So ever since I started tuning my car with GC lites and BQ, I have had an issue where either bank #1, #2 or both goes rich post shift. So instead of having an afr of 11.x, it goes to 10.x. Whichever bank is doing it sees a flat lining STFT. It never happens if I just do a 3rd gear WOT pull. It only happens post shift. Sometimes the rail pressure even drops to around 1500psi as seen here:
https://datazap.me/u/asbjoern/22b-competition-water-injection-6?log=1&data=3-20-21
Here's a continuous log with some examples of the riching out post shift.
The problem with this is that it causes power to hesitate slightly, and if I do 20 pulls on track, maybe 1 or 2 of them will also feel like the car misfires post shift. No codes though. I typically lift off immediately when I feel something is not right. My tuner says a bank going too rich can cause misfires.
I have pulled the plugs, and they looked fine, so leaky injectors are ruled out. Adaptations have been reset many times. Injectors are as old as the GC lites and are index 12. Same with primary O2 sensors. The secondary O2s were swapped earlier this year and did not change anything. The HPFP was replaced under warranty eight years ago. The LFPF I replaced last year (OEM Z4). The post shift stft flatlining was there both before and after the LFPF replacement. I have never done a leak-down test on the engine, but the cylinder pressures have been tested a month ago or so, and looked fine. This is the last comment I have gotten from my tuner three weeks ago ago:
"Something causing you bank to go rich, so the o2 senors (both banks) comes to mind now"
Could it really be that the primary O2 sensors have been bad from when they were installed from new two years ago?
Could a boost leak after the tmap be causing it?
https://datazap.me/u/asbjoern/22b-competition-water-injection-6?log=1&data=3-20-21
Here's a continuous log with some examples of the riching out post shift.
The problem with this is that it causes power to hesitate slightly, and if I do 20 pulls on track, maybe 1 or 2 of them will also feel like the car misfires post shift. No codes though. I typically lift off immediately when I feel something is not right. My tuner says a bank going too rich can cause misfires.
I have pulled the plugs, and they looked fine, so leaky injectors are ruled out. Adaptations have been reset many times. Injectors are as old as the GC lites and are index 12. Same with primary O2 sensors. The secondary O2s were swapped earlier this year and did not change anything. The HPFP was replaced under warranty eight years ago. The LFPF I replaced last year (OEM Z4). The post shift stft flatlining was there both before and after the LFPF replacement. I have never done a leak-down test on the engine, but the cylinder pressures have been tested a month ago or so, and looked fine. This is the last comment I have gotten from my tuner three weeks ago ago:
"Something causing you bank to go rich, so the o2 senors (both banks) comes to mind now"
Could it really be that the primary O2 sensors have been bad from when they were installed from new two years ago?
Could a boost leak after the tmap be causing it?