99 7.3 hesitating going down the road - Ford Powerstroke Diesel Forum
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Old 12-27-2013, 08:35 AM
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99 7.3 hesitating going down the road

I have a 99 7.3 that was using some serious oil. I ended up pulling the injectors and replacing the O rings. That seems to have stopped the oil consumption but now I'm having other issues. After I replaced the O rings, I ran it to town and once on the freeway it ran great. Got off of the freeway and came down to a stop sign and hit a bump and it died. Got it towed and the got it fired up and it ran a few and then died. I replaced the cam shaft sensor and got it fired up again but had to really crank to get it to fire up. Once fired up, it ran but every so often it almost sounded like it didn't have enough fuel as you would hear it drop down and catch back up again. I then took it over to Advanced and they checked the codes and it said the ICP sensor. I replaced the ICP sensor and it cranked over much better and idled great but then I took it down the road and when I accelerate on the throttle it is great but once it catches up on the speed, then it starts doing this hesitating, almost stalling thing.
I did pyro the ports on the exhaust manifold after I had it running for a bit and each port was running around 160 to 180 so they all seemed even and I was told this would be a good way to see if I have an injector that isn't firing right.
I haven't run it back to someone to have them run the codes again after replacing the ICP sensor.
I'm wondering if there is something else that could be an issue?
At this point I'm considering pulling the valve covers again and pull the wires on the injectors, one at a time and see if I notice any change in how it is running.
I'm at a loss right now on where to turn next.
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Old 12-28-2013, 11:21 PM
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try to find someone with a scan tool that can do a buzz test, that will tell you if all the wiring is connected. Be careful playing with the harness to the injectors, it's about 115v DC and packs a punch. Our trucks are famous for problems with the UVC harnesses, could be the connector thru the gasket.

have you run it long enough to get all the air out of the fuel rail? 7.3's dead end the fuel into the rails, when you pull the injectors you'll get air in there, and it has to work out thru the injectors.
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Old 12-29-2013, 12:28 AM
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Any kind of different sound changes primarily with air or exhaust?

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