I'm looking at the values on a 99 bmw 540 and the additive mixture (idle) is 1-2% on both banks and the multiplicative mixture (slight throttle) is 11-13% on both banks. I am pretty sure these are bmws fuel trims.
In global obd2, I get 13-15% ltft and around 0% stft.
The ltft only gets better with a heavy load, not rpm dependant and doesn't respond like a typical vacuum leak.
I would think the the idle mixture would be high with a vacuum leak too.
Could the difference in numbers have something to do with it being in open loop at idle and decel?
Imbgoing to test the fpr tonight to see if it's stuck open.
Login below to reply: