Ive searched this forum and I know WHAT the STFT are, but I don't understand how they work.
Is it just the feedback between the O2s in CL mode and the commanded AFR. So it will inject the amount of fuel it thinks it needs for stoich, then the O2 lets the computer knows it was off and it can correct by X amount, which is the STFT.
If that is the case, then do fuel trims ONLY work in CL mode? If so why do you have to disable the STFT when you force the car to stay into OL mode?