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7.3 randomly dies need help
Hello, new to the forum. I am writing a post for my father who is out visiting and his truck is giving him hell.
1997 7.3 turbo (not California)
The problem: The truck was running great then randomly died. My father thought that he might have ran out of fuel while driving because the tank was really low and he was about to swap out tanks. I don't know if it ran out or not. Now the truck will start sometimes, but dies randomly. We went through all the forums here first trying just about every fix listed. First we replaced the filter, no luck. Then we replaced the CPS and the truck seemed to run great even under moderate to heavy acceleration. Then when they left this morning it died again after about 50 miles and would not start. Then we replaced the lift pump and it again fired right up. As soon as he tried to accelerate the truck died and would not start. The ford mechanic suggested the ICP sensor so we replaced that and the exhaust backflow sensor at the same time. Still will not start.
What we have replaced:
exhaust back pressure sensor
We have verified fuel pressure to the filter bowl, but don't know how to verify discharge pressure from the high pressure injector pump. The fuel in the tank is good and both tanks are full and we verified operation of the tank switch. Any help would be greatly appreciated.