Normal IPR %?
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Cross-Country
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Normal IPR %?
I have about 2000 miles on my brand new motor that I have replaced that has been rebuilt fully from a bus donor. It’s on stock heads EGR delete and deleted emissions. It’s been running fine starting fine and everything has been going perfectly as it should until I went to the store today for about 20 minutes I came back outside. It wouldn’t start up. It would just keep on cranking and cranking and cranking and won’t go over 300 icp. I finally got it started after waiting an about 15 minutes and then got back to the shop to turn it off and then replicate that same problem. Turns out it starts right up and I’ve been here for about an hour trying to replicate what has happened. I’m attaching a snapshot of what my values look once I’m cranking. I sit around 180 F OIL TEMP AND 600 ICP PRESSURE WITH A 23% IPR. AT 700 RMP
Please check the values and let me know if anything seems off right now it’s continuing to work fine like it should. Maybe it just fixed itself and had a little hiccup at the store.
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Cross-Country
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85% was when truck was being cranked which took less than 2 seconds to turn on. Does this still indicate that?
Cargo Master
Joined: Oct 2018
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From: unfortunately Germany
It could also be due to a faulty IPR valve, but I think it is a leak in the HPO system due to the hot-no-start situation.
What ICP and IPR values are displayed when the truck does not start when warm?
What ICP and IPR values are displayed when the truck does not start when warm?
Cargo Master
Joined: Oct 2018
Posts: 2,808
Likes: 1,895
From: unfortunately Germany
Please make this test. Observe the ICP and IPR value when the engine is warm. In the case of leaks, the IPR valve closes completely at idle speed to keep the engine running. When engaging the drive gear / put in drive, the engine usually stops and will not start again until it has cooled down and the oil is a little thicker again.
Four injectors were the problem with this engine.
Four injectors were the problem with this engine.
Cargo Master
Joined: Oct 2018
Posts: 2,808
Likes: 1,895
From: unfortunately Germany
on this engine, this was the issue:
of course, the leak can be at any other location in the HPO system, so if I were you, I would check the ICP and IPR values as already mentioned, and if the suspicion of an HPO leak is confirmed, I would pressurize the system at the IPR valve port.
of course, the leak can be at any other location in the HPO system, so if I were you, I would check the ICP and IPR values as already mentioned, and if the suspicion of an HPO leak is confirmed, I would pressurize the system at the IPR valve port.
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Cross-Country
Joined: Oct 2024
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Please make this test. Observe the ICP and IPR value when the engine is warm. In the case of leaks, the IPR valve closes completely at idle speed to keep the engine running. When engaging the drive gear / put in drive, the engine usually stops and will not start again until it has cooled down and the oil is a little thicker again.
Four injectors were the problem with this engine.
https://youtu.be/9xQyoWJa3R8?si=yYRMaqCphLKoESgX
Four injectors were the problem with this engine.
https://youtu.be/9xQyoWJa3R8?si=yYRMaqCphLKoESgX
All injectors were replaced with oem new ones btw.
I have the values you asked for below. took it on the highway for about 10 minutes to go eat and turned on right away at the restaurant. These tests below are back at my house after the drive back.
This is idling after the drive back
This is truck on (engine not started)
This is a snapshot when I was cranking engine over (turned on after 1.5 seconds of cranking)
This is right when i switched it into drive
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Cross-Country
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No dtcs Checked with IDS. Only are for trailer brake and instrument cluster. Very weird
Cargo Master
Joined: Oct 2018
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From: unfortunately Germany
That is strange. A no-start situation should set DTCs if too low oil pressure was the cause. Then you have no choice but to observe the values carefully and check all relevant values with IDS immediately in the event of an unusual situation.
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