2012 Isx 2350 475 with codes 4726 and 0559

[ahrenbenjudah]

Ok. I’m about to just set the truck on fire. I stayed until 1030 Friday night. Got new injectors installed, everything else wrapped up. Everything torques to spec etc.

Then the ecm wouldn’t accept the fuel trim codes. Not any of them. I called it a night. Came back in this morning, pulled everything back apart to assure that I had the correct numbers down. Resituated the injectors and the connectors to make sure they were installed as required. Everything torqued back to spec, and the ecm took the codes this time. (While reinstalling the injector harness, I had a stud break on a solenoid. That’s awesome). Anyways. Replaced that. Everything back together. Ecm has codes now. I turned the key on to check fuel pressure in the rail:

Nothing. Same thing as before. Pressure jumps around from -40psi to about 10 psi. Regardless if the lift pump is running or not. I haven’t done any further tests. I’m pi$$ed off and frustrated.