Logging with Evo scan 2.5 or Mitsulogger my fuel trims dont move, idle hunts a lot 14.8 to 17.4 A/R after warm up with load (AC or Lights). Changed front o2 sensor makes no difference but if I unplug o2 sensor idles fine, A/R 15.3. I did not find any leaks. This started happening after my battery went dead for week or two.
Any ideas guys?

Mods are, GM 3" MAF with MAF Translator, stock ECU and scaling, walbro 255, 880cc injectors, Fuel Labs regulator, Comp 272s, Ultimate Racing GT35R bb,
3" exhaust, Bushur COP, ETS intercooler pipe kit, and 4" intake.

Thanks.

 

what are your fuel trims?

not sure about your MAFT - hopefully someone that knows can chime in

 

Thanks for the reply Tephra, my fuel trims are 0.1008, the car hunts but seems to idle better when I disconnect the front o2 sensor( which is brand new) it did the same thing with the old sensor also. I will attach my ROM. if that may help. It idled
pretty good on the 96940011 rom. I cant find any vacuum leaks, running out of ideas.
Any help greatly appreciated.

Using the Tephra v5.10mod for 96530006.

 

what is your o2feedback saying...

I believe razorlab also had the problem where fuel trims wouldn't change.

o2feedback should give you some ideas as to your trims

 

o2 feedback 0.304volts for both sensors after playing around with the MAF-T.

 

My rom is 117kb zipped too big to upload.

 

your o2feedback should be a % and also be jumping up and down quite a bit..

 

sorry was thinking of the o2 sensor. o2 feedback does not move 0.1008%.

 

hrmm thats bad.

ok what does your front o2 voltage show? static or changing?

 

or maybe you are never going into closed loop?

 

Its changing.

 

Why?

 

because your trims arn't changing...

what do your openloop load AND TPS #1 and #2 tables look like?

 

I have attached both tables.
Thanks Tephra for your help, you are the only one who tried to help me.

 

ok so they are stock.

hrmm what about the open loop tps tables?

also what about "min temp for closed loop" or something like that...

no worries - its busy time of year for most ppl - so yeah