So as I said in a thread earlier my hpop and ipr valve went out. Ford said it was missing on cylinder number 7. Could this be linked to the hpop going out and it will run fine when it is replaced here or is it more likely that i will need to replace an injector too? Or could it be something else?

The truck shut off driving down which i assume is because the hpop and ipr going out.

 

Almost immposible for both the IPR and HPOP to go out at the same time.

 

well the icp was out and i replaced that so i think the ipr went out then the hpop or the other way around...its just not my month to say the least

 

what my question was though in the OP is could the HPOP and IPR valve being out cause the cylinder to miss fire?

 

Why do you think they are both bad? Pull the ipr and see if the screen is still intact. I am betting it isnt. If not, put a ipr in and start the truck. And no, it wouldnt cause a single cylinder to misfire. When your truck died did you lift off the go pedal and it suddenly died?

 

Yeah i came up to a stop sign n the truck just shut off

 

Matty if the IPR screen isn't intact, couldn't the HPOP be "shedding" some pieces and be causing the IPR screen to tear?

 

Sure, it is possible. But why spend $2000 before checking the IPR? There is ALOT of things that can cause the IPR screen to fail other than the pump failing. All that is in a 03 hpop is some gears really, and to this day we have NEVER had a bad hpop, early or late model. I have HEARD of hpops loosing the check ball causing a gross leak, but that is easy to check for with the IDS. Ramp up ipr duty cycle, watch icp pressure while cranking. With a bad ipr you will see a couple hundred psi at 85%. If you did infact blow the check ball out of the pump, you will be hard pressed to see 100 psi at the icp. That little hpop resevoir screen is torn in probably 75-85% of the trucks I have pulled apart, allowing any piece of crap that gets picked up in the oil to get turned into a flying bullet to the ultra fine ipr screen. I personally had a truck do this same thing. Accelerated the truck, lifted off the throttle, and boom. Truck shut off like someone flipped a switch. Pulled the ipr and the screen was wadded up in the ipr. Who knows why, but I havent put a hpop in that truck yet, and that was about 60000 miles ago.When you suddenly lift off the throttle, you cause a pressure spike at the ipr. Thick oil, piece of sludge, or just a week screen can cause the ipr to fail. That doesnt mean your $2000/with labor, hpop needs replacing, does it?

 

Yeah well its at the shop right now I'm going to ask for the old parts the take off so well see here I guess

 

It can be a "catch 22" in a way can't it. If you replace the IPR (which he did already as mentioned in Post #3) and it is damaged again so quickly, then something is not right. So when do you decide you have to dig deeper?

Good to know that you haven't seen any HPOP failures. I have seen a few posts on failures over the years, but not very often. Who knows how accurate the failure diagnosis was. There is even a Techtime video on HPOP failures IIRC.

As I understand it, if an HPOP does fail, it will more than likely take out the IPR, but a bad IPR, certainly does not neccesarily point at an HPOP issue.

Certainly not challenging you, but just trying to make sure all the pieces add up in my head.

thank you.

 

Like $93.00 for the ipr at international if you are a shop. I didnt take it as you challenging me. I just hate it when the dealers automatically tell the customer they need a hpop. I have helped 3 or 4 guys on here that got the same diagnosis from the dealer through p.m.s. Guess how many needed a hpop? NONE, and the latest one was around christmas. All those trucks are still running without a hpop replacement.

 

we see pumps from time to time most are infact the early style. I do see more trucks then matty most likly.

he is right most of the time its just a failed ipr. I have see icp pressures ranging from 0 - 300 psi with a failed ipr though.
repeated IPR failers are normally caused by lack of maintace. this causes a build up of sludge and tar ***** under the oil cooler and when that screen fails they get sucked thre the pump and tossed in the ipr killing it.

 

When you see the early hpop fail, is it generally the check ball blowing out?

 

This is why this site is so great. Three of the best in the 6.0 field have contributed in the last 12 hours or so. I just spent some time on the RV forum trying to tell some people about why they need to come here for advice, not there.

 

we see that, And yes it can be fixed and the pump will work fine after, been there too. I have also seen a few volume issues from them and the pressure still be good. strangist damn thing.
all the ones like that I have seen I have been able to make run on one bank at a time. swich banks and retest it will run. hook oil lines to both banks only cranks.

we have had a few late models fail too. but as you said its just not that common.