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Can you help me understand the fuel trims conceptually (or point me to a place where it is explained)? If the car runs slightly lean below 5000 rpm, why am I seeing negative fuel trim? Wouldn't it make more sense it was adding fuel if it runs lean?
I did the MAF scaling logs when it was pretty cold here, only 13-16 deg C. The log above was done at 24 deg C. Was it a bad idea to scale at those fairly low temperatures? The fuel trims here are probably not so accurate since it didn't have enough learn.
Thanks again!
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