2G Can't target stock afr

[sharky559]

Need help. Well my car got sent to raf. (California). The car is now bone stock. I'm having problems with the afr. It's at 13:0-13:9 some times 14. What could be wrong. ..

 

[1990dsmkid]

Are those numbers during idle or while driving? Need a little more info but for idle you want around 14.7.

 

[sharky559]

Are those numbers during idle or while driving? Need a little more info but for idle you want around 14.7.

Sorry but it's at idle

 

[1990dsmkid]

Yea your a little rich. I know you said car is bone stock but are you sure nothing has been changed?

 

[sharky559]

Yea your a little rich. I know you said car is bone stock but are you sure nothing has been changed?

Yeah it bone stock. ... okay this is what I got so far with the ac on full blast I get 14.2-14.6 with ac off 13.6-13.8

 

[Derail20T]

Do you have DSMLINK? If you do, you can log to see if you are in closed loop at Idle. If you are stuck in open loop, then the computer won't target a 14.7:1 afr. There are a number of reasons why it would be stuck in open loop including a bad O2 sensor. If you don't have DSMLINK, you could scan for cel codes to see if something isn't functioning properly.

 

[sharky559]

Okay I've been working in the car... and I didn't see that the o2 was not cycling let it should. So after some playing around with the fuel pressure regular. I got the o2 to cycle. . I had to turn up the pressure. . I'm starting to think that the fuel pressure regular is bad....

 

[Vestic]

Tossing on a new AFPR is never bad idea, plenty of vendors have pretty reasonably priced kits.