P0172 and P2197 codes

[aj213121]

Hello everyone, my 2003 trac seems to be stalling out occasionally whenever im at a stop. If it doesnt stall out you can see the rpms dip low and my lights start to dim. I tried changing the IAC and egr valve but no luck. There are no check engine lights and this problem has been going on for months now. Any suggestions?

Edit: Didnt want to start a new post, but in continuation of the problem I finally got a check engine light today. Codes were: P0172 (System too rich (bank 1)) P2197 (02 Sensor signal stuck lean (bank 2 sensor 1)) Im guessing an o2 sensor went bad, but there is a problem on both banks which is what im confused about right now. Any help appreciated, thanks.

 

[david4451]

Possibly your fuel pump, it's working but weak.

 

[aj213121]

Possibly your fuel pump, it's working but weak.

I replaced my fuel pump about 2 years ago... could it have gone bad again?

 

[swshawaii]

Check the PCV elbow. Does NOT always throw p0171/174 lean codes. Top of the ST sticky list.
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Unlikely to solve your stalling, but clean the throttle body and MAF sensor filaments with specific cleaners while in there.

 

[swshawaii]

OP, you should scan for trouble codes anyway. Check engine light is NOT needed to have DTC's stored in memory.

OBD-II Diagnostic Trouble Codes (DTCs)

 

[aj213121]

OP, you should scan for trouble codes anyway. Check engine light is NOT needed to have DTC's stored in memory.

OBD-II Diagnostic Trouble Codes (DTCs)

Checked for codes and nothing is stored on there. PCV elbow is good

 

[aj213121]

Update: still having the problem...checkee my fuel trims and the long term on both banks is at 8%...is that normal?

 

[ssjohns423]

Mine had the same problems, I followed what swshawii said and WALA my idling was fixed. The little rubber PVC elbow on the front passsenger side of the engine gets dry rortted and cracks, usually on the bottom where you can’t see it. I went to O’Reillys and they had one in stock for about $3 it fixed my issue. Good Luck with yours

 

[koda2000]

If you PCV hoses/elbow is okay, it could also be a bad IAC valve. It controls idle.

 

[aj213121]

Bump with an update on first post