Monday, August 13, 2012
Ford F-250 Super Duty XLT 6.0L The engine will not start when hot. It is not building enough Injection Control Pressure
VEHICLE: 2006 Ford F-250 Super Duty XLT 6.0L, V8, MFI, OHV, VIN P, Eng Version Power-Stroke, #Valves 32
The engine will not start when hot. It is not building enough Injection Control Pressure (ICP). The Injection Pressure Regulator (IPR) shows 85% cranking. The oil pressure gauge does show pressure when cranking and the oil has been changed.
1. If the oil supply is OK, check the ICP system for any leaks when it's not starting. When working on an F-series vehicle, remove the ICP sensor from the passenger side valve cover and connect shop air to the fitting in the valve cover. When working on a 2005 or newer E-Series vehicle, connect the shop air pressure to the test port on the high pressure pump itself (this is a port that normally has a pipe plug in it and can be accessed by removing the doghouse inside the vehicle). With air applied, turn the key on and either use a scanner to command the Injection Pressure Regulator (IPR) closed (if the function is available) or back probe the Yellow/Red (Y/R) wire at the IPR and ground it. There should be very little to no air heard in the crankcase with the IPR grounded.
2. If there is no difference in the air heard when turning the key on and grounding the IPR, suspect a leaking IPR or leak in the system. Remove the valve covers to check for any leaks at the injectors. If none are found, remove the rear engine cover to access the ICP pump and check for any leaking lines or connections and repair as needed.
3. If there are no leaks but there is air heard when pressurizing the system, suspect a faulty IPR. Replace it and recheck operation.
4. If there is no air heard when pressure testing the system, suspect a faulty ICP pump.
Injection Control Pressure Pump
Injection Pressure Regulator (IPR)
Replaced High Pressure Oil Pump Branch Tube Adapter: Replaced the Snap To Connect fitting.
Refer to TSB 08-9-9 (or 08-18-6 if available) for related information on pressure testing the ICP system and the Snap To Connect (STC) fitting replacement.
2006 Ford F-250 Super Duty XLT 6.0L The engine will not start when hot. It is not building enough Injection Control Pressure