Took my 2013 LX570 (139k) on a long highway road trip (~2k miles) recently and monitored the short and long term fuel trims during it. I was disappointed to see long term fuel trim hovering around +7 on both banks. My short trim was +/- 2 off nominal. Does anyone else track their fuel trim? Do you see a similar difference between stft and ltft, especially as a lean condition like mine? The only other wrinkle is about a week before the trip I completed extensive maintenance including: full cooling system, spark plugs, air cleaner, PCV, and gasket for throttle body. I would have expected the ECM to eventually normalize after a number of miles and run cycles. Is there an adaptive value reset I can perform?
No check engine lights.
No check engine lights.
Last edited: