Hello,
I have a rather unique project involving an engine swap using a 2019 Mustang GT PCM and a 7.3 Godzilla. Engine has been wired up to look like a coyote to the PCM (minus the obvious missing cams). We just started trying to get a base tune together and while we can get it to start and idle pretty well, the fuel system is stuck in Open Loop. Immediately upon startup the fuel system status switches to "OL - Fault" with no adjustment of fuel trims. Verified that the O2 sensors are operating properly and they both report as ready for closed loop seconds after startup. My thought is that this has something to do with how DI was deleted. Attached is the (very rough) base tune in which the DI hardware is disabled and all blend tables zeroed out. Fuel rail system faults (pressure sensor and volume solenoid control) are disabled in the DTC list. Anyone have an idea of what we are missing?