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Old 08-10-2010, 08:20 AM   #1
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99 Boxster - harshness/resonance at 2300-2400 rpms

Hi all,

I'm curious if my front motor mount is going bad (some resistance to shifting), and maybe this is linked to it, but I'd like to confirm this isn't just a normal resonance in Boxster's.

When engine braking, in ANY gear, from 2400-2300 rpms the car vibrates. In lower gears, it's enough to make some metal bits rattle a tad (i.e maybe a heat shield).

I've seen this in other cars where it's a natural resonance that occurs under a very specific circumstance and is no big deal. Was wondering if that's the case in the boxster 2.5 liter, or if it's more than likely something resonating because it's loose.

Thanks all
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Old 08-10-2010, 08:27 AM   #2
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My car doesn't do it.
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Old 08-11-2010, 02:41 PM   #3
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Have you ever replaced...

... the engine mount?
What's your mileage.
I've found that after 45,000 miles they crack and will give you weird vibrations.

Here are the instructions to replace it yourself:
http://www.pedrosgarage.com/Site_3/Install_Front_Engine_Mount.html

Happy Boxstering,
Pedro
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Old 08-13-2010, 06:06 PM   #4
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I have the exact same vibration. although I have no shifting issues. I have not looked at my engine mount yet but I plan on doing it this winter....
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