HPOP help please
Post Fiend
Joined: Feb 2007
Posts: 14,541
Likes: 2
From: Dallas-Ft. Worth
Either the ICP or the IPR can cause that. It's difficult nut to verify which, but if you pull the connector of one of them and find oil, start there.
If you had a way to watch you ICP (Scan Gauge or AE), you could diagnose that yourself, BTW. Those tools are excellent investments.
I guess you could also pull a plug on the oil rail and crank it real quick. A 500psi shot of oil would indicate the IPR is working and the ICP/PCM just isn't seeing the pressure causing the no-start. The PCM MUST see 500psi before it turns on the injectors...
If you had a way to watch you ICP (Scan Gauge or AE), you could diagnose that yourself, BTW. Those tools are excellent investments.
I guess you could also pull a plug on the oil rail and crank it real quick. A 500psi shot of oil would indicate the IPR is working and the ICP/PCM just isn't seeing the pressure causing the no-start. The PCM MUST see 500psi before it turns on the injectors...
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Laughing Gas
Joined: Apr 2007
Posts: 1,238
Likes: 2
From: North Port, Florida
Either the ICP or the IPR can cause that. It's difficult nut to verify which, but if you pull the connector of one of them and find oil, start there.
If you had a way to watch you ICP (Scan Gauge or AE), you could diagnose that yourself, BTW. Those tools are excellent investments.
I guess you could also pull a plug on the oil rail and crank it real quick. A 500psi shot of oil would indicate the IPR is working and the ICP/PCM just isn't seeing the pressure causing the no-start. The PCM MUST see 500psi before it turns on the injectors...
If you had a way to watch you ICP (Scan Gauge or AE), you could diagnose that yourself, BTW. Those tools are excellent investments.
I guess you could also pull a plug on the oil rail and crank it real quick. A 500psi shot of oil would indicate the IPR is working and the ICP/PCM just isn't seeing the pressure causing the no-start. The PCM MUST see 500psi before it turns on the injectors...
Elder User
Joined: Jun 2009
Posts: 999
Likes: 0
From: Easley, SC 29640
i believe if your guage shot up, showing pressure, your HPOP is ok, IMO i would start looking at the IPR first...right Chris
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Laughing Gas
Joined: Apr 2007
Posts: 1,238
Likes: 2
From: North Port, Florida
thanks for clearing that up. Guess I need to get it back from the dealership and look for oil at the connectors for the ICP and IPR first thing then get some stuff ordered. I have found a HPOP and IPR for $500 with a 12 month warranty. That is the best deal I could come up with. Does anyone know of anything better than that.
Posting Guru
Joined: Dec 2009
Posts: 2,265
Likes: 2
From: Garden City, KS
I'd definitely say check out the IPR and ICP first. If you have no oil mess or leaks or oil in the valley pan, then don't fool with O-rings. I doubt the HPOP is bad... Clay told me he has never really heard of or seen a 7.3L HPOP just quit. Joey from Terminator Engineering (he specializes in the 7.3L's HPOP... both stock and modified) and he said the same thing. From what I can gather, the pump can weaken, but rarely quit. AE is a good tool/investment. I just bought it an am loving it... I just need to upgrade my PCM so I can use more parameters and perform more tests.
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Laughing Gas
Joined: Apr 2007
Posts: 1,238
Likes: 2
From: North Port, Florida
I'd definitely say check out the IPR and ICP first. If you have no oil mess or leaks or oil in the valley pan, then don't fool with O-rings. I doubt the HPOP is bad... Clay told me he has never really heard of or seen a 7.3L HPOP just quit. Joey from Terminator Engineering (he specializes in the 7.3L's HPOP... both stock and modified) and he said the same thing. From what I can gather, the pump can weaken, but rarely quit. AE is a good tool/investment. I just bought it an am loving it... I just need to upgrade my PCM so I can use more parameters and perform more tests.
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Laughing Gas
Joined: Apr 2007
Posts: 1,238
Likes: 2
From: North Port, Florida
Someone was talking about fuses earlier. What fuses could cause these symptoms? I will have it back tomorrow and would like to know what I can do if anything without an AE. to figure this out.
PREMIUM SPONSOR
Joined: Feb 2009
Posts: 6,037
Likes: 73
I think I would spend the money on an AE before I started throwing parts at it. Just my .02
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Laughing Gas
Joined: Apr 2007
Posts: 1,238
Likes: 2
From: North Port, Florida
thanks