Hey guys,
I have a 2004 f350, replaced the egr cooler for a leak.. After replacement and following 30km r-test it started misfiring and would not start. dtc p0603. I had the batteries disconected, tried to reprogram pcm with snap on programmer as per ssm 17571, unable to do so. Icp 1100 psi, ipr 31%, ficm sync yes, ficm pwr all good, swaped with a known good ficm, replaced injector harness, new oil, seems to have good vref, (i unplugged each vref sensor one at a time to eliminate vref concern.) I have good grounds and powers at pcm. im running out of ideas:(