Hello,
I have a 2000 Solara and for the past several months I've been having some noise and vibration, mostly at highway speeds. At first I thought this was my tires - I had two of them that were cupped. However, last week I replaced all four tires and the noise and vibration are still there.
The strange thing is that it's not constant. There are times when I don't hear (or feel) it at all at high speeds, and there are times when I feel it at much slower speeds. Oddly enough it seems like it happens more (or maybe I just notice it more) on very smooth roads. There are times when it's bad enough that my steering wheel is shaking, and other times it's not much more than noise. It seems to be worse when I apply the brakes.
I've had all four tires replaced, all four have been balanced. I suspect it might be a bent rim, but my mechanic says that would be detected when they do the balance. The alignment has been checked and is fine...
So what else could it be? Any ideas would be appreciated.