rpm decreased drematicly the quickly shoots up - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 09-03-2013, 07:18 PM Thread Starter
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rpm decreased drematicly the quickly shoots up

94 f250 xl turbo

today i was driving an it dropped 500 rpms then quickly shot back up causing a bad jerk. loss power then regained its self then kept going.

need help manual tranny
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post #2 of 3 Old 09-05-2013, 11:14 PM
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The lack of replies in the 911 column amaze me sometimes. I wonder why I even ask for help here instead of just going straight to the 94-97 section.

Do you have any other symptoms you can give? What speed were you in, what gear, how much throttle? Do you have any gauges measuring oil pressure? fuel pressure? etc?

For now I'm gonna guess IPR (injection pressure regulator) but your description was kind of vague. It could me plenty other things. I had my IPR done last november. Sometimes my idle would jump up or down a bit. It gradually got worse, then when in gear and acclerating it felt like a loss of power for me and it was a lurch making me rock a bit in my seat.

Do you got a scanner by any chance that can monitor live data? I just picked up an Aeroforce Interceptor. Check it out!
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post #3 of 3 Old 09-06-2013, 12:06 AM
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By 94 are you a 94.5 with the Direct Injection 7.3 powerstroke, or an Early 94 with the IDI 7.3 turbo? big difference and we can't help without knowing, same displacement, completely different engines.

If it's a powerstroke, the throttle is electronic and there is a sensor on it called the Idle verification sensor, or something like that and it causes the truck to drop back to idle. Mine would do this from time to time until I replaced the whole pedal assembly. It was completely random, would happen once a week or 5 times a day. Usualy I would shift and then when I would get back on it, nothing happened. Let off and try again it and it would be normal.

Please check out my 7.3 Enthusiast Facebook group! All are welcome!
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