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Old 11-02-2015, 08:08 AM   #1
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Can Bad Motor Mounts Cause Cabin Vibration?

Hi Everyone,

My aunt has a 2012 Focus SEL Sedan with about 50k miles on it. when the throttle is increased (even in park) there is an awful vibration in the cabin. Multiple panels make a high frequency buzzing when the gas is stepped on. When first described to me I figured it was just a loose panel like the quality craftsmanship on my Charger (sarcasm) but it's all over in the cabin so I figure it's got to be something causing the vibration rather than a bunch of panels becoming loose all of a sudden.

Car was bought used in 2014 with 34k miles on it and it did not rattle when bought. I don't believe you can hear the rattle from outside the vehicle either.

Any thoughts?

Thanks!


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Old 11-02-2015, 12:28 PM   #2
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Mount could do it, common in higher mileage older models but not yet with the MkIII.

Unusual failures are still possible, saw one with a totally failed driver's side mount to the trans.. That's something I hadn't seen posted on ANY before that.
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Old 11-02-2015, 03:03 PM   #3
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Quote:
Originally Posted by sailor View Post
Mount could do it, common in higher mileage older models but not yet with the MkIII.

Unusual failures are still possible, saw one with a totally failed driver's side mount to the trans.. That's something I hadn't seen posted on ANY before that.
Sailor, I don't know if you remember but I think MK1 where prone to have rocks and stuff caught in between the engine mount and frame.

Dunno if it still applicable to the MK3...
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Old 11-02-2015, 03:12 PM   #4
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I would do a visual inspection of all the mounts and see if they look rotten, torn, or otherwise unusable. See how much the engine rocks when giving it gas.
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Old 11-02-2015, 03:23 PM   #5
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Quote:
Originally Posted by ELCouz View Post
Sailor, I don't know if you remember but I think MK1 where prone to have rocks and stuff caught in between the engine mount and frame.

Dunno if it still applicable to the MK3...
Still possible, never common but often mentioned for a check. Undertray pretty much prevents it with MkIII if still there.

Heck, loose a tool in the wrong place and it could jam in a mount. Visual check needs a mechanic's mirror or equivalent to be thorough.
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Old 11-02-2015, 03:50 PM   #6
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Quote:
Originally Posted by mcbeighcon View Post
I would do a visual inspection of all the mounts and see if they look rotten, torn, or otherwise unusable. See how much the engine rocks when giving it gas.
The stock rear mount is weak on the MK3... possible that's shot
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Old 11-03-2015, 08:23 AM   #7
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Thanks everyone!

Glad to know there is some validity in my thought. I'm just thinking if not this I have no idea what one thing could cause the rattling. Next time I see the car I'll open the hood and have someone rev it, maybe go pick up a mechanics mirror at harbor freight as well. lol.

Would this be covered under the Powertrain warranty by any chance? If not does anyone know how much a dealer would charge to replace the rear motor mount? I think my aunt bought some extended warranty when she purchased it as well but I have no idea what that would cover.

Thanks again!

EDIT: I did take video of the rattle/hum from inside the cabin, I'll post it when I get home tonight.
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Old 11-03-2015, 12:32 PM   #8
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Think it is covered by that actually, from posts here.
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Old 11-05-2015, 10:51 AM   #9
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Quote:
Originally Posted by sailor View Post
Mount could do it, common in higher mileage older models but not yet with the MkIII.

Unusual failures are still possible, saw one with a totally failed driver's side mount to the trans.. That's something I hadn't seen posted on ANY before that.
What did the failure look like? Is the trans mount fluid filled?
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Old 11-05-2015, 10:58 AM   #10
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That was a warranty repair and only saw a picture of the engine tilted to the driver's side, none of how it failed.

Trans. mount is rubber damped and the design would normally not allow it to drop even with complete rubber failure. More info. would have been interesting to see but not forthcoming.
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