Lets start from the beginning. It is a 1997 F250 4wd, OBS, 7.3 Powerstroke. The engine had 300k miles and I think it had a lot of wear. Compression was low in several cylinders and one had almost 0 compression. So I am guessing that was the no start condition for it. So I found an engine with 200k miles and decided to do a swap. Replacement engine is from a 1996.

Everything is pretty much stock. I check the glow plugs and put in new VC gaskets with harnesses. New fuel filter, new style fuel heater. Oil in the engine looked good, but it got an oil change. One tank full of fuel, the other about half full. Fired it up, several leaks, Tracked down and fixed. Fire it up and check levels. It purrs better than the other engine did, even when I got it. Idles great, starts quick. I took it a mile down the road and noticed it chugging as little. Not like a miss. more like fuel cutting out. Then it died at about 40 mph. Hmm.... Hit the key and it fired up spun it around and headed home. Have my foot on the throttle coming in the drive did not want it to die. Pull up to garage and it idled a little rough. Found another small leak. Fixed that, then a few hours later fired it up. It purred and idled very smooth. Great. After idleing 20 minutes or more. I got my confidence up and went to take it for a drive. I made it half way down the drive and it died. It almost seem like it would hit off once in a while. Today nothing, just cranks. Pulled it back to the garage and messed with it. This is my first diesel so I do not know a lot about them. I got a scanner tool but it does not give me a lot of info on diesels. As far as I can tell, no smoke out exhaust, but on firing the engine up when I got it, it did not smoke very much at all on starting. A LOT better than the old engine.

Ok what I can tell. Fuel bowl full. Fuel pressure at fuel bowl about 20 psi with tire gauge. Old gauge, it may be off a bit. WTS light on. Tach registers while cranking. CEL cycles and goes out. Scan tool does not pick up any codes or faults. Crank speed about 160 rpms. I got a charger on the batteries. HPOP during cranking is reading about 190-195 psi. Seems low. I am not sure where it should be. MAP sensor reading in range.

Ideas or other things to check?? Injector pressure regulator????

 

Ok from what I am reading... 190 psi HP oil is too low during cranking. It needs to be closer to 500? Am I correct? Forum reading gives several answers. Will it start with 190? Or way to low?

 

Here's my no start thread. Note that my thread title says newbie. It is slanted because I made a real good, lucky guess at the beginning and went that way with it.

https://www.ford-trucks.com/forums/1...n-low-icp.html

You need 500psi+ ICP. 20psi fuel pressure would worry me. Make sure your fuel filter and oil reservoir stay full.

There is a link to the no-start flowchart in the FAQ sticky.

Here is a link to a no-start list:

https://www.ford-trucks.com/forums/9...tart-list.html

 

Well if I need 500 psi cranking, I am not even close to that. As far as 20 PSI. A quick test by myself with a tire gauge. If I cranked it longer it may be higher. I was just glad to see fuel. Besides spraying all over while testing. It looks like another stab at a IPR. I can get one in town for $160 or off the bay for $60. Nice to get it on the road. But for a $100....

I will look at the links... I have been surfing threads.Thanks

 

Yea, I been through the thread earlier... BTW I did open the filter to see if any fuel was there... I was going to fill it and see if it ran. It was full already, Then seeing fuel pressure ruled out the pump.

 

My HPOP pressure quickly goes well past 500psi. When I was troubleshooting I didn't trust the scanner so I rigged up a mechanical gauge. I had one for the fuel pressure too. The local hydraulic company was a big help with fittings. Parker Hannifin maybe?

Did you put in a new IPR or use one of the old ones? I wanted to rig up a test light for the IPR circuit but didn't do it.

That no-start flowchart is a good guide.

 

I believe you can unplug the icp and see if it will start. It sounds like the ipr may not be getting the correct signal or the hpop is dead.

 

I used the one that was on that engine. It ran well before... But things happen... I did not find the no start flow chart on your link... (maybe overlooked it)... After some digging I found it in a sticky... I will head out there now and look over a few things... Toward the bottom of the chart.
Here is link for thread followers.... https://drive.google.com/file/d/0Byb...1qRU1VVGc/view

BTW I was going to use the old IPR from the old engine. But after looking it over, it is buried in grease. Would be a good idea to swapp, but that much work I might try a new one.

 

That was next on the list. Unplugged and still the same, low pressure. I think the ipr is shot. I went down the checklist and that is next on the list besides the hpop.

 

Well I stumbled on this under sensor info... Good help...
Requirements to Start
7.3L Powerstroke Starting Req.
Vehicle Power : *10.5v *
RPM Signal : 100rpm
Inj. Cntrl Press. (ICP) : *0.85v (about 500psi)
Fuel Pulse Width : *1 to 6 milliseconds

More info point my way.

 

I believe voltage can be applied to the IPR to see of the pump will respond. You don' want to start it that way but you can monitor the ICP when 12v is sent to the IPR. It should send max flow to the rails, I think, I have never done this but I think Nick (noslliw) did that to test a pump.

It is definitely a HPOP problem and you wouldn' be the first to have that fail.

 

Ok I am pretty sure it is in that area. Do you think it may be the IPR or the HPOP or the HPOP only?? I have an IPR on order so I will start with that anyway.

 

If the pressure doesn't come up with the IPR the pump would be next. Have you made sure the reservoir is full?

 

how full is the engine on oil?
does oil pressure go up fast?

 

I did not check that... I will put it on the list for when I get to it next.