Thread: hittin a wall here

well i cant seem to figure this damn issue out. long story short I swapped out my 36lb injectors to 46lb injectors and my trims now lock in at 16.4 at idle and cruise and 10.5 at wide open throttle no matter what i do in my tune. no leaks that i have found, replaced the O2 sensor, the wideband doesnt correlate with the narrow band. I did a scan tonight for you all to see. please help!

fueling issue 1 from impalamike3800 -- Scan Depot dot net

you have a vacuum leak. it may be very small, but it is still there.

see i would agree with that if it werent for the fact that this happened right after i changed my injectors. when i ran the 36lb injectors trims would lock to 0 every time.

if you reset the trims and then watch the LTFT do they just climb until they stay static at 16.4? that would be a vacuum leak and youll need to find it.

did you put in the conversion so your car is actually running the correct fueling for the injectors or did you just switch them and hope to be golden?

ya i changed the IFR table. id post my bin file but zipped it is too big.

here is what my 36lb injector table looked like for IFR:
mSec/Gram
kPa 0 227.6890766
kPa 10 225.0143151
kPa 20 222.0052083
kPa 30 216.9900304
kPa 40 215.9869949
kPa 50 215.9869949
kPa 60 215.9869949
kPa 70 215.9869949
kPa 80 215.9869949
kPa 90 214.0113187
kPa 100 213.0082831

and now my 46lb table i am currently running:

mSec/Gram
kPa 0 178.1914513
kPa 10 176.0981596
kPa 20 173.7432065
kPa 30 169.8182847
kPa 40 169.0333003
kPa 50 169.0333003
kPa 60 169.0333003
kPa 70 169.0333003
kPa 80 169.0333003
kPa 90 167.487119
kPa 100 166.7021346

the formula i used was (36/46)*IFR

i dont know the conversion youre supposed to use so i cant even tell you if that is right.

Check your O-Rings in the injectors and how your fuel rail is sitting. I couldn't find a leak of my own one time and one of the O-Rings was sitting off a bit and was causing fuel to sip out from the top.

You ever figure this one out?