Hi.
I made a 2 bar COS to this 12216125 -> 1252013 5.3 truck PCM and also enabled flexfuel.
Flexfuel sensor is showing the alcohol% and all seems to work fine if I command to open loop. Now there's 8% ethanol in fuel.
Narrow bands show very rich and the car won't stay running when in closed loop. Wideband shows 11 AFR quite steadily.
I took 30% off from the VE with no luck. The WB still shows 11 AFR. I repeated that by taking another 30% off and still the same.
Injectors are Siemens Deka 80lb FI114700. The engine is stock 5.3 with LS1 cam and one turbo on top of it. MAP sensor is of course 2 bar version.
I wrote the original tune back in and started all over but the result stay the same. I don't know what to do next. In the enclosed log file I commanded OL few times when it was about to stall with -15% fuel trims. In OL it run fine and narrow bands showed rich mixture.