What AE Tests to run during drive cycle: Bucking and Surging at Constant Throttle - Ford Powerstroke Diesel Forum

 
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post #1 of 5 Old 11-14-2013, 09:17 AM Thread Starter
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What AE Tests to run during drive cycle: Bucking and Surging at Constant Throttle

Howdy,

Just got an oil change with 15w40 Rotella on the 97 7.3 liter.
Also just cleaned EPV tube and new sensor install.

Symptoms: I am getting a bucking and somewhat lesser occuring surging at highway speeds (@70 mph and 2000+ rpms)

NO CEL

I have been searching ad naseum for solutions.

I have AE with enhanced package. What live tests should I run while driving to help diagnose?

By the way my Transmission range sensor is in the yellow (voltage) but don't know if this would contribute to the symptoms.

Thanks

Last edited by countryroad; 11-14-2013 at 09:22 AM.
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post #2 of 5 Old 11-14-2013, 10:51 AM Thread Starter
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OK, did a little research and ran some live tests.

At WOT:

RPM: 2993
IPR Duty Cycle: 37.11%
ICP PSI: 2442

According to Riff Raff this means my IPR is OK I think. Anybody concur, so I can rule out IPR with my bucking?
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post #3 of 5 Old 11-20-2013, 05:57 AM Thread Starter
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I have made some replacements that I will report back on, but have a quick question.

I have the fuel bowl out, banjo bolt out and two bolts that were holding down the fuel pump out as well.

Can I pull straight out with care? Or if I should turn the crankcase over by hand, what is the best way to do that? Don't have large socket and no moving wheels right now.

Any help would be appreciated.
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post #4 of 5 Old 11-20-2013, 04:18 PM Thread Starter
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Did it with a 1/2" drive craftsman from below. No breaker.
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post #5 of 5 Old 07-22-2015, 02:06 PM
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I know this thread is over a year old now but I just ran across it and have been having the same kind of problems with my '97 7.3. It had been sitting for a couple of years before my mother-in-law gave it to my wife and I. I've been working on it for a little bit and have it running again but am having the same kind of bucking/surging, somewhat when accelerating, but mostly once I'm up to highway/Interstate speeds. What replacements did you make or what did you find to be the problem with yours?
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