IPR
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IPR
A common misconception of the IPR valve and it's function
Many people think that the IPR regulates HPOP pressure by increasing and decreasing pump pressure.
The IPR regulates pressure in the oil rails by releaveing pressure in the rail, not the pump.
The pump puts out it's designed pressure at all times as long as the engine/pump is turning over in relation to its speed.
This is why the PCM never commands the IPR to close more than 85% Deadheading this type pump can be a disaster.
According to Ford the design pressure is 4000 psi but can be much greater. I found this out because I did not want to believe what my scan tool was telling me.
I rigged up an adapter and screwed in a 10,000 PSI test gauge and cranked the engine. It was putting out 8600 psi way more than I thought they were capable of.
Many people think that the IPR regulates HPOP pressure by increasing and decreasing pump pressure.
The IPR regulates pressure in the oil rails by releaveing pressure in the rail, not the pump.
The pump puts out it's designed pressure at all times as long as the engine/pump is turning over in relation to its speed.
This is why the PCM never commands the IPR to close more than 85% Deadheading this type pump can be a disaster.
According to Ford the design pressure is 4000 psi but can be much greater. I found this out because I did not want to believe what my scan tool was telling me.
I rigged up an adapter and screwed in a 10,000 PSI test gauge and cranked the engine. It was putting out 8600 psi way more than I thought they were capable of.
Senior User
Joined: Nov 2014
Posts: 1,775
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From: France
a good HPOP should be pumping a set volume per revolution, it's the IPR that controls the pressure. As the HPOP ages the volume per revolution will reduce, and this volume will become dependant upon the rail pressure (and the temperature, hence the warm-start problem)
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