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rictrd rictrd is offline

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  1. jfoj
    07-27-2014 07:33 PM
    STFT will move around rapidly, you will need to mentally average them. STFT should probably move between 0% and 5-7% on a good car. LTFT should be in the range of 0% to +3%. Check these both at warm idle and steady highway cruise. Anything above +3% warrants further investigation in my opinion.

    MAF readings, well if the Fuel Trims are close, I would not worry about the MAF readings, most of these cars have warm idle readings in the 4-5 Gram/Sec range. The problem is most of the issues are when the readings are only off by a factor of 10% so this is a really hard and narrow windows to see problems.

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