Start Problems... Help
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Junior User
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The engine was running, and then it quit and we can't get it started again. There is not much air in the reservoir. Heads are full of oil as is the reservoir.
The Buzz test was fine and injectors are working.
Question, if you try to start with the ICP pulled and it doesn't start, it indicates that there is a problem with the pressure, where if it did start it only indicates a problem with the sensor, right?
Our "mechanic" is trying to tell us that even if there is no pressure it should start in "limp mode" ie the ICP removed. (think its time to fire the "mechanic") But hey we're just sign guys right!!
We are located in Prince George BC, you can phone my husband at the shop at 1-877-563-9011 his name is Elvin, Tell the receptionist it is urgent - Thanks.
The Buzz test was fine and injectors are working.
Question, if you try to start with the ICP pulled and it doesn't start, it indicates that there is a problem with the pressure, where if it did start it only indicates a problem with the sensor, right?
Our "mechanic" is trying to tell us that even if there is no pressure it should start in "limp mode" ie the ICP removed. (think its time to fire the "mechanic") But hey we're just sign guys right!!
We are located in Prince George BC, you can phone my husband at the shop at 1-877-563-9011 his name is Elvin, Tell the receptionist it is urgent - Thanks.
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Another question, is is possible if you unhook power to the IRP is it constantly dumping pressure? Like if it has a faulty groud or something, is it not able to build pressure in the hpop? (another idea the mechanis had). Although, we checked all the wiring and it all seems to be fine too.
Post Fiend
Joined: Apr 2004
Posts: 12,835
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From: Silver Lake Dunes, MI
if the truck were to start with the ICP unplugged it would point toward a faulty icp sensor. if it doesn't start with it unplugged then yes there could be a problem with the pressure. And at this point since you can see the 230 psi on the scanner and the truck still didn't start with the sensor unplugged the sensor is good and the pressure is bad.
as far the IPR I believe that as power is applied the IPR opens allowing pressure to go to the heads. so with it unplugged it dumping the oil pressure. I have never tried to put power to the IPR to send all oil to the heads. It could be bad for the IPR but I don't know.
you also said the buzz test was good so that rules out IDM or wiring issue for the injectors.
Is the HPOP currently on the engine the one that was on it when it was running? if it is not I would switch the hpop's again and see what you have. But before you do that try just swapping the IPR's. Then if that doesn't work swap the whole pump out.
as far the IPR I believe that as power is applied the IPR opens allowing pressure to go to the heads. so with it unplugged it dumping the oil pressure. I have never tried to put power to the IPR to send all oil to the heads. It could be bad for the IPR but I don't know.
you also said the buzz test was good so that rules out IDM or wiring issue for the injectors.
Is the HPOP currently on the engine the one that was on it when it was running? if it is not I would switch the hpop's again and see what you have. But before you do that try just swapping the IPR's. Then if that doesn't work swap the whole pump out.
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We did try to swap IPR's last night, it didn't work, again it improved the pressure slightly, but only by 30 - 40 psi. The hpop that is on there now is the one that was on when it started. We are trying to pressure test it on its own now. We might tryto put the other one on. The one that is not on the truck now is the original one from the truck we pulled the engine from, so we know it worked too. We'll just keep plugging away at it.
As for the wiring for the IPR the ground is good, and there doesn't seem to be an issue there.
As for the wiring for the IPR the ground is good, and there doesn't seem to be an issue there.
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
ok sorry I thought you just cleaned the IPR that is on it now. yes If you can dead end the hoses with a pressure gauge that will give you a good idea what is going on with the HPOP. Let me know what you find.
Post Fiend
Joined: Apr 2004
Posts: 12,835
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From: Silver Lake Dunes, MI
if you end up with good pressure from just the pump then you are looking at injector o-rings next. do you know how long the engine sat before you got it? maybe the o-rings are shot and were good enough to start then once they got warm they blew and that has caused no starts in the past.
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Sorry I was misinformed, this hpop was changed out after it fired originally. We tested the hpop pressure and it is reading at 300 psi, so I am assuming that it should hoild a whole hell of alot more than that. As it should be 500 psi to fire, but it should be at ~3500 psi running, is that correct?
We will swap out pumps now and see if that works.
We will swap out pumps now and see if that works.
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
running wide open throttle you should see about 2500 psi up to 3000 psi. but you are correct 300 won't do a thing!
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pulled hpop from the truck. It appears as if the gasket is not sealing, or not sealed properly when the mechanic put it back on. Would that explain the low pressure and the small amounts of air in the pump?
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We have life!!!! Swapped the hpop and changed the gasket. 1500 psi. It turned over with a little bit of cranking!!! Lets hope it's "smooth sailing from here! Thank you for all your help, we wouldn't be here with out it!!!
Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
Originally Posted by signguys
Now... We are getting an error message, ICP voltage not at expected level.
If it comes back, let us know.
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Clearing the codes worked, the truck is going for it's maiden voyage as we speak!!! I would like to know though, if that gasket that was between the hpop reservoir and the pump was replaced broken (it was siliconed at the break points), if that had anything to do with the loss of pressure from the hpop? Like maybe this was the problem all along????
