2001 7.3 High Pop Empty
Cargo Master
Joined: Apr 2022
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And that is with the ipr block off plug thing installed? How long did you crank it for as well?
Unplugging the icp sensor just makes the pcm go to a default reading just trying to get it to run. It's not actually making 2500psi icp with it unplugged.
Unplugging the icp sensor just makes the pcm go to a default reading just trying to get it to run. It's not actually making 2500psi icp with it unplugged.
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Fleet Mechanic
Joined: Dec 2006
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Next will be hpop psi test, ordered parts after figuring out what I needed. Riffraff is sold out of several fittings, gauge needed for hpop test but hopefully this will work. Zero psi should directly point to weak hpop but when I cranked motor over with icp removed from motor oil did flow out after a bit of motor turning over.
Next will be hpop psi test, ordered parts after figuring out what I needed. Riffraff is sold out of several fittings, gauge needed for hpop test but hopefully this will work. Zero psi should directly point to weak hpop but when I cranked motor over with icp removed from motor oil did flow out after a bit of motor turning over.
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Fleet Mechanic
Joined: Dec 2006
Posts: 1,388
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Questions
Possible for a bad ipr that forscan is showing 65% closed but actually is open and sending oil to crankcase while cranking motor? Also can a good lpop keep up with a hpop with a bad ipr? Seems hpop reservoir remains full if I physically top off and let sit but after cranking motor reservoir empty’s. I would think a bad ipr should still pull some oil pressure and not zero.
Possible for a bad ipr that forscan is showing 65% closed but actually is open and sending oil to crankcase while cranking motor? Also can a good lpop keep up with a hpop with a bad ipr? Seems hpop reservoir remains full if I physically top off and let sit but after cranking motor reservoir empty’s. I would think a bad ipr should still pull some oil pressure and not zero.
Lead Driver
Joined: Jul 2017
Posts: 6,866
Likes: 2,338
From: WV
Forscan is not showing that the IPR is 65% closed. It is saying that the PCM is commanding the IPR to be 65% closed. There’s a big difference in this wording/logic. I can tell my kids to clean their room, but doesn’t mean they’re actually doing it.
I think we covered the empty reservoir a while back. I thought you said it remained full after cranking. If you crank the engine and the reservoir doesn’t stay “full” then the LPOP is not keeping up.
That could be:
My opinion anyhow.
I think we covered the empty reservoir a while back. I thought you said it remained full after cranking. If you crank the engine and the reservoir doesn’t stay “full” then the LPOP is not keeping up.
That could be:
- Low oil level
- Broken pickup tube
- Bad LPOP
My opinion anyhow.
Cargo Master
Joined: Apr 2022
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It's hard to follow along with what your testing and how. Yesterday you tested for icp psi on forscan cranking. I responded was that with the ipr block off plug installed and got no response. So it's kind of hard to help when we don't know exactly what and how your doing it. We're literally just guessing without correct info. So we're you testing with the ipr block off plug you got or with the ipr valve installed?
CNCFAB
Joined: Apr 2020
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Questions
Possible for a bad ipr that forscan is showing 65% closed but actually is open and sending oil to crankcase while cranking motor? Also can a good lpop keep up with a hpop with a bad ipr? Seems hpop reservoir remains full if I physically top off and let sit but after cranking motor reservoir empty’s. I would think a bad ipr should still pull some oil pressure and not zero.
Possible for a bad ipr that forscan is showing 65% closed but actually is open and sending oil to crankcase while cranking motor? Also can a good lpop keep up with a hpop with a bad ipr? Seems hpop reservoir remains full if I physically top off and let sit but after cranking motor reservoir empty’s. I would think a bad ipr should still pull some oil pressure and not zero.
You’re chasing ideas around in circles without getting the basic info that can pinpoint the issue in a matter of minutes.
You need to verify lpop pressure is building and holding in the reservoir while cranking. From what I see and the contradictory info I have read, no, you have no lpop pressure. You need to forget the hpop and absolutely forget the ipr until you know the hpop is actually getting oil fed to it consistently.
Cargo Master
Joined: Apr 2022
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Likes: 1,705
I am going to refer you way back to post 15.
You’re chasing ideas around in circles without getting the basic info that can pinpoint the issue in a matter of minutes.
You need to verify lpop pressure is building and holding in the reservoir while cranking. From what I see and the contradictory info I have read, no, you have no lpop pressure. You need to forget the hpop and absolutely forget the ipr until you know the hpop is actually getting oil fed to it consistently.
You’re chasing ideas around in circles without getting the basic info that can pinpoint the issue in a matter of minutes.
You need to verify lpop pressure is building and holding in the reservoir while cranking. From what I see and the contradictory info I have read, no, you have no lpop pressure. You need to forget the hpop and absolutely forget the ipr until you know the hpop is actually getting oil fed to it consistently.
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CNCFAB
Joined: Apr 2020
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But what he has said before and after that contradict that, I want to see an actual gauge on it and extended cranking
Lead Driver
Joined: Jul 2017
Posts: 6,866
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From: WV
Originally Posted by Tpayne621
He posted a video week or 2 back with oil pouring out of the hpop reservoir plug while cranking. It is or was getting oil at said time.
Originally Posted by ESwift
But what he has said before and after that contradict that, I want to see an actual gauge on it and extended cranking
I had forgotten about the video of LPOP flow. But now the reservoir stays empty? Doesn’t make sense.
Eric is correct, checking the LPOP pressure should give a quick indication of its health. Good place to start for next step.
Back to Rob’s earlier question though for which I don’t know the answer. If the IPR is stuck on full open, can the LPOP keep up at idle/cranking speed? I assume the answer is yes but would like to hear from someone with experience.
Cargo Master
Joined: Apr 2012
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From: Bottom Of Pikes Peak
Lead Driver
Joined: Jul 2017
Posts: 6,866
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From: WV
Originally Posted by INFRNL
Last I remember he said the reservoir is staying FULL now
Cargo Master
Joined: Apr 2012
Posts: 2,038
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From: Bottom Of Pikes Peak
Makes a lot of sense. Thinking I need to go through the entire harness and replace pigtails if needed. I will check ipr and icp connectivity tomorrow. As far a reservoir I think it’s a non issue moving forward, has been full and staying fill this week. I might have assumed res was empty without actually physically testing level thoroughly but oil level in pan was below hash mark
on dipstick.
on dipstick.
I'm with Pikachu and why I've been trying to mind my own business... Just adding my 2cents every once in a while.
This truck should have been back on the road by now as well.