Here we go. 1999 7.3l 6spd standard 4x4. Just bought the truck 4 months ago knowing it had a problem that once warm occasionally would t start. Happened a few times every week or two. But wait 15 minutes and the truck would fire back up. Then it started happening more often throughout a day. And I would have to wait longer for it to cool to start it up.
So!
Icp has been changed
Cam sensor
Pulled valve covers to check to see if there were any injector o rings failing. They were all good. Put it all back together.
Pulled the IPR and tore it apart cleaned it all out

Started driving it ran great for a week. Then today sitting at a light the truck died just as if I had turned the key off. Wouldn't start for 3 hours. The. Fired up. Took it to buddies show and started checking things out again. Both batteries load test great and fully charged. Alternator pumping out 13.5 and up
Codes i have pulled are waste gate to high /low
I forget the number for that one. The second was
P1211. Cps has been changed and ipr cleaned. Think that I should replace the ipr of this happens again?
I did get w code a few weeks ago about low voltage at module. this code doesn't appear anymore. Since I checked the plug ins all looks good. But the PCM wasn't mounted properly. So I fixed that up and checked battery connections. They were very good so I re did all of that.

Anyway. Back to the problem. After ipr clean. Drove as she should until sitting at a light a week later. Truck just quit. Would t start back up until cold. Any thoughts. New IPR? Oil in hpop within half inch from top. And I don't seem to have any oil leaks. Did oil change fuel and air filter. Not low on any fluids. Thoughts?

I had a 1997 too and threw a bunch of cash at it like this one trying to find the issues. Please someone help and convince me these diesels aren't just a pile of sh**

 

OK. These are great trucks powered by one of the best diesels ever built.

Convinced?

On a serious note. Don't drive it so far that you"ll be stranded during this test if this doesn't work. Get yourself either a big cup of ice water and or a can of compressed air. When it shuts down and cranks and then won't run, dump the cold water on the IPR or invert the canned air and spray the IPR with the frozen mist.

Next, immediately jump in the truck and see if it cranks and runs. If it does, replace the IPR.

 

Thanks very much I will give it a shot! And yes I must say I do love the truck! aside from chasing down these issues.

 

Oh. And when it shuts down the truck does crank. But won't start

 

Got it...I added clarification.