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Old 03-19-2016, 02:48 AM   #1
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Ford V10 engine slightly surging climbing mountains

On my last 2 trips with mountains to climb, I had an incident on each trip when in T/H and in 3rd gear. At around 2700-3400 there was slight surging in RPM. Only lasted until speed or gears changed. Nothing shown on the dash tach, Scangauge tach or trouble codes. When I tried to duplicate it today on the way home, I couldn't.
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Old 03-19-2016, 06:39 AM   #2
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I had something similar on my work pickup. 07 Ford F-150. Basically when I was going up hill under load, I would get a surging or hesitation feel. Even though it didn't throw a code, it basically just need a tune up, new plugs and wires. This was when I had about 150,000 miles on it. I currently have over 200,000 and it hasn't done it since.


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Old 03-19-2016, 10:15 AM   #3
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I had something similar on my work pickup. 07 Ford F-150. Basically when I was going up hill under load, I would get a surging or hesitation feel. Even though it didn't throw a code, it basically just need a tune up, new plugs and wires. This was when I had about 150,000 miles on it. I currently have over 200,000 and it hasn't done it since.


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Thanks, but this is a new MH, 6K on the odometer.
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Old 03-19-2016, 11:28 AM   #4
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Probably just the torque converter.


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Old 03-19-2016, 12:53 PM   #5
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On my V10 Class C I had surging problems, especially at city traffic speeds. Turned out there was a tech bulletin on it that one of the shift sensors (there were 6 or 7 total) was not telling the tranny when to shift. Replaced the sensor and fixed the problem. I bought the sensor on line and did the simple replacement myself. Check for tech bulletins (not safety recalls) with a Ford dealer.
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Old 03-19-2016, 12:54 PM   #6
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BTW, my unit at the time was a 2005 Coachman Leprechaun.
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Old 03-19-2016, 01:05 PM   #7
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Thanks, but this is a new MH, 6K on the odometer.
My 2015 does the exact same thing when climbing a mountain pass in lower gear. If you find a solution, please share. My local Ford dealer does not work on motorhomes, and the one that does is a major inconvenience to get to. I will need to bite the bullet and go at some point since I should get the oil changed soon!
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Old 03-19-2016, 02:01 PM   #8
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V10 surging

I have a 2015 FR3. We have pulled from sea level to 8000 ft with no problem, but my mechanic friend told me that these engines love to rev, so he recommended always using the tow/haul mode and let the motor spin.
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Old 03-19-2016, 02:52 PM   #9
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Try a different grade of fuel. Maybe you got a tank full of E15. That will certainly cause an issue!
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Old 03-19-2016, 05:26 PM   #10
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If you find there is no mechanical problem try 5star tune. The programming as it comes from Ford is not optimized for motor homes. After we installed it the trans shifted much better. It no longer jumps into over drive going over overpasses.
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