Hello, I have a 1994.5 f250 with 113k on the clock. I am down in Austin on vacation and was planning to head home tomorrow evening however my truck keeps shutting off. It seemed to become more frequent this afternoon. It will die under power with a check engine light, only to be able to start back up minutes later once the check engine turns off. I picked up a code scanner and was unable to pull any codes. I replaced the CPS already as that sounded like a very likely culprit.

I am suspecting it is another electrical sensor based on how it dies with the check engine and starts right back up once the code clears. Please give me any suggestions or if there are anyone knows any guru's down here I should take it to.

 

I'll try and look up some more stuff but off the top of my head, I'd try and take a look at your IPR sensor plug/tin nut.


I've had that tin nut on the IPR come loose and almost fall off before. I think if that's loose, the IPR is free to move around and then causes all sorts issues for controlling the HPOP or injectors or some jazz like that.


And just in case you haven't messed with that sensor before, it's on the back of the HPOP towards the driver's side. There will probably be some fuel lines and stuff above it making it pretty difficult to squeeze your hands/tools down there but it's doable!


Edit: Another sensor to check if your IPR checks okay is your ICP sensor which is on the drivers side kinda near the front I believe on the cylinder head at the top. If you unplug that and it's filled with oil, then there is a good chance that sensor is bad and it will be replaced. If the sensor is bad, I believe it will cause a no start condition, but you should be able to leave it unplugged to start the truck and get it somewhere to change the sensor.

 

What brand CPS did you put in it?

 

Check your uvch's plugs for burnt pins.

 

Thanks for the tips so far, they are all helpful. I replaced the CPS with a Motorcraft from the dealer during the issue at its peak and it made no change. The tin nut on the IPR is tight, can the IPR still go bad though? I will try driving it around with the ICP unplugged tomorrow to see if that helps.

Great tip on the UVCH, I will check that in the daylight as well, I did confirm they were all tightly plugged in but did not inspect for burnt pins today.

Any other sensors I should check?

 

I'd make sure that the electrical connection at the pcm is also tight along with the grounding wire

 

Also pull the pigtail on the back of the IPR and check the wiring to make sure it isn't touching inside the back of the pigtail itself. If those wires are touching each other through the insulation, it'll cause this exact problem.

 

If you are getting a check engine light, you have a code stored. Most parts store code readers will not communicate with the Powerstroke computer. Until you get the code read, you are chasing your tail. You might stumble on to the problem, but it could get expensive before you do. Do you know anyone in the area that has a code reader that speaks Powerstroke? It sucks to take it to a shop that can read codes, but it could be the best 100 bucks you spend. With all that said, The IPR could be your problem. My 96 C&C truck started to die randomly, but it would restart after a few minutes, it had a code for pressure above or below required amount. The tin nut was MIA, on the IPR, so a known good used IPR was installed, and all was good.

 

Appreciate all the suggestions. I replaced the ICP and have driven 400 miles so far and no stalls. Ford dealer I picked it up from had some helpful parts guys, Their other suggestion was the IPR may be getting hot but to start with ICP.