04-01-2011, 06:40 AM
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#1
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Registered User
Join Date: Jul 2010
Location: California
Posts: 1,859
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I have the exact same issue... Waiting to see replies on this topic.
Jager
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04-01-2011, 06:51 AM
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#2
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Registered User
Join Date: Aug 2009
Location: MD
Posts: 628
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In my car, it's independent of speed and get the vibration only when I'm slowing down throgh 3000 rpm. Whichever gear I'm in, if I'm slowing down in gear, I begin to feel the shake at ~3100, and ends as rpm passes 2900. I never get the vibration if I'm accelerating through 3000 rpm.
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04-01-2011, 07:34 AM
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#3
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Registered User
Join Date: Jan 2007
Location: BC
Posts: 1,346
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Quote:
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Originally Posted by JTP
In my car, it's independent of speed and get the vibration only when I'm slowing down throgh 3000 rpm. Whichever gear I'm in, if I'm slowing down in gear, I begin to feel the shake at ~3100, and ends as rpm passes 2900. I never get the vibration if I'm accelerating through 3000 rpm.
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+1.
I think JTP's not feeling it on the way up because the time spent in that rpm range when accelerating is very small.
__________________
2001 Boxster, 5 spd, Seal Grey
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04-01-2011, 08:09 AM
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#4
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Registered User
Join Date: Feb 2010
Location: Phoenix, Arizona Baby
Posts: 495
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I can even be on Cruise Control at 70 and I am getting the VIBE. To me it makes sense that its the motor mount. Thoughts??
__________________
2006 Hummer H3 - RED 76k mi - LIFTED - 3rd row custom seating on 35's and a manual tranny.
1997 Boxster Guards - RED 86k mi - 19" Lobster Claw Wheels on Conti's , Porsche side decal for extra "speed", manual tranny -signed by Hurley Haywood
Phoenix, Arizona
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04-01-2011, 09:04 AM
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#5
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Registered User
Join Date: Jan 2007
Location: BC
Posts: 1,346
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Again, if it's only at 70, then there's likely something in your wheels, alignment, etc. If you get the vibe in every gear at around 3000, then it's likely your motor mount, or your clutch, or the exhaust, or ???
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2001 Boxster, 5 spd, Seal Grey
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04-01-2011, 09:12 AM
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#6
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Registered User
Join Date: Jul 2010
Location: West Chester, PA
Posts: 211
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I had a vibe that occurred in every gear at 2300-2400 rpms. Pretty bad - shook the whole car mildly.
Gone with motor mount replacement and happened at all road speeds for the appropriate gear, so I knew it wasn't rotationally related or balancing/alignment.
__________________
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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04-01-2011, 09:23 AM
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#7
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Registered User
Join Date: Jun 2007
Location: Colchester, CT
Posts: 489
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There seems to be two causes of this. The front motor mount and the Dual Mass Flywheel. I just changed my DMF and that solved the 3000rpm vibration. Start with the front motor mount then move to the DMF next.
If you end up changing the DMF then do the IMS bearing at the same time...shared labor...assuming it is a 986 and not a 987.
Chris
EDIT: Oops I see in your sig that it is a 97 with over 70k in mileage. Chances are high you need it all; front motor mount, DMF, clutch, IMS....might as well change the AOS while you're there.
__________________
1999 986 2.5L, Stock Exhaust (S muffler), EVO Intake, 18" Stock rims (17" during winter), IMS Upgrade, 150k+ miles and counting!
87 944S brought back to life
Last edited by Dragonwind; 04-01-2011 at 09:25 AM.
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04-01-2011, 04:47 PM
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#8
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Registered User
Join Date: Aug 2009
Location: MD
Posts: 628
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Quote:
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Originally Posted by clickman
+1.
I think JTP's not feeling it on the way up because the time spent in that rpm range when accelerating is very small.
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Good point, I'll have to test accelerating at different rates and see if I notice the vibration.
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