We have a 1999 F550 Super Duty(7.3l). For the last year has BEEN running very rough. I just changed the CMP sensor and changed the IPR Injection pig tail bc it was kinda messed up hoping that would solve this but it hasn't. The Service Engine light comes on but nothing comes up on the Scan Gauge II Scanner. I don't know where to look now. Should I start thinking this could be a injector problem? What is the best was to check out each INJ? The truck starts up ok for a few seconds and runs fine. Then the Dervice Eng light comes on and runs bad. When driving it has a big loss of power as well.

ANY AND ALL HELP WOULD BE MUCH APP! Want to get this truck fixed and back to normal. Miles on this truck are only 68,489

Also I checked out the ICP Inj Pres Reg. No oil in top and tried unplugging it while running and it made the motor run worse. Plug back in and it ran like it is running now.

Also it does take a few cranks to get it fired up.

 

bump bump.....

 

I can't help much other than to suggest you post your issue on the 7.3l forum. There are some pretty smart guys over there.

Good Luck

 

Opps. Thought I had it in the right spot. Thanks man