Sr20 running lean at idle and under load

[boost addict]

So my sr is running really lean did it out of no where one night when i was pulling away from from a stop sign and i had been driving for like an hour befre that. at idle its running lean and when I try to take off and put it under some load it goes lean and falls on its face but if I just blip the throttle in neutral and it's fine, afr is good an all but when it goes back down to idle it goes lean. I tried a new tps, ive cleaned my maf, I'm getting fuel pressure. Idk what it is, i think I'm gonna try a different maf next. Any ideas?

[steve shadows]

Are you running an EMS like a PFC or a stock ecu? etc etc? I can help you with the mapping if this is the case...

This is definitely tuning related....unless you're running stock ecu it sounds like your fuel pump or fpr is dying...

Thanks! :bow:

[boost addict]

I'm running a nistune, it was just retuned on 7/25 and it started doing it Sunday but for for the 5 days in between it was fine until all of the sudden

[boost addict]

Tried a different maf, same shit...

[mobmotorsports2002]

Are you able to monitor you fuel pressure or just know there is pressure there by unpluging the fuel line? How old is the fuel filter? Aftermarket fpr? Is your fuel pump hardwired with a relay? What pump are you running? I was running a walbro 255 and started going lean so i changed to the areomotive stealth in tank pump with tomei afpr and have beem perfect ever since. I also hardwired my fuel pump with a relay so i don't get a voltage drop at the pump.

[boost addict]

Fuel setup is a 255, not sure how its wired cause it was in the car but i know its on the factory relay, all braided lines with a aeromotive fpr, earls fuel filter that was out on at the end of 2011. The fpr has a fuel pressure gauge so I know it's getting pressure

[boost addict]

My fpr magically turned down so I just had to bump it up a few psi