7.3 help.
Cargo Master
Joined: Apr 2022
Posts: 3,201
Likes: 1,704
I'm going to just replace it. If I jack with it the oil pressure shoots up for a split sec and almost starts. That's new. The plug doesn't feel like it's connecting to anything it just falls in the port. Feels like when you put a fuse in a dead slot. But the gauge test shows everything is connecting right?
It seem like everything is reading like it should. Kind of hard to guess over just a picture. But when cranking ipr% should climb up in % as your cranking and icp should build pressure as your cranking. Takes around 500 psi before injector fires.
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5th Wheeling
Joined: Aug 2022
Posts: 33
Likes: 2
It should have a little metal clip that snaps in place and holds it in.
It seem like everything is reading like it should. Kind of hard to guess over just a picture. But when cranking ipr% should climb up in % as your cranking and icp should build pressure as your cranking. Takes around 500 psi before injector fires.
It seem like everything is reading like it should. Kind of hard to guess over just a picture. But when cranking ipr% should climb up in % as your cranking and icp should build pressure as your cranking. Takes around 500 psi before injector fires.
Lead Driver
Joined: Jul 2017
Posts: 6,862
Likes: 2,335
From: WV
Originally Posted by Muteme87
Ya its msking good condition. Well I'm ordering a oem ipr. It will be a couple days I'll let yall know how it goes. I want to think everyone that has helped me. A couple weeks ago I never even heard of an ipr icp hpop. I'm getting a crash course on this 7.3
Be sure to check the IPR wiring as well. Pull the loom and check back a good ways.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
A very common problem with our trucks is a short in the wiring to the IPR valve. I've had it happen to me also back when I first got my 7.3 and knew nothing about how everything worked let alone how it all worked together. It kicked my *** for months and cost me a good bit of $$. Anyway back to the point, the insulation will actually turn to putty or something inside the harness. I'd guess it gets saturated w/ oil from all the years of service and just deteriorates. It usually starts as an idle dip, then occasionally will randomly stall , sometimes it won't restart for hours then fires off like nothing happened. If this is your problem it sounds like it's in the latter stages and wiggling the connector makes contact for short blips. I would open the harness and inspect the wires for a good 8-10 inches if you can. If you do have a short it would likely be pretty easy to spot once you get all the loom and tape out of the way.
Dammit Jason beat me to the wiring harness, that'll teach me for laying out a saga instead of short and sweet.
Dammit Jason beat me to the wiring harness, that'll teach me for laying out a saga instead of short and sweet.
Lead Driver
Joined: Jul 2017
Posts: 6,862
Likes: 2,335
From: WV
Originally Posted by udsuth78
Dammit Jason beat me to the wiring harness, that'll teach me for laying out a saga instead of short and sweet.
It was just that I only had time for the short cliff notes version. Your’s is much more thorough. (BTW posts popping up while I’m writing a reply happens to me all the time too)
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5th Wheeling
Joined: Aug 2022
Posts: 33
Likes: 2
I just put 12 volts on the ipr and she fired up. Do you think that sounds like a wiring issue or bad ipr?
Lead Driver
Joined: Jul 2017
Posts: 6,862
Likes: 2,335
From: WV
Originally Posted by Muteme87
I just put 12 volts on the ipr and she fired up. Do you think that sounds like a wiring issue or bad ipr?
Either way the wiring should be confirmed as next step before buying parts.
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Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Wiring, IPR works when it gets voltage. You can check the voltage in the connector. The red wire should show battery voltage at all times while the ignition is on. The PCM controls the valve w/ the ground side of the circuit. The quickest though is to just open the harness and have a look.
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5th Wheeling
Joined: Aug 2022
Posts: 33
Likes: 2
I would guess the wiring but that’s just a guess. My thinking is the PCM should already be commanding the needed voltage, so running with direct power points to wiring. But I’m not sure the IPR is a 12v solenoid. It may only see 5v max from the PCM (don’t remember) in which case you’ve now added more than normal and potentially “pushed” a bad IPR into functioning.
Either way the wiring should be confirmed as next step before buying parts.
Either way the wiring should be confirmed as next step before buying parts.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Bad PCM doesn't seem likely. The IPR DC% numbers climb when cranking the engine don't they? That means the PCM is asking for more hpo, but that pid doesn't tell us if the signal is received only that it was sent. All the signs are pointing to either a wiring short or bad connector.
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5th Wheeling
Joined: Aug 2022
Posts: 33
Likes: 2
Bad PCM doesn't seem likely. The IPR DC% numbers climb when cranking the engine don't they? That means the PCM is asking for more hpo, but that pid doesn't tell us if the signal is received only that it was sent. All the signs are pointing to either a wiring short or bad connector.
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5th Wheeling
Joined: Aug 2022
Posts: 33
Likes: 2
Thank you all
Yall are freaking awesome. I bought this truck as the ppl was pulling parts off getting ready to part it out. Idk much about diesels but I have heard everyone all my life saying the 7.3 was a great engine so I had a feeling it still had life in her.
The funny thing is the ipr was the first thing I looked at But it looked new and the ppl said they threw all kinds of parts at it. So my head said of course it's not going to be that ez and moved on and replaced everything else. Without yall pointing me back to the ipr she would have been scrap. Yall saved a 7.3 and gave a poor boy his first diesel. Thank you to everyone. I know some of you put some real time into helping me and I really appreciate it.
The funny thing is the ipr was the first thing I looked at But it looked new and the ppl said they threw all kinds of parts at it. So my head said of course it's not going to be that ez and moved on and replaced everything else. Without yall pointing me back to the ipr she would have been scrap. Yall saved a 7.3 and gave a poor boy his first diesel. Thank you to everyone. I know some of you put some real time into helping me and I really appreciate it.
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,355
Likes: 5,947
From: Lake Hartwell, GA
Congrats on getting the truck running again!
Just a word of caution going forward, the 7.3L is notoriously picky about only using Motorcraft or International sensors and vavles like CPS, ICP, IPR, etc. If you need to get an aftermarket sensor to get back on the road, go for it. Just know that the 7.3L may be upset about it at some point in the future.
Just a word of caution going forward, the 7.3L is notoriously picky about only using Motorcraft or International sensors and vavles like CPS, ICP, IPR, etc. If you need to get an aftermarket sensor to get back on the road, go for it. Just know that the 7.3L may be upset about it at some point in the future.