I had issues with poor fuel mileage that I think I have corrected. o2 average is .450,+20 ltft,-2 stft. I know 0 ltft is the goal,and I'm hoping I on the right track, but gas mileage still sucks based on instant fuel mileage shown in info area in dashboard in car. With the info above will this have to be driven to learn how to run lean? As in retrained? How long to drive? And what parimeters in programming does the driving/learning process
have to be done before they take effect? I know this is long but 12mpg with minor mods??? Was much better, but changed o2s and do'nt know if pcm is working off old(dead) o2s history.

 

ttt ttt

 

Looks like it as 450 is normally a dead O2. Check their connection.

 

on o2's look at the MAX's.... voltage should be like .800-.870 or something like that...never .450...

I agree with cat3...sounds like a dead or going to be dead soon o2

If you can log the 02 you should see it swing kind of like a sine wave.... if it aint movin...its dead

 

It swings from .10x to .8xx .The original o2s locked at .450. The replacements are working fine. According to the scanner(atap) it also will show average which is .450.I have altered that number by changing ipw offset going from .39x to .7xx average.Found out today I'll need to pull the fuses to reset the ltft. BTW can this reset/learn process be "driven" to correct???