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Thread: How do I get rid of large negative fuel trims?

  1. #1
    Tuner in Training
    Join Date
    Sep 2021
    Posts
    21

    How do I get rid of large negative fuel trims?

    Nothing mechanically wrong with the vehicle.
    On logging I have -20 to -30 short term fuel trims.
    The long term fuel trims are also creeping up on the negative side.
    For someone whom does not know tuning, me, can you give me the easiest way to get rid of these large negative fuel trims?
    Step by step including which tables to use.
    Thanks in advance.

  2. #2
    i followed this to graph the lt+st and modify as needed (usually VE if your injector data is good), https://www.youtube.com/watch?v=Rhg5NSh8Dq8

    i pull the pcm fuse for 10s and that resets the LT to zero.

  3. #3
    Advanced Tuner
    Join Date
    Nov 2017
    Posts
    803
    Your injector data needs to be correct.
    If in doubt, multiply everything by 1.1.

  4. #4
    Tuner in Training
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    Sep 2021
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    21
    Appreciated men

  5. #5
    Tuner
    Join Date
    Jan 2021
    Location
    Miami
    Posts
    150
    how would i accomplish this without ltft? i only have stft.and im using lt headers and not to sure what needs to be changed because of where the o2's are further away that stock? my trims are -/+ 22 cant get idle to be stable yet.
    By the prickle of my thumb something wicked this way comes!2008 Chrysler 300c! 2013 heads/220/230 comp cam/LTheaders/FTI 2600 stall converter.

  6. #6
    Advanced Tuner
    Join Date
    Nov 2017
    Posts
    803

  7. #7
    Tuner
    Join Date
    Jan 2021
    Location
    Miami
    Posts
    150
    ive heard a few bad reviews on these books. all said they wasted their money.
    By the prickle of my thumb something wicked this way comes!2008 Chrysler 300c! 2013 heads/220/230 comp cam/LTheaders/FTI 2600 stall converter.