2001 7.3 High Pop Empty
Cargo Master
Joined: Apr 2022
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Fleet Mechanic
Joined: Dec 2006
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screen in before pump so aluminum pieces would have to travel the length of the oil system to make reservoir basket, not sure if that’s possible.
Cargo Master
Joined: Apr 2022
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Possibly . They rarely fail 100% though. Usually just get weak. But it's possible. Could pull ipr valve and look for metal on it though.
Cargo Master
Joined: Apr 2012
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From: Bottom Of Pikes Peak
Lately I've been seeing many HPOP threads...okay probably only several.
you're probably right as I've only known of 2 incidents first hand in the past 5yrs or so. So what do you think it is, LPOP? there's only a couple things that can cause zero oil flow. It's too bad the OP doesn't have access to a spare parts truck
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Fleet Mechanic
Joined: Dec 2006
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that's what i used to think about IDM's because I've never seen one fail....but they seem to be failing at least weekly on the forums mainly east of Colorado.
Lately I've been seeing many HPOP threads...okay probably only several.
you're probably right as I've only known of 2 incidents first hand in the past 5yrs or so. So what do you think it is, LPOP? there's only a couple things that can cause zero oil flow. It's too bad the OP doesn't have access to a spare parts truck
Lately I've been seeing many HPOP threads...okay probably only several.
you're probably right as I've only known of 2 incidents first hand in the past 5yrs or so. So what do you think it is, LPOP? there's only a couple things that can cause zero oil flow. It's too bad the OP doesn't have access to a spare parts truck
check out video of oil flow out of hpop, what do you think about lpop?
Lead Driver
Joined: Oct 2005
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From: Ponca City, OK
The front engine cover that the oil pump gear rides against is aluminum.
Even if every spring in the hpop broke and every piston seized in it's cylinder oil would still get to the rails when the ICP was pulled. The oil will gravity right through and out the discharge ports as long as the reservoir is full and a rail is open to atmosphere it will flow.
Even if every spring in the hpop broke and every piston seized in it's cylinder oil would still get to the rails when the ICP was pulled. The oil will gravity right through and out the discharge ports as long as the reservoir is full and a rail is open to atmosphere it will flow.
Cargo Master
Joined: Apr 2012
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From: Bottom Of Pikes Peak
so you are getting oil flow? too much mixed info in here....this is why I stayed out of it and let the others try to help you.
Still hpop or IPR but like someone said, probably the hpop but
it's one or the other or both. I thought I remember you saying 65% duty cycle which usually points to hpop.
someone also mentioned getting the proper items to test actual pressure on ea side of the pump using a gauge as well as plugging the IPR hole. I think there are kits available now or you can easily get a gauge and fittings from the parker store if you have one
Still hpop or IPR but like someone said, probably the hpop but
it's one or the other or both. I thought I remember you saying 65% duty cycle which usually points to hpop.someone also mentioned getting the proper items to test actual pressure on ea side of the pump using a gauge as well as plugging the IPR hole. I think there are kits available now or you can easily get a gauge and fittings from the parker store if you have one
Lead Driver
Joined: Oct 2005
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From: Ponca City, OK
What is the resistance reading from the IPR coil? It should read around 10.5, but anything between 10 and 11 should be fine. If you have an old valve cover harness or don't mind robbing the ebpv connector pigtail to make a jumper for the IPR valve you can give it 12v straight from the battery. If the valve works at all this will hold it closed and act like a deadhead plug. If you decide to try it you don't want to leave it connected for more than a minute or so at a time. It is literally forcing the valve to 100% duty cycle and will eventually burn out the coil. If it work though that tells us the pump and valve are likely fine and that the signal from the PCM isn't getting to the valve. If it doesn't I believe it's time to start backtracking the hpo system trying to figure out why oil can't get through the pump.
Lead Driver
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From: WV
Originally Posted by RacinJasonWV
It should shoot across the truck and into the driveway.
I agree with Tpayne. Either the IPR or HPOP are done if your reservoir was full while not getting oil out of the ICP hole. Seems like most people have at least a little bit of flow when the IPR is bad so I’m leaning towards HPOP. I think using an IPR block off tool could confirm.
I agree with Tpayne. Either the IPR or HPOP are done if your reservoir was full while not getting oil out of the ICP hole. Seems like most people have at least a little bit of flow when the IPR is bad so I’m leaning towards HPOP. I think using an IPR block off tool could confirm.
Test the IPR coil resistance first. Easy and free.
While the IPR is out, I assume you can also apply voltage across the IPR pins and see some type of movement of the spool valve. If not the spool itself, the oil in the holes should move a bit. Someone else will need to confirm this though because I’ve never tried it.
After looking at the IPR, I would buy an IPR block off tool and go from there. Simple ands gets straight to the point.
Install the tool and crank with ICP out. If oil doesn’t shoot out of the hole then the HPOP is bad. If oil does shoot out the hole then either the IPR or associated wiring is bad.
I think this “air tester” would work if you put a pipe plug in the external hole of the tool. Otherwise you can buy one from Riffrafff for like $40.
Udsuth’s 12v method may work for a similar test, but if the IPR is completely shot then it won’t work for the test. I think the results would still be questionable which is why I recommend blocking it off instead.
Cargo Master
Joined: Apr 2022
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Lpop is fine by looking at video he posted other day. My money is on ipr valve or corresponding wiring for it. Which is what I've been preaching since the beginning lol