fueling problem
- Thread starter ldyzluvdis06
- Start date
uh? what pigtail?
i dont think its valve float (i did order some new springs though) because i have the scans of the fuel dropping off. i dont think throwing a FP gauge on will solve anything because the car is fine until WOT. and ive only got a shitty hand held one, no cabin gauge.
when i partial throttle the fueling goes to like 11-12's (WB) but once i hit WOT it goes to 16's and the 02's go to like 200's
sorry i was askin 10sacOsliders lol
at wot you in boost, if the fuel pres regulator is no longer functioning as a rising rate unit (for 1psi boost it increases fuel pressure 1 psi so at the injector nozzle fuel pressure stays the same) you will lean out...and fast
was the car flashed before it happened? you may have a corrupted bin file, you could flash a tune or two back, into it and retest.
btw if your running the oem l36 rails i dont believe that fpr works well as a rising rate unit...its not designed for pressure...only vac of an na motor...sooo it could be the fpr esp if its old, toss a gauge on man...better to know than guess
at wot you in boost, if the fuel pres regulator is no longer functioning as a rising rate unit (for 1psi boost it increases fuel pressure 1 psi so at the injector nozzle fuel pressure stays the same) you will lean out...and fast
was the car flashed before it happened? you may have a corrupted bin file, you could flash a tune or two back, into it and retest.
btw if your running the oem l36 rails i dont believe that fpr works well as a rising rate unit...its not designed for pressure...only vac of an na motor...sooo it could be the fpr esp if its old, toss a gauge on man...better to know than guess
the car has been running fine for the past 3 weeks with like 13lbs. i loaded the file about a week ago and it was fine until yesterday. i reloaded the tune and cleared the trims and it still happened.
im running a mod'd stock L67 rail.
i posted a WTB for a "in cabin" FP gauge over on CGP. dont really want to shell out the cash for a new one
Just something I thought of while reading this...
If you're floating valves OR misfiring, you're not going to be burning the air you're sucking in, which means it's going to be going out of the exhaust.
What do we rely on to determine whether the car is lean or rich? An OXYGEN sensor, so if you're misfiring or floating valves, and not burning the air-fuel mix, the O2 sensor, wideband included, is going to believe it's experiencing a lean situation, and report accordingly.
Now, I'm not saying for sure that misses or float is causing this, only that it can create a false lean. Scanning for misfires and knock are usually pretty reliable in determining if it's a true or false lean. If you're seeing a bunch of knock, it's probably legit lean, and if you see misfires, it's probably a false lean.
Ready....GO!
If you're floating valves OR misfiring, you're not going to be burning the air you're sucking in, which means it's going to be going out of the exhaust.
What do we rely on to determine whether the car is lean or rich? An OXYGEN sensor, so if you're misfiring or floating valves, and not burning the air-fuel mix, the O2 sensor, wideband included, is going to believe it's experiencing a lean situation, and report accordingly.
Now, I'm not saying for sure that misses or float is causing this, only that it can create a false lean. Scanning for misfires and knock are usually pretty reliable in determining if it's a true or false lean. If you're seeing a bunch of knock, it's probably legit lean, and if you see misfires, it's probably a false lean.
Ready....GO!
A 97-98 MAF in a 99+ throttle body...
Probably leaking boost like a bastard, and really just not working well at all. He's ordered a 99+ MAF though, it's on the way.
or anything about 9psi for me. I was not having any problems with lean issues during valve float though still well in the 900's or 1000's
Yes has been since 2007 just never ran right due to me being a dumbass then having massive valve float and being a poor college student. Then i graduated and had phat put a cam and 130's in and it spun a bearing so its sat since march.
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