Diagnostics report for THP 1.6 207 gti
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  1. #1
    Tadpole
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    Default Diagnostics report for THP 1.6 207 gti

    Ran the diagnostics report as per instructions.
    STFT was 0
    LTFT was 9.38

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    What do those figures mean and are there any other relevant ones I should post?

  2. #2
    Member
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    Short Term Fuel Trim
    Long Term Fuel Trim

    If you have a positive number, the computer is adding fuel to richen the mixture because it senses the engine/bank is running lean (more air)

    STFT of zero is where is needs to be

    LTFT 9.38 (I assume thats percentage?) means the computer is adding fuel and remembering over a long period of time. A cause for an error code might be programmed to appear at 15%+-

    LTFT will memory will help bring the STFT either up or down to zero and LTFT remembers as the constant.

  3. #3
    Tadpole
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    So engine seems healthy based on those?

  4. #4
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    The etuners site comments on this engine state that a long term fuel trim of >+10% is indicative of retarded valve timing.

  5. #5
    1000+ Posts dmccurtayne's Avatar
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    All fuel trims should be close to 0 you have a vacuum leak or the such


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  6. #6
    Tadpole
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    Could it be the timing is out? The chain is going to be replaced soon as tensioner is shot and chain stretched.

    Also if LTFT is back to 0, does performance improve or is this totally unrelated?

  7. #7
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    If the chain stretches the cam sprockets will retard. The engine computer will try to make it up.

  8. #8
    Fellow Frogger
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    Quote Originally Posted by dmccurtayne View Post
    All fuel trims should be close to 0 you have a vacuum leak or the such
    Possibly the engine cover (PCV diaphragm) and matching intake pipe also required with the timing chain?

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