IPR & High-Pressure Pump Test

WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

If injection control pressure is still low after ruling out both cylinder heads as the source of injection control pressure leakage, perform the following steps to isolate the cause. Remove the high-pressure hose from the right oil manifold and cover the fitting. Install the plug from the Oil High Pressure Leakage Test Adapter Set (303-756) into the high-pressure hose to block it off. With the high-pressure pump effectively deadheaded, crank the engine and monitor the ICP PID. If injection control pressure is not within specification, replace the Injection Pressure Regulator (IPR) with a known good IPR and retest. If a low pressure condition still exists, the problem is most likely with the high-pressure pump or the high-pressure pump drive gear.