'95 f250 7.3l interrminent loss of power and horrible idle - Ford Powerstroke Diesel Forum
 
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post #1 of 6 Old 05-27-2008, 01:26 PM Thread Starter
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'95 f250 7.3l interrminent loss of power and horrible idle

I have a major problem with my '95 F250 7.3l diesel. All of a sudden lost complete power and idled like it was starving for fuel. Engine light comes on. Engine light went off, everything was fine for the day. I get home and right before parking it the same thing happened. Lost all power, barely stumbled into parking spot. Opened the hood and the driver side valve cover was smoking and smelled like an electrical burn. Replace the valve cover gasket and the internal connection to the glow plug and injector.

She kicks over on the first crank but with the same problem. Stumbles as if starving for fuel with the engine light on. No codes ever come up. (maybe I need a specific scanner?) If I let it idle for 20 minutes, the engine light will go out, idles normally and all powers restored. Drives perfect. Then it will cycle through the same symptoms.

I have changed the oil, fuel filter, cps, fixed the wiring harness where the old valve cover connection had fried and cannot think of what else to do. I am hoping it is just a sensor such as the exhaust back pressure sensor, or the injection pressure sensor. I checked the Fuel Injector Module for water contamination and did not find any.

any suggestions?
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post #2 of 6 Old 05-30-2008, 06:44 AM
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post #3 of 6 Old 05-30-2008, 08:08 AM
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Did the new wiring harness get fried again? Could be a glow gone bad shorting out the harness (I believe I am saying this accurately). Also, when my IPR went out it did something similar.
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post #4 of 6 Old 05-30-2008, 08:14 AM
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Where are you located and what is the outside temperature when you are trying to get it running? It could be the exhaust back pressure valve is working to help warm up the motor.
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post #5 of 6 Old 05-30-2008, 10:50 AM Thread Starter
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Thanks for the replies.

The idea that the UVC harness may have fried again did not cross my mine. However, the truck started on its first crank after I replaced the harness with the same problem. It was not the case that it worked ok and then began again. I did think about the IPR (injection pressure regulator - correct?) but have not replaced it. I may try that as well.

The question regarding the temperature is an interesting one. I say this because when the engine finally starts acting ok and the engine light goes off, everything is ok as I drive it until I hit the exact same spot on the backroads that I use to test drive vehicles. This area tends to be cooler than the rest because of a near by creek and shade from the trees. Once I pull back into my neighborhood which is warmer, the problem has gone away. Happened three times this way and I thought I was just creating coincidences in my mind. I have not replaced the back pressure sensor.

The truck is in Maryland, the temperature while this happened has been fluctuating between 65 and 80 degrees over 3 days.
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post #6 of 6 Old 10-24-2010, 04:10 PM
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Did you ever get this taken care of? I am have what seems to be the same problem and am wondering if you found a solution?
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