2005 F250

To date this has been done, some at different times.
ARP studs, OEM head gaskets, heads machined, oil cooler replaced, new fuel injectors, reman'd HPOP w/IPR with STC fitting, EGR delete, 4" turbo back and SCT x3 tow tune.

We originally had a leaking injector that gave us issues (Thread is here) but we pulled the cab and went through the motor, installed studs etcetera.
After the rebuild we ran it approximately 1K miles and it ran great, then one day towing a '65 C10 on a 20' flatbed it shut off while cruising down the road, crank no start on the side of the road, scanguage showed ICP was too low to fire the injectors so we towed it back to the shop and replaced the HPOP, still low ICP.

What's the next step of diagnosis? I'll have ICP numbers by monday, it's been several months since all this happened and I'm currently out of state trying to help my dad diagnose.
If i remember correctly the ICP numbers were low teens or 20's.

I don't know for sure but I don't think we replace the standpipe or dummy plugs when we had it apart, could that be the issue?

My thoughts are either we have a leak in the high pressure side or low pressure isn't supplying enough oil to build pressure, so in theory we would want to check low pressure first, correct?

 

Not much chance of a low side oil pump failure. You IPR % is how closed the regulator is. Hence if it's up near 85%, you have a high side leak, good bet on a dummy plug or standpipe o ring failure, knowing it ran for 1000k first. Maybe an injector o ring leak too.
You need to get an ICP oil pressure reading as it should be over 550 minimum. When you said ICP was too low, the oil pressure wasn't high enough. If the IPR is low, the regulator isn't closing due to adequate high side pressure.
We need a review of your numbers posted again to head the right direction.
Probably a leak down test is next.

 

Here's My experience with something similar:

I changed 3 injectors just over a year ago and mine did the same thing. Pulled up into my MIL (rip) yard and it just shut off, crank no start, low HPO.

I had put new standpipes and dummy plugs in it so I didn't suspect them. However, when I did the air test, I could see mist coming from the oil rail area on the even cyl side and could hear the hissing.

I pulled the standpipe and one of the new o rings had blown. Could be I wasn't careful enough installing it. Lucky for me, most of it was intact and inside the standpipe. I did find a few tiny pieces in the oil rail so I cleaned it out good and put in the one that I had taken out originally. It was one of the newer style since it had the Teflon washer on it.

That fixed my issue and I was BOTRA.

 

Sounds typical to an IPR blow out

1k low miles after oil cooler
​​​​​​​ the lower the Mile the higher probability usually within first 500 mile

Did you check it when you there a pump at it

​​​​​​​

 

Most likely your issue

 

Should of been the first thing to check after all of that work, but, should of been noticed while doing the hpop

 

IPR is 85%(or 84.7, whatever the max value is)

Ok, I'll start getting the parts for the air test, I'll be back home in 2 weeks so I'll have everything ready to dive in.

Ok, sounds like the air test should find our problem pretty quickly,

IPR was changed with the HPOP after it died on the side of the road, i forgot to say that.

 

So this truck has had two late build HPOP's within 1000 miles?

Is so that is really rare, it's rare enough the V style goes bad period.

 

Sorry, i need to clarify the OP when I get a chance.

HPOP wasn't replaced when we did the studs but was replaced after it died on the side of the road, approximately 50K earlier the HPOP was also replaced because of hard starts when warm.

 

ICP after 20 seconds of cranking-17PSI
FICM while cranking-38.5 volts (EDIT) 48.5 Volts
Crank and Cam sync
IPR 84.7 while cranking

Gonna get it in the shop sometime today and do the air test and see what we find.

 

As has been indicated, you have a high pressure oil system issue. Sadly, given your FICM voltage, you also have a FICM issue.

We can either repair your FICM or offer you one on exchange. We can also help you out with any parts you need for your high pressure oil system.

Www.ficmrepair.com ftw!

 

I wasn't thinking when I replied earlier, I just ran back out and checked, the FICM is 48.5 Volts. (Half shell was replaced ~3 years ago)

I did notice the low pressure on the dash comes up to center and stays with the key on and while cranking, it doesn't seem right that it indicates pressure with just the key on and no cranking.

 

Pulled the oil filter cap and low pressure side checks out, getting the valve to do the shop air test tomorrow for the high pressure side.

 

Looks like a bad IPR, pulled the turbo and hooked up shop air, 12V to the IPR and no click or change in air noise.

 

OEM brand
How old