i keep getting a lean code no matter what i do with the tuning. i have a WB on the car and the only time it shows lean is when the car is cold at idle. it has not effected the performance of the car, but it is annoying and i would like any help i can get to resolve this...

here are my mods:

Vishnu XEDE - XFLASH
Vishnu turboback exhaust
HKS 264/272 Cams
Buschur Upper intercooler piping (with stock airbox K&N drop-in filter)
Buschur Mini Battery
Walbro Fuel Pump and 660 Injectors

 

front 02 sensor could be bad...

 

Yep. Sounds like the front o2 sensor is bad or damaged.

shiv

 

me 3

 

why would it still be able to read stoich once it warms up?

 

Really? Then it is probably fine. The only other thing that would induce a lean run code is if the short term fuel corrections are too far on the positive side during cruise. You can fix this by adding a positive fuel offset (positive number) in those particular cells in the fuel table. You will need some sort of OBD-II reader to read short-term fuel corrections though.... it's an unusual problem to have but i have seen it before.

shiv

 

thanks for the input shiv! i will try it and let you know what happens...thanks

 

I've also seen this. I also have cams.

I've notice I get it if I idle too long, 8+ min. Usually does it when I warm up the car when it's cold out.

Doesn't happen very often. But I think it's a combination of increased duration of the cams and being in open loop at cold start.
MAS see's increased air coming in and extends the duration of the injector + being in open loop throws off the fuel trim. ECU tries to compensate but to much so it triggers the light.



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shiv,

i figured out a couple of things that i wanted to share because i have been playing with the cam gear settings just to see what happens:


1. i have 264/272 cams, and with the gears set at -3/-1 along with adding a little fuel the lean code went away on its own...car runs great except does not have the top end that it did with the cams set to -2/-2

2. with the cams set at -2/-2, it does not matter how much fuel i add, it does nothing, and i have figured out the reason...but here is one more peice of information that will make a difference, i have a 1G recirculated BOV...at that cam setting, at idle there is not enough vaccuum for the BOV to operate correctly, therefore the idle is rough and it surges and stumbles at low RPM's...


so here is the question, what can i do with the cams to help remedy this problem, but not lose the top end?

 

i have also the lean code,my mods are :worksP2,269,700inj,10.5etc.ialready change the o2 sensor,talk to works any times they cant solve the problem.all i want is a road tune by pete,any way planning to add safc

 

recently I have also been getting P0171 and P0300
which I never got before my Dyno tune