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Thread: LTFT desired values for idle, light throttle, WOT

  1. #1
    Junior Member
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    Nov 2003
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    Default LTFT desired values for idle, light throttle, WOT

    Hello,

    I am not sure what the desirable long term fuel trim values are
    for (manual transmission, 2000 LS1 engine, F-body):

    1. car fully warmed up, car at idle for several minutes
    (when near stock my car would gradually go to +22...24% from whatever value it was when driving

    2. car fully warmed up, light load, light throttle, say 4th gear going 45 mph

    3. car fully warmed up, WOT (or in PE mode)

    Maybe there is a reference table where the LTFTs are supposed to be versus the fuel cell numbers?

    Thanks,

    Gert

  2. #2
    Senior Member WicketMike's Avatar
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    Nov 2003
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    Default

    the LTFTs are suppose to be -5 to 0 everywhere and 0 at WOT.

    if you where getting +22, then you have a problem. Maybe your MAF is dirty

    98' White TA A4 TSP 231/237 PP Stage II 59cc heads
    401rwhp (unlocked) 1.594 60'-11.60 e.t.-116.98 mph
    ---------
    98' Sport Gold Metallic TA M6 - 13.39 e.t. Bone Stock
    My Trans Ams
    ---------
    2006 Chevy Monte Carlo SS 5.3L LS4 (wifes car) stock (for now)

  3. #3
    Joe (Moderator) joecar's Avatar
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    Apr 2003
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    27,782

    Default

    ...+22...24%...
    Possible causes:
    a. air leak up stream of front O2 sensor;
    b. air leak down stream of MAF sensor;
    c. IFR, VE, MAF tables don't match your mods.

  4. #4
    Junior Member
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    Aug 2005
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    Default

    Mine was at 25% and I found a crack in my intake by the MAP sensor.
    Dale

    78 Datsun 280Z W/LS1/T56

    TR230, Absolute Speed stage II 5.3 heads, Fast 90mm setup, JTR 1 3/4 headers.


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