Is it normal to see a rich mixture trying to happen on decel for a E92A ECM? At first I thought it was my VVE or MAF, but honestly it does it no matter the values. But the STFT tries to pull the fuel back out. usually 15% rich or so. I try to filter it out in my logs, but curious if this is just a normal thing for these models and if I can disable that somehow? I will get a log and tune posted up shortly to better explain too.
I could understand one bank rich if I had an injector leaking, or both banks lean from a vacuum leak. I also have gotten a chirp sound on light load around 1200RPM which I am guessing is a tiny exhaust leak, but I have been unable to find it.