How to adjust fuel trims

dryad001 · Jan 14, 2006, 11:53 PM

I am getting a P0171 code at idle sometimes and at that point my STFT is about 19 and my LTFT is 11, now I know these are way out of wack, how can the maftpro take care of this? I have a log I can post up somewhere, might take me a while to figure out this palm thing. Most fo the time the car drives perfectly but every so often waiting at a red light the idle will drop and my afr's will drop to about 19.0 or so.

To take care of this, can I use the keypad on low fuel settings or will I need to adjust the VE table?

TTP Engineering · Jan 20, 2006, 07:25 AM

Your mainscale adjustment is not correct. Neither is the formula for scaling back injectors that is floating around. Since we spoke about this, I am certain you have it corrected with my advice by now.

dryad001 · Jan 20, 2006, 06:22 PM

So far so good. I have the mainscale set to -16 and on the low fuel I have at

800 -8
1200 -10
1600 -8

it seems to be working a hell of a lot better. Thanks Scott