Wheel shake/shimmy over 63 MPH

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Wheel shake/shimmy over 63 MPH

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Cadillac >> General Technical Section >> Suspension sponsored by Arnott Inc. >> Wheel shake/shimmy over 63 MPH

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Wheel shake/shimmy over 63 MPH - 5/3/2008 9:50:19 AM

Jimkana

Posts: 2
Joined: 5/3/2008
Status: offline

Hello,
I picked up my 02 STS used with about 60k miles, it always seemed to have a tire shake. The dealer was a friend and his guys went over and over this car replacing and rebalancing etc but still it shook.
Finally we all agreed it must be the tires (lots of complaints on the internet concerning the Goodyears on it seemed to back that theory...)
So we drove it that way for about 25k miles.

Lately the Goodyears just wouldn't keep air for more than a couple days without popping warnings... and they made a kind of "squishing" sound at low speed... and the ride was deteriorating...These Goodyear's were not all that worn but they looked/sounded awful and there was that shaking at speed.

As a result I put a new set of Michelin's on it to the tune of about $1k.
The ride changed dramatically... It rides/handles like new...
EXCEPT:
On the way home it started to shake at about 63mph so after just one day I took it back and had all four tires rebalanced... and rotated... Although the shake seemed to "change" in quality it is still there.

So here I am: 2 different sets of pretty expensive tires, at least 4-5 balances done between them and lots of eyballs all over the car yet I still have this shake...

It really takes away from the enjoyment of driving this beautiful car...

I do also have an RSS code C0620 Right Front Position Sensor malfunction, but that only started recently after I had some work done under the hood...
Any ideas?
Thanks.
Jim