I got out the OBDII scanner this weekend to track down an intermittant MIL (turns out to be bank 1 lean condition - damn. why couldn't it have been bank 2?).
Anyway, I am an engineer, and I like to see all that quantifiable data in the engine controller. So OBDII scanners make me feel like a kid in a candy shop, or R Kelly at junior high.
But I don't understand what long term versus short term fuel trim is. Percent of what? % injector duty cycle? What are expected values? I noticed that bank 1 (the problematic bank) values for LT fuel are quite different from bank 2. What can I learn from this, apart from what the MIL already told me?
