Truck dies at odd times. - Ford Powerstroke Diesel Forum
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Old 02-22-2014, 01:13 PM
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Truck dies at odd times.

Hi
I have a 95 f250 7.3 auto.

My truck is having some odd issues. When it is cold(20-35 degrees) it will start fine, but when i get to ~60 MPH the truck loses power, and dies. I have to let the truck sit about a minute, and crank it over twice while pumping the throttle. This only happens if I don't plug the truck in.

The other time this happens is only when the engine is warm it will cut out, and restart leaving a dead stop, or slowly accelerating(leaving a stop sign, or parallel parking).

Thanks.
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Old 02-24-2014, 07:15 AM
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Whats considered warm? Where is the needle on the temp gauge? That's more of a dummy gauge, I installed an aftermarket gauge and fixed my T-stat with a 203 and the gauge is at the M when fully warm.

Make sure it's fully warmed up before driving. I let mine idle for 5-10 minutes when temps are that low. If you have a high idle tune then that is better than a regular idle.
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Old 02-24-2014, 07:35 AM
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When it quits and won't restart initially, does the tach move as you crank it?

"Pump the throttle" does nothing. There's no throttle. There's no mechanical action to the pedal at all. The pedal is just an input to the PCM. The PCM ignores pedal position while starting. You also don't need to fully warm up the engine before driving it. Two mintes (apprx. the glow plug run time in cold weather) should be plenty. If you have stalling issues at full speed, you have a failure somewhere, and idling to warm up the engine, even if it did anything, would be just masking that failure.
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Old 02-24-2014, 12:24 PM
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When it does at a stop sign it's usually after I drive to town about 17 miles so it should be at operating temp. Outside temp doesn't seem to matter. It's usually the first stop I make after a long drive, but it's happened driving in town a few times too.

Idk if the teach moves when I crank it over after it sites at speed. I'll try to see if it will happen tomorrow and let you know what happens.
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Old 02-25-2014, 06:33 PM
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Well it didn't do it today. The only thing I did different today was use the rear fuel tank.

If it doesn't do it tomorrow I'll replace the CPS just to be safe since I have a spare in the garage.
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Old 02-26-2014, 05:51 AM
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Keep us updated, more things you try the easier it is to figure it out
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Old 03-04-2014, 08:17 PM
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Ok so it stalled again today. As usual it was as I was getting to ~50mph.

The engine loses power, but the electronics are ok. It's almost as if it's not getting enough fuel. The tach does move when I crank it over.
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