Recommended Procedure: (F-Super Duty/Excursion - Early Build): Notes
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2004 Ford RV Cutaway, 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, and 2004 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
- Air Pressure Check (F-Super Duty/Excursion - Early Build)NOTE: An air leak on the high pressure oil pump shaft lip seal is normal while performing this procedure. This is not an indication of a high pressure oil leak and the high pressure pump should not be replaced for this condition.
- Verify base engine oil pressure. Refer to the appropriate ENGINE article for additional information.
- Check the operation of the IPR valve. Remove one of the valve covers from the engine. Apply regulated shop-air pressure to the high pressure oil rail using the adapter from the Oil High Pressure Leakage Test Adapter Set 303-766. With air pressure applied, an air leak will result from the IPR valve's normally open state. With KOEO, use the scan tool to increase the IPR valve duty cycle. The IPR valve should close and block the air leak. If no change is heard, the IPR valve is not functioning as commanded. GO to PINPOINT TEST R: INJECTION PRESSURE REGULATOR (IPR) for IPR circuit DTCs. If no DTCs are present, install a new IPR valve and retest.
- With the IPR commanded closed, check the high pressure oil system for leaks. A leak may exist in the following areas: