7.3 runs great for awhile and then loses power - Ford Powerstroke Diesel Forum
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Old 12-04-2010, 05:37 PM
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7.3 runs great for awhile and then loses power

I have a 7.3 it runs great for around 30 miunutes depending if I am on the interstate and then loses power. The first time this happened I thought I had some bad fuel so i pulled in to a station and got some more fuel when I started it back up it ran great again. Then the next day it did the same thing. I drained the water seperater and replaced the filter and it ran great again and did the same thing. I checked the fuel filter and there was no water or dirt in the filter. I thought there might be something in the tank because after shutting it off and restarting it would run well again. So I dropped the tank and it was clean inside the debri or anything inside of the tank. So the parts guy gave me a cam postion sensor to try it. Does anyone have any ideas before I replace the sensor.
thanks
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Old 12-05-2010, 06:42 AM
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My dad is having the same problem with his 01 model. We changed every sensor u can think of. Now he brought it to a shop and said an injector is bad. I dont know if this helps you out. We gonna have all the injectors rebuilt and hopefully it will fix the problem
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Old 12-05-2010, 06:57 AM
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the cam sensor doesn't cause lose of power, it causes the engine to shutdown. i had the same problem w/ my 96 7.3L (lose of power) a few years ago, ended up being the injector driver module (IDM) was dying.
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Old 12-16-2010, 05:53 AM
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update I ended up having to replace the in tank fuel pump. If you take that pump apart there are small screens inside the pump that they do not tell you about they were full of plastic from when the pick up screen fell off. After going through all of the trouble of removing the tank I just replaced the pump now it runs great
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Old 12-16-2010, 06:22 AM
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My dad said there is no fuel pump in the tank. Just screens. And return lines.
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Old 12-16-2010, 07:40 AM
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My truck has a plastic tank and the in tank fuel pump looks just like the type of pump that is used with gasoline engines. I also know that some models have a fuel pump mounted on the frame rail I wish that was the kind I would have had.
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Old 12-16-2010, 08:05 AM
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That is most likely a fuel mixing valve if it is a super duty
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