Vehicle: 1998 Pontiac Firebird Trans Am Convertible LS1
Mods: SLP Lid, Cold Air Scoop, K&N Air Filter, LS6 Intake
Symptoms: Car is a little sluggish, big loss of power after 3000 rpms
Engine is throwing 4 codes: P0131, P0137, P0151, P0157
which I believe is saying all four oxygen sensors are reporting that it's running lean
I just got the fuel pump replaced about 3 weeks ago, because of the same problem. The symptoms seemed to have gone away for about a week. I then figured i would get the fuel filter replaced just to rule that out. Still running lean.
I decided to run a scan on my car to get a better insight in whats going on. Note, this was all done on a stockish tune, the only real change was transmission shift pressures and coolant fan temps. (I also tried the stock tune and still was running lean)
I haven't been able to check the fuel pressure, but if it was low, wouldn't the injector duty be high?
The first run has a few punches at WOT and the second run was idling in closed loop. These were both done using the default imperial config. When watching the closed loop scan, i noticed the STFT were constantly compensating for running lean. Can someone make sense of what is going on here? Maybe it's a bad sensor somewhere?
Thanks to all in advance