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Intermittent Steering Wheel Jerking When Coasting

intermittent steering wheel jecking coasting pulsing front end noise

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4 replies to this topic

#1 OFFLINE   KG-Virginia

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Posted 15 March 2017 - 06:49 PM

I have a 2013 1.6L EcoBoost Fusion with just over 45.5k miles.  Recently it has started to exhibit an intermittent steering wheel jerking when I begin coasting.  It only occurs after 30-60 minutes of highway speed driving, then occurs at almost any speed upon removal of my foot from the gas pedal.  There is an associated rumbling noise in the front end when the steering wheel twitches/jerks.  It sometimes occurs during acceleration and during braking, but mostly during coasting (no gas, and no brakes).  Sometimes this results in a pull to one side or the other but it is not consistent -- sometimes no pull at all.  The steering wheel will move between 5-15 degrees when this happens.  I have taken it to the dealer and an independent repair shop -- neither can get it to do it while they test drive it (they don't drive it long enough under the conditions mentioned above) and no codes in the computer.

 

This is not the typical out of balance or out of alignment problems -- very familiar with those symptoms.  Sometimes it reminds me of the digital nature of ABS pulsing during heavy breaking.  The frequency (cycles per second) of the twitching and rumbling does appear to be loosely tied to the speed -- lower speed, lower frequency; higher speed, higher frequency.

 

I'd appreciate any feedback wrt similar symptoms









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#2 OFFLINE   eGuru

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Posted 16 March 2017 - 01:33 PM

When did you last service the front brakes?



#3 OFFLINE   KG-Virginia

KG-Virginia

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Posted 16 March 2017 - 06:55 PM

12-15k miles ago -- Dealer turned the rotors.  I get it inspected annually by the dealer and have routine maintenance done.  They also flushed the brake lines at that time.

 

Why would it only occur during coasting if it's a brake problem?  Is there a feedback between the engine and the brakes ala a vacuum connection?  E.g. coasting equals low vacuum?

 

Seems like the highway time to get this to occur is decreasing -- now 20-40 minutes.  I don't know any details about the steering and brake design and interconnection.  I am an engineer with a good grasp of electronic controls, electrical power, hydraulics, and the fundamentals of mechanical rotating machinery.

 

It's been cold here in VA for the past month and I have been using the floor heat regularly.  Today on my drive back home, I turned down the floor heat and switched off traction control for a few minutes.  The symptoms seemed to decrease -- unfortunately changing two variables at the same time can give false leads/conclusions.  Where is the electronics module located?  Could the floor heat be affecting it after 30+ minutes of thermal soak?



#4 OFFLINE   eGuru

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Posted 17 March 2017 - 08:54 AM

I was suspecting that you are experiencing a sticky brake caliper and damaged or  perhaps warped rotor.

The caliper could be binding more after warming up during the drive.

You could probably eliminate this as a cause by checking your rotor temperatures at the end of your drive to see if one is hotter than the others.



#5 OFFLINE   KG-Virginia

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Posted 19 March 2017 - 06:35 AM

I'll check into this and let you know what the results is.  Thanks.






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