging program to read trans output shaft speed in attempts to make changes there. But I'm pretty stoked about finally being able to enjoy my header and intaker. And no more CEL... so far

  6. #26
    Tuner in Training
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    Jun 2024
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    13
    Hello , I have a supercharged jeep 4.0 , 36lb injectors and a 2.5 bar map sensor. It currently idles at 9.0 afr is there any ways to scale the map sensor for 2.5 or should I just be adjusting my afr in the power enrichment table ?

  7. #27
    Potential Tuner
    Join Date
    Feb 2024
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    4
    Hi new to tuning. 2005 Wrangler with fully rebuilt 42RLE also. Just got the MPIV3 and changed the 4.0 to a 4.6 which resolved my running rich. Fuel trims are back in line. I seem to have no power when I try to get it to drop a gear going about 55. I'm assuming I need bigger injectors and it looks like 24lb should be good enough. Very mild build sourcing parts from Russ and a comp cams 4x4 cam. I'm trying to find details on what calculations and tables I need to change for injectors. I've haven't even looked at how to change settings for the cam. From what I have gathered these computers don't offer a lot and aren't comparable to tuning an LS. I'm new to tuning, so if someone can point me in the right direction that would be much appreciated.

  8. #28
    Potential Tuner
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    Feb 2024
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    Attaching stock 2005 Wrangler tune here for others.

    2005JeepTJ_factory.hpt

  9. #29
    Tuner in Training
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    Jun 2024
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    Here is what I'm confused about iSnapchat-529241876.jpg

  10. #30
    Potential Tuner
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    Feb 2024
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    2005 Jeep Wrangler 4.6 I6 Stroker (wife's Jeep)
    2004 Jeep Wranger LJ 5.3 LS Swap in progress
    2018 GMC Sierra L5P to be tuned eventually

  11. #31
    Tuner in Training
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    Jun 2024
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    I watched his videos a few days ago. He uses a Honda 1.9 bar map sensor and set is multi to 190 along with map sensor min and max that's what I'm trying to figure out

  12. #32
    Potential Tuner
    Join Date
    Feb 2024
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    4
    I had two different issues. First was a bad PCM which caused all sorts of weird issues at idle and low speed reversing. Second was a bad fan clutch causing it to overheat. I'm all figured out until we order some bigger injectors, as it at times seems to need to add fuel, But it's mostly 0/-1/-2 of short term trims.
    2005 Jeep Wrangler 4.6 I6 Stroker (wife's Jeep)
    2004 Jeep Wranger LJ 5.3 LS Swap in progress
    2018 GMC Sierra L5P to be tuned eventually