Rydrdg

Any ideas to fix this? driving feel normal. Im turbocharged.

java09

what is that lean fuel trim 2? i know p0171 is lean fuel trim 1... what i guess it means is your running lean at cruising. what are your afr's at cruise speed?

Rydrdg

code PO172 say bank 1, lean or rich. I dont have afr gauge.

java09

just sounds like your tune. are you pro tuned or self/street tuned? if you are jsut richen up your fuel map and you should be fine.

what management unit?

Syldrin

iTrader: (1)

You're running to lean. be careful. i got this code last thursday when i got on my car. haven't been on it since. you need bigger injectors.

Mr_Meaty

um...if your boosted, you REALLY should have an AFR gauge...

Syldrin

iTrader: (1)

now that i look at his profile. he's probably building boost at partial throtle and it's throwing his ECU off because he has an ultimate emangle

java09

^^concur without comment.

north korea's allies have done all the work here..

java09

ultimate can tune partial throttle correct? or is the black box needed?

Rydrdg

I am pro tune,

griff

I am having the same problem. I am not tunned because I do not want to spend $600 and still have the same problem. What kit r u running??

Rydrdg

greddy kit

Ace83

iTrader: (6)

they said even the blue can but I dunno bout that.. I know our ecu has a very smart close loop operation.. When I used my black box, it was an easy piece mind making the part throttle afrs richer, how's it treating you java?

PS Im selling 2 blackbox if anyone interested..

Syldrin

iTrader: (1)

as far as i know you need the dezod box for partial throttle. this would be a good thing to ask one of the boy's at dezod.

Rydrdg

thanks, for the help, I recirc bov problem went away an pass emission test.

java09

^^sweet brother!

go out and enjoy all over that evo!!! hahahaha

Ace83

iTrader: (6)

nice so its just the recirc that did the trick?

08superwhite

maybe it's just me, but then i think that would mean that your bov is leaking

Mr_Meaty

no...what's happening is when the BOV goes off, all the metered air goes out and the fuel that the ECU has already pushed to go with that metered air makes the car run supper rich, which triggers the 02 sensor to think your cat's not working which throws the code.
This is why they say you SHOULD be able to clear your code, go to the station without hitting boost and pass smog.

garabaldy

The CEL your talking about is during closed loop operation. If the short term fuel trim makes a major adjustment to the long term fuel trim then it throws a CEL. If you clear it and it doesn't come back then NP but if it does come back then pro tune with a scanner to read fuel trims , if you can tune closed loop - see above.