whats causing ltft to shoot up at idle? Car all of a sudden went rich at idle, scanned it today and it showed the fuel trims rising as high as 36 at idle! I am kinda new to this so where should I start? maf was reading 2900 & 10.00gm/sec mapkpa=72 volt 3.30 iac pos=60-80. This was off a snap on scanner. |
can someone turn me in the right direction |
If the trims creep continuously over a span of many seconds, to minutes, at idle this may be O2 sensor cooling related. If it just steps into a lousy looking LTFT and stays put, that's an airflow or fuel delivery inaccuracy. Creep, or crappy from the get-go? |
MAP is really high, unless you have a gigantic cam. sounds like an intake leak to me |
THe cam is a ms3 so kinda big, the trims creep up slowly, the car starts fine and idles fine right away and the longer you let it idle the worse it gets. I watched the fuel trims climb and climb. Could this be caused from running leaded race fuel? Could I have fouled the 02's? |
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