Fuel trim and O2 problem

[Evil1gDsm]

I've been having an on going battle with my fuel trims and 02 readings! I'm having to add 20% fuel on my AFC-2 to get my 02's to cycle at idle! I have all the supporting fuel mods! Well i've tried everything; Swaping out the ECU, MAF, and 02 sensor. Well today i "un-hacked" my MAF and didn't have it plugged into the car! Then my 02's cycled fine! I need your help guys...Dan

 

[Fattie92]

I have heard bad things about FIC's .... only thing i can think of at the moment....

 

[Fattie92]

i want to check your timing again.

 

[1LE]

Your problem may go away when it warms up outside. I have the same problem when it drops down near freezing. Gets below freezing and I completely lose the idle too... It's really odd, the O2 will just read 0 just above freezing. Drops below freezing and the O2 sits at .98. Weather gets warmer and the car runs fine, O2 cycles fine... Frustrating.

 

[Fattie92]

Your problem may go away when it warms up outside. I have the same problem when it drops down near freezing. Gets below freezing and I completely lose the idle too... It's really odd, the O2 will just read 0 just above freezing. Drops below freezing and the O2 sits at .98. Weather gets warmer and the car runs fine, O2 cycles fine... Frustrating.

...its spring... Not winter. It hasent been freezing for a while, its been nice out. His problem is a little more complicated then "the weather."

 

[Evil1gDsm]

that's true...Me and Ryan have tried everything...Swapping out ECU's, O2 sensors and MAF's! Nothing seems to be working..I shouldn't have to add 20% fuel at idle to get my 02's to cycle!!...grrrrrr...dan