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Thread: Miss at 5200 rpms

  1. #1
    Tuner in Training
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    Jan 2017
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    Miss at 5200 rpms

    Have a 15 ProCharged challenger 6.2 having a problem when i bring rpms up boost or no boostI get a miss last for aBOUT A MINUTE AND GOES AWAY starts at 5200 and continues wether on throttle or not.so did another log with my HP tuner this time I added injector pulse width and from what I can tell #3 and #7 pulse is reading zero when the problem happens and engine shows lean for 1 minute then it just goes away and all is good
    \Does anybody have any ideas
    It has new
    New ECM
    Spark plugs
    All sensors new
    Injectors cleaned and tested
    New coils
    New fuel pumps
    New fuel filter and tank cleaned out
    Compression and leak down tested
    Thanks for any help
    Chuck

  2. #2
    Senior Tuner
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    May 2015
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    1,909
    post log...and tune...we go from there.

  3. #3
    Tuner in Training
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    Log file

    Log File 11.hpl
    Hope I did this right
    Chuck

  4. #4
    Tuner in Training
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    ECM read


  5. #5
    Tuner in Training
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    Forgot running E-85

  6. #6
    Tuner in Training
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    Tried a new engine harness today made no change. Anybody have any ideas have tried every thing I can think of I’m at the end of my rope I don’t know what else to do.
    Chuck

  7. #7
    Wiped Cam? Seems to be often enough in my experience.

  8. #8
    Could pull valve cover and use a micrometer on valves to see how far they open and close and compare to one cylinder that does not misfire.

  9. #9
    Tuner in Training
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    Pulled valve cover checked travel all looks good hard to measure up and down measurements no real way to put micrometer on rocker or valve spring keeps walking ? But travel looks good

  10. #10
    Quote Originally Posted by chuckray View Post
    Pulled valve cover checked travel all looks good hard to measure up and down measurements no real way to put micrometer on rocker or valve spring keeps walking ? But travel looks good
    I checked the logs and it doesn?t seem like the car is going into power enrichment ? The commanded lambda stays at 1 through out the pull why is that?

  11. #11
    Tuner in Training
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    Not a tuner I’m a Ford heavy line tech I pay to have my tuning done
    So to answer your ? I don’t have a clue could that be the problem ?
    Chuck

  12. #12
    Tuner in Training
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    Dont know if anybody noticed on the log bank 1 02 sensor doesnt seem to be working when problem happens
    Thanks
    Chuck

  13. #13
    Quote Originally Posted by chuckray View Post
    Dont know if anybody noticed on the log bank 1 02 sensor doesnt seem to be working when problem happens
    Thanks
    Chuck
    doesn't cause a difference as wot is openloop

  14. #14
    Tuner in Training
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    its only at 30% TPS signal