ok guys.. i got an 03 6.0. about 2 weeks ago it was driving fine and then just kinda started sputtering and then died. the truck just kept cranking over but would not fire. i have a solus and i was getting no reading from the icp sensor. so i replaced that, now im atleast getting a reading from that. and i kno it has to be over atleast 500psi for the truck to fire. im getting a reading of 58psi tops. so im thinkin maybe hpop?? the truck has 172,xxx miles and it was never replaced. this is the 2nd icp sensor i had to put in this and i replaced all the injectors about a year ago or less. also i tested the ficm and its working fine. im getting all the right voltages, and its a 7pin also if you were wondfering, not a 4 pin. but the thing that really is kinda baffling me is i cant even get the truck to fire on either. i took a rag and soaked it in gasoline and held it over the inlet tube that goes to the turbo so i can suck thru and get some gasoline vapors instead of just spraying straight either into it. even tho i did that too and it didnt work. the truck is stock besides an exahsut. i replaced all the fuel filters and bled the system. now last week when i was trying it with either and gas, its kinda sputtered and the injectors did start to pop off a lil and kinda started, but just died, now its not doing anything. whyy?? and help would be greatly appreciated and any ideas i will be willing to try. thanks

 

If you replaced the ICp sensor and still no pressure then it might be the IPR- injection pressure regulator, it is basically a electric valve, that is the part that is on the drivers side of the HPOP cover, I'm guessing the ICp was on the back of the same cover, right? anyway if the ipr sticks open it is just dumping all your oil pressure from the HPOP, could explain the low reading. hope this helps

 

ok but when i had my solus plugged in, i was watching the ipr and at koeo it said 15% and when i was cranking it went to 85%. what exactly does that percentage mean and what is it showing? now correct me if im wrong, the ipr is located about 2 inches away from the icp and opposed the the horizontal laying icp, the ipr is vertical right at the back of the drivers head? and if it is bad, is there anyway for me to test it? like test across the terminals for ohms maybe or continuity or if i unplug that, will it tell the ecm to revert to a constant value as if the vavle would stay closed so that it will hold pressure so i can try and see if the truck starts and verify that that is the problem and not the hpop? thanks

 

03 has the cast iron cover over the HPOP, I thought the IPR comes right off the drivers side of the cover, I might be confusing this with the 05, Don't think unplugging it will help because it is a valve, if it is stuck open it is a mechanical problem not an elec. problem. it is an electrical solenoid that opens a small plunger to blead off pressure when it is too high. I'm not a diesel tech, just have three of them in the family and couple of friends with them and I pretty much do all the work on them. wish I could answer what the % mean

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picture of IPR on this site, go back to 6.0 section, click on "sticky" bible for 03 04 powerstroke, then look at high pressure oil system, you will see the layout.

 

I just experienced that same thing exiting the freeway and barely made it off the off ramp.
Starting losing power sputtered and died.
New high pressure oil pump and oil pressure solenoid.

The computer was popping something like 12 or more codes and the they narrowed it to the solenoid and pump.

The crappy part was the dealer fixed the 2 parts but didn’t suggest or tell me the oil cooler should be replaced as well (early oil coolers were faulty)
It doesn’t make sense that they didn’t replace the $300 part while they were in there. Now I have to have the same components removed again to replace the oil cooler .

I think I will just have the EGR deleted at the same time so I wont have to worry about it either.