CAT3

iTrader: (9)

Ok, Understand Torque Management, and COT, and even the Low vs. High Octane tables.

But what is LTFT's info, how does it relate to tuning issues?

Also, what A/F ratio does 940mv (left side) 950mv (right side)equal. and which way is leaner, smaller mv # right?

TIA. Charlie.

Cal

iTrader: (1)

LTFT = Long Term Fuel Trims, make them -8 at part throttle (18%tps.) Leaner is smaller mV. That's a good reading but it really can't be related to an AFR unless you are using a Wideband O2.

CAT3

iTrader: (9)

CAL, what or how does this relate? LLMF on this one. And it is normal for one bank to be slightly higher right????

TheDogofWar

iTrader: (2)

LTFTs are an average of STFTs (short term) they are the value of correction the PCM is making to keep you at a constant 14.6 A/F.

If the values are (+) then it is adding fuel to correct a lean condition and vise versa.

If you go WOT while the LTFT value is (+) the PCM automatically assumes you will be lean and will add a predetermined amount of fuel (based on the LTFT value) above and beyond what the PE table calls for.

If they are (-) no fuel will be added, taking one less variable out of your tuning.