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7.3 randomly stopped on road with no hesitation or weird sound! It will not start but cranks over great ! Fuel pressure is at 63 psi , High pressure oil pump is reading 2700 with injectors showing about 375 during cranking, i removed injectors and found several external o-rings completely ripped , put new ones in and reinstalled with just replacing the external o-rings , My oil pressure has not went up after replacing o-rings I said my ECU in to get it repaired. (Thinking that could possibly be it since I have been running the edge programmer on it ) they said it was unrepairable so they sent me a new one , they said plug and play ,, i can get it to start on ether but i won't stay running ,any help would be appreciated!
Ok, so you don't have enough ICP hydraulic pressure for the truck to run. That can be a bad IPR valve or a loose solenoid on it, a blown injector o-ring, a bad HPOP or insufficient oil supply to the HPOP. Have you checked the engine oil level?
Ok, so you don't have enough ICP hydraulic pressure for the truck to run. That can be a bad IPR valve or a loose solenoid on it, a blown injector o-ring, a bad HPOP or insufficient oil supply to the HPOP. Have you checked the engine oil level?
I just changed my oil with a new filter before I started any of this, I never had problems before until it just died dead on the road, usually if it's a high pressure oil pump wouldn't you have symptoms early on or do they just fail outright? I have not done a manual gauge for the hpop but my sensor reads 2700 when I unplug my ICP sensor , I have a manual gauge coming. I want to check it manually , I have a new IPR valve coming tomorrow that I'm going to try , earlier throughout this process i did try one off of eBay but it didn't help !
I did check the oil level in my high pressure oil reserve and it was low but as soon as I started cranking it filled up immediately ,
Last edited by Aaron7241992; Feb 23, 2026 at 08:04 PM.
You don't need a gauge. Your ICP pressure is low as indicated by the voltage reading. The PCM needs to see about 0.84 volts before it will allow the engine to start. I'd start by making sure the IPR solenoid is attached properly. What was the voltage with the ignition on, not cranking?
With the key on , both high pressure oil lines taken off of the rails, I capped one off and put a gauge on the other oil line , How do I get the IPR to allow me to see full pressure? My manual gauge just bounces from 400 to 900 really fast as I'm cranking
With the key on , both high pressure oil lines taken off of the rails, I capped one off and put a gauge on the other oil line , How do I get the IPR to allow me to see full pressure? My manual gauge just bounces from 400 to 900 really fast as I'm cranking
You can apply 12 volts to the IPR solenoid for a minute or so with out a problem. If you have an old valve cover gasket laying around, cut one of the injector connectors off and use it. They're the same as the IPR connector. Or, Standard part number S587 from a parts store is a repair connector. Polarity doesn't matter. If you have an oscilloscope, you can back probe it and check the waveform. I believe it's a 440hz square wave signal at 12 volts. Alternatively, see if it'll light a test light.
You can apply 12 volts to the IPR solenoid for a minute or so with out a problem. If you have an old valve cover gasket laying around, cut one of the injector connectors off and use it. They're the same as the IPR connector. Or, Standard part number S587 from a parts store is a repair connector. Polarity doesn't matter. If you have an oscilloscope, you can back probe it and check the waveform. I believe it's a 440hz square wave signal at 12 volts. Alternatively, see if it'll light a test light.
I did that and put 12 volts directly to the IPR while being dead-headed on my oil lines, my pump would still rapidly bounce between 500 and 1,000 PSI I don't have time to wait for a deadhead for the IPR but the ipr is brand new so I'm hoping that it was closing all the way with the full 12 volts , so I have my high pressure oil pump pulled out and I have another one coming on Saturday that I will install , hopefully that will solve my problem
7.3 randomly stopped on road with no hesitation or weird sound! It will not start but cranks over great ! Fuel pressure is at 63 psi , High pressure oil pump is reading 2700 with injectors showing about 375 during cranking, i removed injectors and found several external o-rings completely ripped , put new ones in and reinstalled with just replacing the external o-rings , My oil pressure has not went up after replacing o-rings I said my ECU in to get it repaired. (Thinking that could possibly be it since I have been running the edge programmer on it ) they said it was unrepairable so they sent me a new one , they said plug and play ,, i can get it to start on ether but i won't stay running ,any help would be appreciated!
It's too early and blood isn't flowing through my brain properly yet...
It's going to take a long time to purge the air out of the system since the injectors were pulled. I don't care what parts you throw at it, it will not read oil/ injector pressure or start until this air is purged enough. Maybe i'm missing something here
every bad HPOP I have seen will not get close to 375 psi, so I don't think it's the HPOP but you'll find out this weekend.
Truck just randomly shut off, cranks but will not start...isn't that a symptom of a bad CPS and possible wire chaffing at the drivers side valve cover junction.
also, curious where you just sourced your new parts from? hopefully the dealer or reputable online source
Random 'shut down', like you turned the key off going down the road..... CPS going bad or moisture got pasted the seal on the CPS and disrupted the electrical flow or connections or chaff wires. A chaff wire at the valve cover should allow the truck to run, just badly. I do think that the problem has been compounded by pulling the injectors. There is a lot of air to purge. No ether. Crank it until you have purged most of the air out of the fuel lines. Charge your batteries.
It's too early and blood isn't flowing through my brain properly yet...
It's going to take a long time to purge the air out of the system since the injectors were pulled. I don't care what parts you throw at it, it will not read oil/ injector pressure or start until this air is purged enough. Maybe i'm missing something here
every bad HPOP I have seen will not get close to 375 psi, so I don't think it's the HPOP but you'll find out this weekend.
Truck just randomly shut off, cranks but will not start...isn't that a symptom of a bad CPS and possible wire chaffing at the drivers side valve cover junction.
also, curious where you just sourced your new parts from? hopefully the dealer or reputable online source
I installed the new high pressure oil pump today. (It came early) It cranked over for 3 seconds and popped right off and she runs like a top
Random 'shut down', like you turned the key off going down the road..... CPS going bad or moisture got pasted the seal on the CPS and disrupted the electrical flow or connections or chaff wires. A chaff wire at the valve cover should allow the truck to run, just badly. I do think that the problem has been compounded by pulling the injectors. There is a lot of air to purge. No ether. Crank it until you have purged most of the air out of the fuel lines. Charge your batteries.
I hydro locked it when I pull the injectors, I had to pull out the glow plugs to remove the oil , even though I did pull the two small plugs from the oil rail to release The oil before I started , I installed my new high pressure oil pump today and 3 seconds of cranking. It's fired right up and runs pretty good and it takes some time to burn out all the oil in my exhaust
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