Im with them !!! How many miles are on your truck?
Truck spent three weeks at a small dealership with a nice young deisel tech, the only guy in the shop. He always had 5 to 7 trucks in there at one time. Admitted that he went after all the easy stuff first.
Hooked up a supposedly known good FICM
R&R Exhause pressure sensor
Removed turbo to check hpop, said it was good
Oil pressure gauges showed good High and Low pressure
Fuel pressure gauge showed good pressure
loosened / removed glow plugs to see it diesel was injecting, saw mist
removed oil pan to check that crankshaft timing wheel was in place, it was
noticed fine metal particles on upper oil pan and remembered that camshaft sensor showed wear.
Borescope inspection showed scoring on camshaft timing pin.
Camshaft timing pin is loose and no sync.
Need small block and wiring harness 12K out of my pocket.
I think he got frustrated.