96 F350 7.3L No power above half throttle - Ford Powerstroke Diesel Forum
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Old 07-26-2012, 08:03 PM
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Angry 96 F350 7.3L No power above half throttle

This is pathetic. I'm in the middle of a cross-country run pulling a 12,000 lb 5th wheel. Early in the trip I switched to the rear tank and lost power so I switched back to the front tank and full power returned in a few minutes. The next day I lost a cylinder so I put in in Indianapolis and turned the trouble over to "Turbo & Diesel Injection" who put a full set of injectors. The truck ran great until it blew an exhaust manifold gasket in Oklahoma. I put in in Amarillo, TX and went to the most highly recommended Ford diesel shop in town. He pulled the engine because the bolts had to be drilled out and tapped. He alse put in a new radiator, water pump and thermostat.

I picked the truck up at the end of the day and it drove terrific. Being behind schedule, I hitched up the trailer and took off that night. All seemed fine until I40 began to climb heading into New Mexico. That's when I realized that there was no increase in power above half throttle. I've limped all the way to Flagstaf, AZ with a top speed of 50mph on the flat and chugging up hills in 2nd gear at 2500rpm. I drained the fuel bowl and replaced the fuel filter but there was no change.

I still need to climb over the Sierras. What did they do to my truck?

Last edited by mnorth57; 07-26-2012 at 09:02 PM. Reason: I forgot something
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Old 03-10-2013, 09:08 PM
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have you figured out what it was. my truck has not increase in power over half throttle. its like the turbo is not spooling at all
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Old 03-10-2013, 09:24 PM
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Not much better...

I've replaced the injectors, fuel pump and exhaust manifolds. I have plenty of power and torque coming off idle but there's no additional power available in the second half of the throttle travel.

You don't really notice it when driving empty but the truck will barely pull an 8000 lb 5th wheel up a hill.
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Old 03-16-2013, 01:29 AM
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Have you had your fuel injector control module checked. Some of you performance issues fall into the category covered by this module. There is a video on this site that describes the symptoms and test procedures.
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