Tuners, help with my logger! Messed up MAF Airtemp?

[joeym4130]

I have gotten my logger and am trying to understand/monitor things in my car in hopes of getting an AFC sometime to tune it myself. Also trying to get my idle worked out (its high and real rich), wanted to see if i could use this for clues. I have a few questions on MMcd. I am using it on my 91Tsi. I understand most of the values but need help with screen #3

There are values:

FTRL
FTRM
FTRH
FT02

Those are fuel trims correct?? Low for low cruising and idle, Medium for medium cruising, and High? What is FTO2?? On my logs, FT02 seems to be going crazy, whatever value its trying to log.


Also, my AIRT value is always around 90-93*C?!? Thats like 195*F!?? WTF??!? I suspected a bad MAF? its frickin winter here and like 30*F outside.....

thanks for any help tuners!

 

[joeym4130]

Well nevermind the Air temp question, i think its a bug in the software. I use MMcd tools to export data to excel, and that high of a airtemp is only in excel, not when i looked at it again on the actual palmpilot...weird.

So no one knows what FT02 is?? its a % val thats all i kno, mine jumps around like 99%-110%

My FTRL val is 96% at idle...is that ok? I wish there was a definitive site/article for help with this, anyone have links? thanks guys.

 

[psychlow]

FTO2 is the oxygen sensor trim. It is the amount that the computer is trying to back off or add fuel based on O2 sensor voltage and its hard-coded fuel maps in REAL TIME.

The O2 trim is the ECU's short-term fuel corrections. If the ECU is doing corrections to this constantly over a long period of time, it'll start changing the long-term fuel trims.