JKim

When I went on the test drive with the shop foreman, I asked him if it could be caused by the driveshaft and he said he highly doubts it because everything in the car is moving at such a high rate of speed. He's saying it was to be the road or the tires. I drove from CA to AZ and had the vibration the whole way for 5 hours!!

Is it a fast vibration or a slow and long rythmic vibration? My car has a long vooom......vooooom........voooom vibration/sound. The vibrations are about 1-2 seconds apart and the "voom" is about 1-2 seconds too. My dealer is blamining it on the tires too, but I only have 11,000 miles.

Voran, Did you find out what was causing the noise/vibration?

I think I have the same problem. It's a voooom................vooooooom.............voooooom..............vooooooom sound right? Mine goes away when I turn right like when changing lanes or if I tilt my steering wheel slightly to the right. It starts at about 70mph and you can hear it and faintly feel it in the steering wheel and floor board. My dealer also said it's probaby most likely the tires. They said warranty won't cover it and since they didn't have any IS loaners to swap the tires and diagnose the problem I would have to either wait until my tires wear out and get new ones or I would have to buy new tire and wheels to see if the sound goes away. Have you still been unable to find what's causing it?