In the Powerstroke fuel system, the Injection Pressure Regulator (IPR) controls the oil bypass circuit of the high pressure pump. The Electronic Control Unit (ECU) controls fuel delivery to the injectors by increasing/decreasing the IPR duty cycle which increases/decreases fuel pressure through the injectors.
If you encounter low oil pressure,poor idle, stalling or no-start difficulties, the problem may be with the IPR unit. Remove and inspect the IPR o-rings for wear or damage. Often replacing the o-rings will fix the problem ans is much less expensive than replacing the complete IPR unit.
Now available is the Injection Pressure Regulator Repair Kit which includes the o-ring and jam nut needed to service the IPR unit.
Remember, when reinstalling the IPR unit to torque the IPR to 35ft/lbs and do not use sealer on the IPR threads,as there is an orifice in the threaded area which the sealer could plug.
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