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Old 08-10-2010, 08:20 AM   #1
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Join Date: Jul 2010
Location: West Chester, PA
Posts: 211
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
99 Boxster 5spd - 64k miles

06 Civic SI - 114k miles, D.D., unbelievably reliable and fun to beat on everyday.

08 Legacy GT 5spd - 74k miles.
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Old 08-10-2010, 08:27 AM   #2
Join Date: Mar 2006
Location: Seattle Area
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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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Join Date: Nov 2005
Location: Florida
Posts: 529
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:

Happy Boxstering,
Racecar spelled backwards is: Racecar!
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Old 08-13-2010, 06:06 PM   #4
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Join Date: Sep 2009
Location: New Hampshire
Posts: 39
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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