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Thread: why are my LTFTs running near -12 but the STFT is around -2 to 3? 07 vette

  1. #1
    Lifetime Member mvvette97's Avatar
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    Default why are my LTFTs running near -12 but the STFT is around -2 to 3? 07 vette

    I thought I had my 07 corvette dialed in perfect. The last time I ran a log it was staying in the -3 range on the long term trims. Today I drove about 100 miles and it ran great. Got home and thought I would just check it and the long term trims were about -12 or more. That said looking at the data it was running about -2 to -3 on the short term trims. It's like the long term and short term trims don't match up at all. What the heck would be the issue here? I hate this e38 computer.

  2. #2
    Joe (Moderator) joecar's Avatar
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    The LTFT's adjust in a manner to keep the STFT's close to zero.

    If nothing in the tune changed, large negative LTFT indicate possible leaky injectors, or leaky FPR.

  3. #3
    Joe (Moderator) joecar's Avatar
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    What fuel are you running...?

    Did you change from E00 to E85...?

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    Lifetime Member mvvette97's Avatar
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    no just using the e10 gas that I have always used. I was quite shocked how the trims were honestly. Car was running great and was getting 30mpg even with the trims like that

  5. #5
    Joe (Moderator) joecar's Avatar
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    Keep an eye on them over time.

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