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Hang on there. Negative LTFT means that the ECU is adding less fuel than its base map would expect. Surely that's a good thing... right?
In a car which has learnt a negative LTFT, resetting the ECU (back to its base map) is going to mean too much fuel gets added in until the ECU re-learns.
I guess it depends whether the error is in the final O2 meter or some place before that. Frames of reference and all that.
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