Ok need some help, replaced HPFP 38,000 miles ago. Truck began going in limp mode without engine light, wrench came on in dash, gave codes for brake switch, anti-theft, some other weird codes. Had those codes cleared, ran for while then water separator came on, drained the water out, came back on. Read some forums, so I removed and cleaned the housing, cleaned off the sensor. Had code cleared and ran good for about a week. Then guess what engine light comes on, limp mode. Went to Auto Zone, pulled code P0088. This truck runs awesome until limp mode. No other problems. I take it to the ford dealer, scanner pulled P0088 and the water separator code again. I have read alot of remarks about this P0088 code. Can there be another cause for pulling this code, only 38,000 miles later. I had them do the TSB 12-07-07 but I have also read it can only be done if the P0088 is the only code. Please advise, my bill is up to $4500.00. I just really feel there is an underlying issue with these 6.4's. Thanks for any advise!!!

 

You have to drain the water separator monthly, run a good fuel lubricant, and there is a reflash for the P0088 that might fix your problem.

 

[QUOTE=bubbasz1;15120580]You have to drain the water separator monthly, run a good fuel lubricant, and there is a reflash for the P0088 that might fix your problem.[/QUOTE

OK they did the reflash but it was showing both codes, the P0088 and then the one for the water separator. Would the reflash not work then?]

 

reflash will still work. The reflash changed (loosened the specs to throw the code).


If you have the repeat sensor code then change the sensor.


For continued POO88 codes you will need a new HPFP. Just ensure there is no metal or rust in the top mounted fuel filter bowl.


Metal or rust means that you have contained fuel and will require more than just the hpfp.

 

Thanks for reply, I will replace water separator sensor, but remember this HPFP was just replaced 38,000 miles ago. Do you still think it needs to be replaced again?? I was hoping that everything I have read about this faulty P0088 code that it might be something else throwing the code, like EGR being replaced.

 

P0088 X X Fuel Rail/System
Pressure - Too High
This error will be set if the fuel pressure in the rail is too
high and the controller cannot regulate it to the setpoint.
20 % “overposition” of
the PCV [% PWM]
3% deviation of the fuel rail pressure
to the fuel rail pressure setpoint
Low pressure system, wiring to
VCV and PCV, FUP sensor, pump