Look at my log, i don't think my afc is working

[Mitsu_Racing]

This is a log i took at idle, i went from -50 to +50 and basically no changes in the numbers. Does this mean my AFC is adjusting? I've checked the wiring over and over and everything looks good. All the connections were soldered. Any help is appreciated.

 

[CanadianTSi]

Looks like your o2 sensor is dead.

In order to see if your adjustments are doing anything you would need to watch your Short term fuel trim. But even then going from -50 to +50 the car should either die or sound drastically different.

 

[Quasimondo]

Are you getting any CEL's? Is your AFC properly set up? Cylinders at 4 (or 2 if it's showing half of what your actual engine speed is)? Sensor type set for Karmen? Throttle set for the up arrow?

Go to your monitor settings and monitor these three parameters: Karmen, Throttle, RPM. What the SAFC sees should match what your logger sees, with the exception of the throttle. Your logger may read 10% when the throttle is closed, while the SAFC shows 0%. Your logger may show a different value from the SAFC as well since the logger will be seeing the corrected value if you haven't returned the corrections to 0%. If your safc doesn't match what your logger is seeing, then there's a problem with either the wiring or the initial settings.

 

[spyderturbo007]

Did you remember to cut the MAF wire at the ECU? Some people just tap into the wire and never cut it. Normally their logs look like the one you posted.

 

[Mitsu_Racing]

Wow i can't believe i've had this car down for over a year and the problem was i had the AFC set to pressure instead of karmen. I thought i checked it but i guess i never did. Well now on to some tuning. Thanks alot for your help guys.

 

[spyderturbo007]

Cool.......Now it's on to WOT pulls. Make a 3rd gear pull from 2.5k to redline logging airflow, O2, timing and rpm.