Knock yourself out, Ford loves selling parts.

If you want to get a new one for your own peace of mind then go for it. I've never read about a hot start being cured by a new IPR but there is a first time for everything.

Just be sure it's from Ford and not a knock off.

http://parts.autonationfordwhitebear...a/?parent=1072

 

Clean the junk from the valve (IPR), make sure the screen is good (new one is $30) and then put 12v to it and see if it moves.... before you put it in the truck. That valve is $270 and an ICP is $160.... that's half way to the HPOP...$700.

As Mike said above, hot-no-start is a pressure thing.

Your HPOP should put out nearly 4000psi once it makes a couple rotations and it should continue to produce 4000psi every second its running.

The IPR valve regulates how much of that 4000psi is directed to other things like injectors, based on demand. The remaining pressure is sent back to the reservoir of oil in a round-about way... maybe a trip thru the oil cooler or whatever.

The ICP reads how much pressure its receiving (its in the HPO discharge line downstream of the IPR) and sends that reading back to the PCM and in turn, IPR closes/opens depending on the load required. So its a feedback of actual pressure received. You could just unplug it, the PCM does have a set of defaults to use if that happens.

Your truck can't make enough pressure to make the injectors fire, the ICP say's only 360, PCM say's sorry, I need 500psi minimum. Hot oil is thinner, it flows easier. A cold truck builds the pressure because the oil is very thick. If you unplug the ICP, it will use 875 as the default number, that's more than the PCM needs to fire... but the truck can only produce 360 and the injectors still can't fire because they need 500psi to open.... There isn't enough to physically operate them.

 

I tried powering up the IPR and see no movement at all, I pumped air into the end, energized it ad the air continued to flow with no change. That's my question, if the IPR is bad (the one that was in the truck appears to be the stock one with 130k miles on it but the screen was clean) and is stuck in the open position would it not allow for pressure to build up? I replaced the ICP and pigtail already so assuming the part is working correctly we can take that out of the equation. One good thing about this is I've become extremely proficient at the ICP and IPR removal and replacement procedures, anybody in the CT area I'd definitely give a hand too!

 

You said that you have a hot-no-start issue. A stuck IPR would be a NO-Start issue all the time, not just when hot. The numbers you posted in the very first post, indicate a working IPR.

Your wasting your time and possibly your money... your HPOP needs replaced.

 

Yes if the IPR is stuck open it may not let pressure build

But with a working pressure range of 0-4000 psi it does take a fair amount of pressure to move it

I pushed on mine with a screwdriver fairly hard for only about 1/8" movement since this HPO System is high pressure Low Volume

As far as seeing movement when power is applied you should see none

As far as change of sound when power applied while blowing air into end there's a lot of variables for testing it this way NOT the Best way
#1 the air tube would have to be sealed just to the tip
#2 the air pressure would have to hit into the 500 psi range since this system is such high pressure in a fairly broad range I'm sure the valve uses operating pressure of the HPO System to open

Using compressed air on this system to test usually only yields results on parts that are totally failed




I think its Awesome your trying to be thuro in your diagnosis but everything you have posted is 9/10 a Failed HPOP

 

I certainly have waited an *** load if time. I will begin breakdown later today, I really do appriciate the help! I'll post more as I get in there.

 

You can look at it that way.. or, you've learned a hell of a lot about the truck!

 

Just by dumb luck when I went threw this I Pulled the HPOP cover off and unhooked the Discharge tube from the pump and stoped for the Night


I came back out the next morning and noticed the HPOP was letting the reservoir bled thru it I knew that wasn't right and it might be the case I shut the truckoff in just the right spot for this event to happen




I had a couple posts from my thread I dug up but its not letting me quote them????


My pump didn't spin freely it would lock up in a spot which is what I think he will find

 

Ok, I'm back, I needed to get some work done to make some money to pay for this thing...a nice rainy day today and the pump is out! It spins freely without any weird noises, all of the O-rings appear to be good and the tube coming off the top of it had very little play on the other side of it. The ball bearing is also still in place on the side of the pump. Is it safe to assume that something on the inside of the pump isn't working correctly and I just replace the pump and O-rings???

 

You can check the seal but, if it's not making enough pressure, replace the pump and orings.

 

Ok, I'm on it. I was so hoping that one of the orings was blown out. That was a fairly big job getting that sucker out! Hopefully I'll have it back together later this week...thanks again

 

I'd look at the Adrenaline pump. The OEM pumps are re-man and pure junk. Some guys report having to put in several until they get a good one. Once and done you say... Adrenaline!

 

This is a #3 plow truck I've been trying to get rid of prior to the winter so I have to try a less expensive one. I will however jump off a bridge if I put one in and it doesn't work!!

 

Make sure the waters deep in the spot your going to pick... ha

 

So, new pump is in, fired up after a little cranking, let it idle while I put tools away and still have a hot no start. I'm looking for a tall bridge to jump off as I type.......