Recommended 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:
If the engine does not start during this procedure verify the batteries are fully charged, plug in the block heater and cycle the key several times to activate the glow plugs.
This test identifies non-contributing power cylinders and determines if the injector spool valves are correctly operating.
- Turn off all accessories. If the vehicle is equipped with a power take-off (PTO) system or auxiliary idle control, it must be turned off to carry out the Power Balance test.
- Refer to the scan tool operating manual for instructions.
- Key in OFF position.
- Key ON, engine running.
- Start the Power Balance test and monitor the cylinder power contribution for 8 seconds. Identify and record the non-contributing power cylinders.
- While the Power Balance test is running, use the output state control to turn off the idle compensation strategy. Monitor power contribution for 8 seconds, identify and record the non-contributing power cylinders.
- With the idle compensation strategy turned off, increase the engine speed to between 800 and 900 RPM. Monitor power contribution for 8 seconds and identify and record the non-contributing power cylinders.
- Install a new fuel injector for the cylinders identified as non-contributing power cylinders, refer to appropriate FUEL CHARGING AND CONTROLS article. Air may be present in the high pressure oil rail after the repair. It may be necessary to operate the vehicle for 24-32 km (15-20 miles) to remove excess air.
- Verify operation of the bank 2 check valve. To isolate bank 2 check valve disconnect all bank 1 injectors.
- Start the Power Balance test and monitor the cylinder power contribution while the symptom is occurring. Engine misfires should be constant on the 4 cylinders with the disconnected injectors. The 4 cylinders with the injectors connected should be contributing evenly.
- Connect the bank 1 injectors and verify operation of the bank 1 check valve by disconnecting all bank 2 injectors.
- If the 4 cylinders with the injectors connected do not contribute evenly or display erratic, install a new check valve for that bank.