Just bought 1997 f350 cclb dually 7.3l zf5 4x4 242k miles.
Started at the guys house but cold natured so I'm pretty sure it needs glow plugs, changed gpr already with a known good one.
I was driving it home ran perfect cruising at 70 and all of a sudden it died. Coasted to stop and ended up having it towed home.
At first there was no wts light so I checked all fuses in cab and under hood they are good, fuel heater was already unplugged when I got it. Also changed cps with a new known good one tach moves while cranking.
Pulled pcm and turns out it had a really poorly installed superchips chip on it, pulled that off and reset batteries, wts light came on and verified glow plug system working. Still wont start, suspected pcm bad so I plugged up the edge cts from my 02 and it seems that the pcm is working properly, all readouts are good and it is showing code p0470 exhaust back pressure sensor malfunction. while cranking I am getting 4-500 psi, while cranking with icp un plugged I get 2500 psi and it throws a code.
Fuel pump and filter are new, Schrader valve is spitting fuel while cranking but hardly any smoke comes out.
What am I missing?, IDM, icp, ipr? I didn't figure they would go out all of a sudden, I have tried starting fluid (I know bad for it, tiny sprays) and wd40 to no avail, block heater is plugged in and oil temp is 85*. I cant figure this out. Batteries are good, have them hooked up to a jumper box, its cranking over at normal speeds but drops to 9ish while cranking.
Its got me stumped hate to think I wasted money on this truck, I've always wanted a 4x4 obs with a 7.3 and zf5.
truck in question: