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Old 09-18-2019, 03:45 PM   #1
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Surging uphill - Solution

Our 2015 Ford V10 on an f53 was surging on acceleration. It was especially noticeable in the mountains. But no check engine light. That perplexed Ford service. They did not want know what to do if there's no check engine light

And it was intermittent. It would do it for a couple days and then not do it.

In Canon City Colorado an RV dealership had seen the problem before. And diagnosed it as a throttle control potentiometer problem. And that solved it when we replaced it. The part was $560 but the labor only took about a half hour to put it in under the dog house. And there was also labor for the road test with a diagnostic meter.
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Old 09-18-2019, 03:55 PM   #2
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Quote:
Originally Posted by Minnesota51 View Post
Our 2015 Ford V10 on an f53 was surging on acceleration. It was especially noticeable in the mountains. But no check engine light. That perplexed Ford service. They did not want know what to do if there's no check engine light

And it was intermittent. It would do it for a couple days and then not do it.

In Canon City Colorado an RV dealership had seen the problem before. And diagnosed it as a throttle control potentiometer problem. And that solved it when we replaced it. The part was $560 but the labor only took about a half hour to put it in under the dog house. And there was also labor for the road test with a diagnostic meter.
By any chance do you have an invoice with the part number on it for the part they replaced?
Lynn
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Old 09-18-2019, 04:26 PM   #3
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It looks like the throttle control is

9C3Z-9E926-C

And you need the gasket.

5C3Z-9E936BA

This is for a 2014 chassis Ford V10 f53
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Old 09-18-2019, 08:57 PM   #4
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Fancy name for a throttle body.
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Old 09-18-2019, 10:05 PM   #5
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We had to replace the full throttle body, as you call it. But it was not the main throttle body that was the problem, it was the potentiometer in the throttle body that was not moving the plates properly from the gas pedal signal. And you can't just replace that one part. So we had to pay 560 bucks for the whole throttle unit.
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Old 09-18-2019, 11:59 PM   #6
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Potentiometer available at parts.ford.com for $57.93.
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Old 09-19-2019, 12:26 AM   #7
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Ours was only available as a unit. I believe they said the problem was the potentiometer that reads the position of the throttle plate in the throttle body. I think there are several potentiometers in the system, our mechanic said.
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Old 09-19-2019, 06:21 AM   #8
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I believe they gave you two different stories of what your problem actually was.
If the throttle body was not reacting from the signal from the accelerator pedal sensor and the throttle plates were not moving properly you had a faulty driver motor (throttle body motor). The motor is available separately from NAPA as part #6005524. This is actually a Dorman part #911-102 and the motor comes with the gaskets. List price is $232.92 from NAPA.
The throttle position sensor is what reads the position of the throttle plates just like the name implies. This is mounted on the opposite side of the throttle body from the motor.
There is a potentiometer inside the TP sensor.
The list price from NAPA for the TPS part #260003 is $148.22. The TPS is a sealed part and the potentiometer inside it is not replaceable separately.
As a side note there are some especially younger mechanics who like to use technical words like potentiometer. They think they know what it is but don't really know but using the word might impress someone else with their use of the word.
I also have a suspicion the mechanic knew there was a problem within the throttle body but didn't really know what it was. Replacing the whole throttle body was a 'cover the basses' in my opinion.
The good news is they got you back on the road and running fine.
Lynn
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Old 09-19-2019, 07:06 AM   #9
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The "potentiometer" is really called a Throttle Position Sensor.
The "motor" might be an Automatic Idle Speed Motor (AIS). That adjusts the air bypass to control idle speed. Not sure if an F53 uses this or not.
Any other motor is for Cruise control. Not sure if F53 uses an electric motor or vacuum.
I don't think there are more than one TPS.

I doubt the whole throttle body was needed. But hopefully it's fixed.
A good diagnostician with a decent scan tool should have been able to nail the issue using State Displays ie: to see the TPMS voltage output across idle to full throttle.
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Old 09-19-2019, 07:57 AM   #10
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Quote:
Originally Posted by Dav L View Post
The "potentiometer" is really called a Throttle Position Sensor.
The "motor" might be an Automatic Idle Speed Motor (AIS). That adjusts the air bypass to control idle speed. Not sure if an F53 uses this or not.
Any other motor is for Cruise control. Not sure if F53 uses an electric motor or vacuum.
I don't think there are more than one TPS.

I doubt the whole throttle body was needed. But hopefully it's fixed.
A good diagnostician with a decent scan tool should have been able to nail the issue using State Displays ie: to see the TPMS voltage output across idle to full throttle.
The motor is not an idle speed motor. The motor opens and closes the throttle plates via a signal from the accelerator pedal position sensor. This is referred to as 'drive by wire'.
There is only one TPS. The potentiometer is a coil inside the TPS which has a brush which sweeps across the coil to change the resistance value through the sensor to change the voltage output in relation to the amount of throttle opening. The potentiometer would look something like a rheostat in a headlamp switch which controls the output to the instrument panel lamps. The TPS output is sent to the ECU which adjusts the amount of fuel required for the throttle valve opening.
I have replaced a few TP sensors on Ford V-10's but only one throttle body. That throttle body was on a high mileage low maintenance F-350 pick up which hauled a cattle trailer. The throttle plate shaft was worn, the brass bushings were partially missing and the shaft had actually worn into the body housing. Very erratic voltage readings from the TPS.
Lynn
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