ok so i posted a thread about a fuel filter and aparently we only have the little filter on the fuel pump. the problem is that ever since my aquamist kit was installed and tuned (sept), i have been poping the P0171 code. im really getting sick of haveing a car that is undrivable. so i look at all the possible problems and the only ones i havent checked are....

1. have not replaced the front 02 because its $240
2. have not checked fuel pressure (any way i can do this without a gage?)
3. have not checked to see if the injectors are clogged(i doubt it because the car runs great when the code is cleared and @ WOT.)

now this was posted by my buddy in the last thread and explains a lot....

like he said, the air/fuels are just fine when driving, 14.6-15.1. WOT they are 12.0-11.8(i have alky remember), and idle they are 14.7-16.0 ish. now like he said, if i slowly let off the throttle, the numbers will go from perfect to the gage reading --- when i am completly off throttle. this is normal i am presuming.

so any help would be great.

 

anyone?

 

I have a IX MR, and after adding the mods in my sig started getting the P0171 code - "System too Lean". I sent the ECU back to Dynoflash and just got it back finally yesterday, and now it is throwing P2195 - "O2 Sensor Stuck Lean". I don't have any meth or anything like that but have the same problem. I still think it is the tune...

 

Try another tuner and a new o2 sensor.

 

i do believe its my tune as well. it all started to happen right after my meth was installed and tuned. i think what happened (not sure) was the tuner took some fuel out to compensate for the meth, and too much was taken out down below and the large 780cc injectors arnt spraying enough. i think the fuel trims need to be adjusted a little.

when im sitting there idleing, the car will go from 14.6 to 16.0 a/f. it should only deviate +-.5 points. while cruising im fine at like 14.6-15.3, and WOT is fine as well. so im going to talk to the tuner and see what he thinks because i have changed nothing and this has been going on since late sept.

only other thing i can think of is a bad 02.

 

Who tuned the car?

 

i would rather not say. im sure the tuner will fix it no matter what so i dont want any asshats coming into this thread and starting crap.

 

Either your tune is super lean or your o2 sensor is toast. If it's Al then your tune is not lean cause Al definitely doesn't tune lean

 

02 sensors are a wear item. How many miles are on the car? It may be time.

 

You can purchase the Bosch universal o2 sensor from your local autoparts store for about $80....just make sure they look it up in the computer to match the Evo since there is a few variations of the universal sensor....

I have been using one on my car for over a year now with no issues what so ever..(i burnt up my OEM sensor by running to much leaded race gas through it)..i also have a buddy of mine that has used one on his Evo IX (stripped out the OEM sensor putting on a new o2 housing) and he hasnt had any issues either....

Good luck...

 

I think in my case it very well may be that the sensor went out. The car has 30k miles on it. I sent my ECU back in to Al at Dynoflash, and he checked out everything he could, and the light came back on within an hour of putting it back in, so it must be something mechanical.

I will look into the Bosch one. Are these easy to install? I can do easy things myself, but I am definitely no mechanic.

 

ok guys here is the deal...

last week i went to the local advanced auto and had them look them up for me.

the guy found 3, all bosch but one was different. 2 of them were $235 and supposedly came with the wire and all connections. the other one was $65 but i was told u had to cut off the old 02 and splice the new one into the old harness.

now thats something i dont mind doing persay, but he told me specificly not to get this one because they never ever work.

now mitsu wants $250 for the stock one. i also found this....

http://www.autopartswarehouse.com/de...Q25024631.html

anyone ever use or herd of this brand?

 

Its the tuning, not the o2 sensor.

THE TUNE

Injector scaling and latencies are not correct which I am sure is just teh tip of the iceberg with that tune.

 

so ur saying save my money and bring it back to my tuner?

 

I would go back to him first. He's always willing to help out