rcmf5525

OK, I have been fighting with this k10 5.3l swap for sometime now... We have the fuel pressure right where it needs to be, have just replaced the O2 sensors with Denso OEM type... I am still having fuel trim issues... At idle and at rpm... One bank of injectors is being told to run a +50% the other side at -30%... With my handy dandy OBD2 reader, I see the trim and voltage go to zero for both banks when I rev repeatedly, but once I hold a RMP, the voltages go north and south again and the trim is back to the +50/-30... Is it a possible tune issue, wiring, or what?? We are only using bank 1 and 2 sensor 1, so the pre cat O2s... The tune left the post cat O2 sensors on, but they read .440v - .450v, I guess that is normal??

Bowtie316

iTrader: (1)

Sounds like you have the wiring for the o2s switched from side to side.

One side will read lean and try to compensate rich, the other will read rich and try to compensate lean.

rcmf5525

Well damn, don't I feel like a dumb ***... They were crossed... It always seems like it ends up being the simple thing...
Thanks!

Bowtie316

iTrader: (1)

NP, I hope you weren't fighting it for too long.