2001 7.3 High Pop Empty
Cargo Master
Joined: Apr 2022
Posts: 3,203
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Has to be cranking before they tell you anything worth while. The hpop doesn't put out and pressure unless it's spinning.
Cargo Master
Joined: Apr 2022
Posts: 3,203
Likes: 1,704
Isn't making any high pressure oil. The way you said it just died while driving would make me suspect the ipr valve. I've had a couple fail over 10 years and die going down the road but would eventually restart after it cooled off.
Next thing I would do is check the ipr valve wiring at the pigtail make sure it looks good and make the the tin nut and magnet part and spacer are still on the ipr valve and haven't fell off. It's common for them to fall off.
Next thing I would do is check the ipr valve wiring at the pigtail make sure it looks good and make the the tin nut and magnet part and spacer are still on the ipr valve and haven't fell off. It's common for them to fall off.
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Fleet Mechanic
Joined: Dec 2006
Posts: 1,388
Likes: 6
Isn't making any high pressure oil. The way you said it just died while driving would make me suspect the ipr valve. I've had a couple fail over 10 years and die going down the road but would eventually restart after it cooled off.
Next thing I would do is check the ipr valve wiring at the pigtail make sure it looks good and make the the tin nut and magnet part and spacer are still on the ipr valve and haven't fell off. It's common for them to fall off.
Next thing I would do is check the ipr valve wiring at the pigtail make sure it looks good and make the the tin nut and magnet part and spacer are still on the ipr valve and haven't fell off. It's common for them to fall off.
Last edited by robjs111; Apr 30, 2025 at 01:42 PM. Reason: misspell
Cargo Master
Joined: Apr 2022
Posts: 3,203
Likes: 1,704
Should be 500+ psi before it will fire the injector. Not sure what that corralates to in voltage from the sensor. But a properly operating system will make 1500+ psi pretty easily while cranking.
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Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
I don't remember has unplugging the ICP been tried yet? Another thing to check is if the hpop got air locked during one of the empty reservoir cranking sessions. If you pull the ICP or a high pressure hose, whatever is most convenient, and check for a steady dribble of oil and no air bubbles the the pump is primed. If you do see air just leave it vented until it becomes a steady stream of oil. Shouldn't take a minute at most. Oh make sure the reservoir is full if you do.
Lead Driver
Joined: Jun 2004
Posts: 6,366
Likes: 595
From: Amarillo, TEXAS!
No, unplugging the ICP sensor won't help if there's not sufficient pressure. I disagree on the bad IPR theory because usually a bad IPR valve will still give you a couple hundred PSI cranking. So that would be somewhere around 0.5 volts or so. Is the reservoir still not filling up? Has the HPOP been off the engine lately?
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Fleet Mechanic
Joined: Dec 2006
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No, unplugging the ICP sensor won't help if there's not sufficient pressure. I disagree on the bad IPR theory because usually a bad IPR valve will still give you a couple hundred PSI cranking. So that would be somewhere around 0.5 volts or so. Is the reservoir still not filling up? Has the HPOP been off the engine lately?
Cargo Master
Joined: Apr 2022
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It's not really a voltage issue. The sensor works by reporting a voltage change to the pcm and that's how the pcm knows what the pressure is. No actual pressure and the voltage from sensor doesn't go up.
Cargo Master
Joined: Apr 2022
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That's means pcm is commanding fully closed on the ipr valve trying to get it to build icp pressure and it isn't. Under normal circumstances it will not be that high cranking.