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Thread: fuel trim issues

  1. #1
    Tuner in Training
    Join Date
    Mar 2020
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    14

    fuel trim issues

    so for the last 2 weeks i have had the ltft and o2 readiness turned off got my vve and maf tuned in perfect 14.5 idle 14 light throttle 12.4 wot but when i reactivate my 02's stft stick at -25% and when ltft hit they set at -25 with the stft still at-25 and i got lean to 18-19:1 on my wide band.

    can this be bad o2's from having them shut off this way for so long.

  2. #2
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
    Location
    Rogers, MN
    Posts
    13,559
    Seems doubtful that both sensors just died like that. They still worked while you were tuning, they were just ignored by the computer because you told it to do that.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    Tuner in Training
    Join Date
    Mar 2020
    Posts
    14
    I think I may have found my problem flashed my as found tune back to the car and my fuel trims cleared up to -6 and stft vary between -3 to+3.

    Yet my wide band is saying 17.5 to19 I ordered a new wide band sensor and will hook it up Friday if it?s been that far off I can see why if I was tuning it down I was probably tuning in the 10.5 - 11and around 8 at Wot hope this fixes my issue when I can tune to a correct wide band

  4. #4
    Potential Tuner
    Join Date
    Sep 2019
    Posts
    6
    What's your wideband setup?

  5. #5
    Tuner in Training
    Join Date
    Mar 2020
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    14
    Aem X series with canbus installed in driver side connector pipe no cats long tube headers