After IPR replacement getting 3500 ICP and 5% IPR at idle. Based on these numbers am I correct in thinking the IPR is stuck open, or not getting a signal? Can someone suggest diagnosis?
LivinNSin
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It works the Other way around though...
"Open" would have so much pressure being bleed off that the ICP would be very Low. Stuck "Closed" means the ICP is very High (as 3,500 is and I assume you had normal pressures from it before you changed the IPR?) BUT,,, remember that the Only reading you can get from the IPR is what the PCM is commanding it to do (and with a maxed-out ICP it would be commanding as low as it could - that 5%). The IPR has no Feedback to tell you where it really is.
So, the first thing I have to ask is, it this a Real, Ford/IH IPR or one from the Auto Parts Store?
"Open" would have so much pressure being bleed off that the ICP would be very Low. Stuck "Closed" means the ICP is very High (as 3,500 is and I assume you had normal pressures from it before you changed the IPR?) BUT,,, remember that the Only reading you can get from the IPR is what the PCM is commanding it to do (and with a maxed-out ICP it would be commanding as low as it could - that 5%). The IPR has no Feedback to tell you where it really is.
So, the first thing I have to ask is, it this a Real, Ford/IH IPR or one from the Auto Parts Store?
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Yea, similar IPR, they have a screen, we don't but you can open it up if you want to -> How to Rebuild the IPR on 7.3L Power Stroke Diesel | Diesel IQ
But,,, if it turns-out to be bad you should just be able to return it and, if looking "tampered with", you might not be able to.
Here's what happens with the IPR though, because of where it's located the plug that goes to it is subjected to a lot of Heat (and maybe Oil from HiPres hose leaks) so those wires often get their insulation pretty well Baked and it's common for that insulation to crack and fall off. Take a really good look at the IPR's connector and the wires that go to it.
The "testing procedure" of applying 12v to it (which also forces it Fully Closed) works but, I'm not sure what that's gonna tell you, it's more often we see stuck IPRs that are stuck Open, and out-of-the-box Closed would mean it's just put together Wrong I'd think...
But,,, if it turns-out to be bad you should just be able to return it and, if looking "tampered with", you might not be able to.
Here's what happens with the IPR though, because of where it's located the plug that goes to it is subjected to a lot of Heat (and maybe Oil from HiPres hose leaks) so those wires often get their insulation pretty well Baked and it's common for that insulation to crack and fall off. Take a really good look at the IPR's connector and the wires that go to it.
The "testing procedure" of applying 12v to it (which also forces it Fully Closed) works but, I'm not sure what that's gonna tell you, it's more often we see stuck IPRs that are stuck Open, and out-of-the-box Closed would mean it's just put together Wrong I'd think...
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What's being sent to the IPRs coil is a rapid cycle of power from On-to-Off (Open = Off / Closed=On). This makes the valve (pintle) inside go from bleeding-off pressure to keeping the full pressure that the HPOP is making. This gives the system a average between the two and is how HiPres Oil gets regulated by it (the PCM has a Table it uses to meet Power & RPM needs and changes that %).
So, what you read is that % of Open/Closed that's being sent to it (again, it's a percentage of CLOSED that we read). There is no 100% (as when you apply 12v to it) and there is no 0% because it takes time for that pintle to move back & forth (I think the Max is really around 65%, although some scanner sw might say higher, and 5% is as about as Low as it goes when running)
When you say "Actuator", is that the Coil that surrounds the stem? There are two parts to the IPR and the coil is what's doing the actuation by pulsing the magnetic field that works on the pintle inside the stem. If Bad, and it can't create that field, so the pintle would just be blown-back by oil pressure, giving you no resistance to a full bleed and Low ICP (which isn't what's you're seeing).
So, what you read is that % of Open/Closed that's being sent to it (again, it's a percentage of CLOSED that we read). There is no 100% (as when you apply 12v to it) and there is no 0% because it takes time for that pintle to move back & forth (I think the Max is really around 65%, although some scanner sw might say higher, and 5% is as about as Low as it goes when running)
When you say "Actuator", is that the Coil that surrounds the stem? There are two parts to the IPR and the coil is what's doing the actuation by pulsing the magnetic field that works on the pintle inside the stem. If Bad, and it can't create that field, so the pintle would just be blown-back by oil pressure, giving you no resistance to a full bleed and Low ICP (which isn't what's you're seeing).
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Yea so that does sound like you received a bad (maybe even counterfeit) IPR ~ That Sucks 
And if you look at the link above, on rebuilding the IPR, all that should be holding that part into the HPOP is the friction of the O-ring.
Hopefully,,, it will just pull-out for you...
And if you look at the link above, on rebuilding the IPR, all that should be holding that part into the HPOP is the friction of the O-ring.
Hopefully,,, it will just pull-out for you...
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