Recommend Procedure:
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2007 Ford RV Cutaway, 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
The compression pulses indicate the combustion gas is leaking into the fuel rail.
- Disconnect bank 1 and bank 2 return fuel lines from the secondary fuel filter.
- Install a latex balloon over each fuel line and secure with the tie strap.
- Disconnect the fuel pump and the fuel injection control module (FICM) relays.
- Crank the engine and observe latex balloons for compression pulses. Identify which bank is a cause of the concern.
- Remove all but 1 glow plugs from the bank that leaks the combustion gas in the rail. Crank engine and observe latex balloon for compression pulses. Repeat this procedure for the 3 remaining cylinders on the same bank.
- For cylinders that leak combustion gas into the fuel rail, remove the injector and inspect the lower O-ring. Replace if necessary. Refer to appropriate FUEL CHARGING AND CONTROLS article. Carry out the Combustion Gas In The Fuel Rail Test to verify the repair. When the repair is verified carry out the Electric Fuel Pump Pressure test.
If the lower O-ring is OK, install a new fuel injector copper gasket, then remove the injector to inspect the copper gasket for an even circular crush pattern. If the crush pattern is visible install a new copper gasket. Refer to appropriate FUEL CHARGING AND CONTROLS article. Carry out test Combustion Gas In The Fuel Rail Test to verify the repair. When the repair is verified carry out the Electric Fuel Pump Pressure test.
If the lower O-ring and the copper gasket are OK, install a new fuel injector. Refer to appropriate FUEL CHARGING AND CONTROLS article. Carry out the Combustion Gas In The Fuel Rail Test to verify the repair. When the repair is verified carry out test the Electric Fuel Pump Pressure test.