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Old 15-02-2020, 12:09 PM   #1
Franco Cozzo
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Default Fiesta ST intermittent vibration - worn upper engine mount?

Afternoon all,

Old man's WZ ST has an intermittent vibration that feels like a rough idle, it's a vibration you can feel through the car where it does it some days and not others.

Mostly when it's warm and has been driven 50+ km.

Ford dealership suspects it's a worn top engine mount ('collapsed' was the terminology they used) which is apparently common on Fiesta, car has 115,000km on it.

They didn't seem too certain though,

Replacement price is $485 fitted, I'm a bit hesitant to have this done as I feel like they're playing partsnostics.

Car can torque steer pretty impressively some days and not others in 4th which is interesting, it sounds consistent with a toasted engine mount in a FWD car but not intermittently?

I've looked at the engine mount but it doesn't look 'collapsed' to me?

Also interestingly they quoted $785 fitted for a new set of front rotors and pads (3mm and 4mm of friction material left on pads)
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Old 15-02-2020, 12:44 PM   #2
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Default Re: Fiesta ST intermittent vibration - worn upper engine mount?

Engine mount could be the problem. But I’d take it to an independent mechanic for inspection. Ford are hopeless and charge a premium for that hopelessness.
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Old 15-02-2020, 12:54 PM   #3
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Default Re: Fiesta ST intermittent vibration - worn upper engine mount?

You can easily check the engine mount yourself. Look under or remove the coolant reservoir. You will see the rubber mount is inside an aluminium housing (exposed though). If the bottom of the rubber has collapsed you will see rub marks on the top surface of the bottom of the metal engine mount. A good mount will not rub. It will be a lot clearer when you see it for yourself and you can see what I mean.
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