I have noticed for the past week or so, that when I drive my TL, I can hear and feel the car shaking and vibrating. The fast I go the worse it gets, I seem to remember my TL pretty smooth, now its a rough ride wherever I go. I just passed 9000 miles, and the car is 11 months old. I don't have any aftermarket parts and the tires are the one's that came with the car. (Not the summer tires). Anyone else having this problem? What could be wrong?

 

if they arn't the summer tires...then most likely u have the EL42's which are the worst tires u could probably put on a car, they wear fast and are just terrible. this could be the source of ur vibrations. aswell as you might have a bent rim, which can cause serious problems. if u hit any potholes or curbs lately id get ur wheels checked out.

 

Can you hear and feel this at idle? Then it may be your exhaust system (muffler).