bucking only certain rpm - Ford Powerstroke Diesel Forum
 
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post #1 of 6 Old 11-07-2013, 11:49 PM Thread Starter
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bucking only certain rpm

Hello again...I may have posted this question awhile back...excursion wants to buck...or act like half the engine is running between 1400 and 1700 rpm...and only if steady. If I accelerategoes away. If I let off it goes away. It is like an instantaneous jerk....surge....I have changed the cps and it seemed to make difference but is still doing it. Would the ill behavior be stored in memory if the vehicle. I have also tried a new potentiometer with no change.

Never does it from a cold start until it had been running for ten to fifteen mins.

Thx
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post #2 of 6 Old 05-05-2014, 05:14 PM
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Next time it happens turn your cruise control on. If that fixes the bucking, it's your throttle position sensor. When mine got warm after 30 miles or so, it would start doing the same thing.

Currently OWNED by a 99 7.3! Here for help!
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post #3 of 6 Old 05-10-2014, 12:27 PM
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I actually just had my truck in for somewhat of the same reason. Check you IPR, it may have come loose.

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post #4 of 6 Old 05-10-2014, 07:33 PM
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I have one that's doing the same thing. Ive changed the cps and the throttle pedal with no change and its starting to get more frequent. I did a contribution test today and #8 comes back. I'm wondering if I've got a injector going bad.
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post #5 of 6 Old 05-18-2014, 03:29 PM
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Mine used to do the same thing, when it started it did it at the same intersection every day I left for work, just like you said mash into the throttle or let off n it goes away. It did it consistently for a few months then it became very random and less frequent, now it might do it 2 3 4 5 times a week , sometimes it goes a while without doing it, btw it started 8 years ago, never figured it out. I've had a new cups and ICP since then, no change. Fyi if your IPR is unplugged it won't run, the valve is the open position when no voltage to it.
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post #6 of 6 Old 05-18-2014, 03:40 PM
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Fyi cups= cps according to my smart phone
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