Intermitant Limp Mode
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
At 2500 rpm it should be 40%, yours is 42.58%. At 650 rpm you should be 21-23, your at 24.6%.
Don't watch the pressure, watch the IPR numbers.
The pump makes 4000psi or nearly so all the time, the IPR dumps what it doesn't need. So your desired numbers and actual match... but the amount it's sending is higher than normal. That's indicating that you have a leak, a small one internally. Also the fact you have to wait on a restart until it cools down sometimes confirms that you have a leak. Once the oil cools, it builds pressure easier and it starts... not rocket science.
The seals require pressure to seat. Your truck shows symptoms of the classic hot no start. Your pressures are off, but you can't figure other why the truck runs like crap. Plus you've thrown a bunch of parts at it, not fixed yet.
Believe it or not..... Good luck
Don't watch the pressure, watch the IPR numbers.
The pump makes 4000psi or nearly so all the time, the IPR dumps what it doesn't need. So your desired numbers and actual match... but the amount it's sending is higher than normal. That's indicating that you have a leak, a small one internally. Also the fact you have to wait on a restart until it cools down sometimes confirms that you have a leak. Once the oil cools, it builds pressure easier and it starts... not rocket science.
The seals require pressure to seat. Your truck shows symptoms of the classic hot no start. Your pressures are off, but you can't figure other why the truck runs like crap. Plus you've thrown a bunch of parts at it, not fixed yet.
Believe it or not..... Good luck
Thread Starter
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Freshman User
Joined: Mar 2003
Posts: 45
Likes: 0
From: Anola, Mb
At 2500 rpm it should be 40%, yours is 42.58%. At 650 rpm you should be 21-23, your at 24.6%.
Don't watch the pressure, watch the IPR numbers.
The pump makes 4000psi or nearly so all the time, the IPR dumps what it doesn't need. So your desired numbers and actual match... but the amount it's sending is higher than normal. That's indicating that you have a leak, a small one internally. Also the fact you have to wait on a restart until it cools down sometimes confirms that you have a leak. Once the oil cools, it builds pressure easier and it starts... not rocket science.
The seals require pressure to seat. Your truck shows symptoms of the classic hot no start. Your pressures are off, but you can't figure other why the truck runs like crap. Plus you've thrown a bunch of parts at it, not fixed yet.
Believe it or not..... Good luck
Don't watch the pressure, watch the IPR numbers.
The pump makes 4000psi or nearly so all the time, the IPR dumps what it doesn't need. So your desired numbers and actual match... but the amount it's sending is higher than normal. That's indicating that you have a leak, a small one internally. Also the fact you have to wait on a restart until it cools down sometimes confirms that you have a leak. Once the oil cools, it builds pressure easier and it starts... not rocket science.
The seals require pressure to seat. Your truck shows symptoms of the classic hot no start. Your pressures are off, but you can't figure other why the truck runs like crap. Plus you've thrown a bunch of parts at it, not fixed yet.
Believe it or not..... Good luck
I put a new HPOP pump in in the summer when i had a hot nostart and i air pressure tested before i reassembled everything and it had no leaks.
It only has about 3000 kms on it since then.
At 1200 rpm and running fine IPR is 32.64 and 1200 rpm and running like crap it is 32.42. What is that telling us?
It is odd to me that it runs perfect 99% of the time and then suddenly runs so bad and fixes itself in a few minutes. A real pain in the butt in traffic on the highway and in the city.
Thread Starter
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Freshman User
Joined: Mar 2003
Posts: 45
Likes: 0
From: Anola, Mb
I did not measure the IAT1 and 2 but the EGR is blocked off with a plate. no exhaust is getting into the intake.
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
Your air test can only reach 125psi? The pumps making 4000psi, what if the leak only occurs at 400psi and above? The numbers I mentioned are high, higher than normal and those pumps are known to die, Remans are known to die, not unheard of bad from the box.
Can you reach 4000psi when it's running good?
Have you made sure the FICM plugs are snapped in tight?
I don't know the spec for 1200 rpm, just idle and 2500.
Can you reach 4000psi when it's running good?
Have you made sure the FICM plugs are snapped in tight?
I don't know the spec for 1200 rpm, just idle and 2500.
Lead Driver
Joined: May 2014
Posts: 6,545
Likes: 13
From: Virginia Beach VA
That's what I think also, the numbers are higher than they should be, especially if he has no leak.
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Logistics Pro
Joined: Mar 2013
Posts: 4,097
Likes: 23
From: Kissimmee,Fla
I had issues with the Ex for awhile and it was looking like it needed a HPOP, new screen was clogged up. Cleaned it out and I was good to go. He could also have a intermittently funky ICP issue to. They have a lot of heat there.
Thread Starter
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Freshman User
Joined: Mar 2003
Posts: 45
Likes: 0
From: Anola, Mb
It did it last fall, winter and spring with the old pump too. It will make around 4000 psi if i put my foot to the floor but it runs so bad i think it is going to break something in the trans or driveline.
Does having a modified FICM have something to do with no codes?
The HPOP replacement is in my signature
Does having a modified FICM have something to do with no codes?
The HPOP replacement is in my signature
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