11-10-2023, 05:41 AM
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#1
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Registered User
Join Date: Nov 2023
Location: Madison, AL
Posts: 1
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Off/on Vibration above 70
I have a new to me 07 Boxster base, 58k miles. The PO put new Michelins on the car recently.
When I am driving above 70 mph, I get a quick shake, felt in the seat not the steering wheel, then back to smooth. Cycle repeats at about a 1 to 2 sec interval.
Looking around the net, sound like maybe a motor mount, since it seems to be rear end problem. Raising the spoiler earlier than 75 does not seem to make a difference. Speeding up, the cycle does not noticeably change in frequency. Top up or down does not seam to make any different either. Since it is not continuous I assume the tires are probably not the issue.
During the oil change I did not see any obvious issues with any suspension problems, but that does not mean the old rubber bushings needs replacing.
Any thought on what I need to look at.
Thanks.
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11-10-2023, 06:13 AM
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#2
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"50 Years of 550 Spyder"
Join Date: Jun 2015
Location: The Road
Posts: 944
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Try this….
….Loosen all the lug bolts and then re-torque them.
__________________
550 SE #310---"It's more fun to drive a slow car fast, than a fast car slow."
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11-21-2023, 06:54 AM
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#3
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Registered User
Join Date: Mar 2015
Location: Pittsford, NY
Posts: 53
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Perhaps rebalance the wheels/tires.
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11-21-2023, 06:48 PM
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#4
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Toppy
Join Date: Apr 2014
Location: Dorchester, ON, Canada
Posts: 140
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I had a similar issue, for me it was rear toe, when was the last alignment?
__________________
1999 Boxster
Arena Red/Graphite Grey Interior/Black 03 Top/550 All Red Tail Lights
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11-22-2023, 05:53 AM
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#5
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Registered User
Join Date: Sep 2006
Location: Omaha
Posts: 2,917
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Quote:
Originally Posted by tonythetarga
Perhaps rebalance the wheels/tires.
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+1
Since it's not in the steering wheel, chances are a rear tire is out of balance. Just bought a new set of tires and trip to Dallas was my 1st test drive. Now have a vibration at 70+ in the steering wheel that wasn't there with my worn out tires. Grrr. Will be going back for a rebalance when I get home.
__________________
GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
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11-22-2023, 06:44 AM
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#6
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Registered User
Join Date: Apr 2013
Location: Lincolnshire, IL
Posts: 499
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FYI....although it's a rarity, some tires are defective by being manufactured "out of balance". If that's the case it's almost impossible to balance them and they should be returned for replacement.
Years ago, a name brand, steel belted radial on one of my cars was impossible to balance correctly.......the reason: some of the steel belting "shifted" either while in use or during manufacturing.......it was replaced (at no cost) and I never had the problem again.
__________________
98' Boxster
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11-22-2023, 07:28 AM
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#7
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Registered User
Join Date: Mar 2020
Location: Phoenix
Posts: 122
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I’ve had wheel weights fall off within a couple days of installation and had to take them back
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11-27-2023, 04:55 AM
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#8
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Registered User
Join Date: Sep 2006
Location: Omaha
Posts: 2,917
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Quote:
Originally Posted by husker boxster
Just bought a new set of tires and trip to Dallas was my 1st test drive. Now have a vibration at 70+ in the steering wheel that wasn't there with my worn out tires. Grrr. Will be going back for a rebalance when I get home.
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Had some extra time while visiting, so I had a Discount Tire in Plano rebalance my tires. Vibration gone and trip back (other than the snow in Wichita) was great. When I was pulling the car out of DT, I asked the tech mgr if there was a tire out of balance. He said all 4 were!
Been chasing a vibration in the shark. Thought is might be worn out parts and have been parts exchanging chasing the vibration. I didn't start driving the shark a lot until I had the timing belt replaced, which was after I'd bought new tires (same Bridgestones as I bought on the CSS) from the same Discount Tire. Will be going to a different DT for a rebalance since it very well could be they didn't get them balanced correctly to begin with. Occam's razor.
__________________
GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
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12-07-2023, 04:44 PM
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#9
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Registered User
Join Date: Dec 2023
Location: Mass
Posts: 7
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I would make sure they are doing "road force" balancing and at the some time I would have them check to make sure the rims are all straight. When I got my 911 I noticed a very slight shake at high speeds, and it turns out all four rims were out of round. Got them fixed and now the car is smooth as silk. Had the same issue with the 2001 Boxster S
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12-11-2023, 05:45 AM
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#10
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Registered User
Join Date: Mar 2017
Location: Arizona
Posts: 184
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I chased the same problem for a long tome. Turrned out to be bent wheel.
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12-21-2023, 10:24 AM
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#11
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Registered User
Join Date: May 2023
Location: Oakland, CA
Posts: 198
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Were you able to figure out the cause?
Quote:
Originally Posted by snaward
I have a new to me 07 Boxster base, 58k miles. The PO put new Michelins on the car recently.
When I am driving above 70 mph, I get a quick shake, felt in the seat not the steering wheel, then back to smooth. Cycle repeats at about a 1 to 2 sec interval.
Looking around the net, sound like maybe a motor mount, since it seems to be rear end problem. Raising the spoiler earlier than 75 does not seem to make a difference. Speeding up, the cycle does not noticeably change in frequency. Top up or down does not seam to make any different either. Since it is not continuous I assume the tires are probably not the issue.
During the oil change I did not see any obvious issues with any suspension problems, but that does not mean the old rubber bushings needs replacing.
Any thought on what I need to look at.
Thanks.
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__________________
2001 Boxster S | Triple Black | Stock 17s | Bilstein PSS9s | BAD Shifter | 6x40w Cabrio Amp | 986.2 muffler
"Sixty percent of the time, it works every time!"
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12-21-2023, 11:27 AM
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#12
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Registered User
Join Date: Apr 2021
Location: Lansing, MI
Posts: 365
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How about worn suspension/weak shock absorbers?
__________________
Current rides: 2003 Porsche Boxster MT (me), 2019 Bolt LT (me), 2015 Audi Q5 (wife), 2008 VW Rabbit (2.5 inline 5, MT, well, for kid... but you now, it is the 5 straight)
Previous: 2014 Fiat 500e, 2016 KIA Forte5 SX, 2016 Fiat 500X, and some old days: Trabant, Fiat 126p...
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