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Bad Vibration at Idle - Motor Mounts?


JQG4
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Hi all

 

I have a 2016 LWB with 122k miles.  It runs great, other than an occasional really bad vibration at low idle.  Moving to neutral reduces vibration, which makes me think motor mount.  Has any one else changed mounts because of a similar issue? Any idea on costs?

 

Thanks!

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I have a 2017 work TC with the same mileage and I also have a bad vibration at idle. While a misfire could definitely cause the symptom, I'm more inclined to think weak engine mounts. My spark plugs were replaced at 120k and there was no difference in the vibration. Today's computer systems are very sensitive to misfire conditions as when a cylinder misfires, the unburned fuel goes out the exhaust and can internally melt catalytic converters if it continues. The oxygen sensors will quickly detect this and illuminate the check engine light. If consistent - think dead coil or spark plug etc, the check engine light will flash to get your attention. I have not had my engine mounts replaced, but plan on bring the issue up at my next service interval, which is coming up soon. I'll re-post after a diagnosis.

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I agree that it would take a significant misfire to cause hard idling. 

 

The rear engine/transmission mount greatly dampens vibrations. I installed a hard rubber performance-type mount and this created unacceptable vibration and rattle at idle. This motor mount is very easy to inspect and change. Two bolts are easy to access once the vehicle is raised. Look for broken rubber in the center section.

 

 

Screenshot_20220123-072709.png

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I just had it at the garage. Of course it's an intermittent vibration and of course they couldn't duplicate it. Motor mounts and belts all look fine. This is a place I generally trust.  They checked the vehicle end to end, and all I ended up with was a $71 shop fee. The attached video might give you a better idea of sound, though it's short to fit the 10 Meg limit.  

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