Can't figure out rich condition
I have a log of a 2014 5.3 E92 which is attached. The issue is randomly the LTFT go really rich and set code P0174 and P0175 which is rich on bank one and two. I don't see anything in the log that would show something is funny, but clearly at the end of the log you can see the trims go to -30.
It is hard to catch when this happens but it seems to set the engine light when it has been idling for a couple minutes when the engine is warm.
Any tips on something else i should be logging to look for the culprit?
Or has anyone else experienced similar situations? I have changed plugs, wires, and 02 sensors and it is still randomly going rich. Thought maybe the high pressure fuel pump was crapping out but you can see the pressure remains good. Also under WOT it holds pressure as well. After this log i have added the maf raw frequency PID, but the mass air flow doesn't seem to change when this rich condition occurs.
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