The truck is a 1995 PSD and the problem we are experiencing is the thing shuts of going down the road. Just as if someone shut the key off. If we run it at WOT, it's fine, but when you let off, it shuts off. It's fine when the truck is cool, but seems to be the worst when it's hot. No codes. If someone could help me trace this thing down, I would greatly appreciate it.

 

This sounds like the cam position sensor.

 

i had something similar when i bought mine. it was ipr valve orings. $30 from international, $15 napa.

 

It sounds HPO related... Injectors or IPR.

How many miles?

Mods?

 

check your oil pressure if it gets below 7-8 psi it will shut down the truck.( not enough psi to feed the HPOP.)

 

motor has 120,000 on it. i changed out the cam sensor and the IPR...still having a problem. its only once the truck has warmed up after about 15 minutes or so that it will shut off. then if you let it sit for a few minutes, it will fire back up and you're good to go until it gets warm again. Read somewhere that it could also be a bad IPC.