My 97 Taurus GL sedan (3.0 Vulcan) has the following symptom:
When driving (either straight or around bends) between 5-30MPH, i can hear
and feel a sharp tapping coming from the front drivers side. It's not very
loud, but can be felt in the pedal and heard if you listen for it. The tap
seems to be once per tire revolution. I checked the tire for obvious
problems (a bottle cap or nail, etc) and everything seems fine. There isn't
any shaking (IE, the rim isn't bent).
After 30MPH, it's not as noticeable (actually, I believe the taps just blend
into one another).
It started all of a sudden a few days ago, nothing out of the ordinary has
happend to the car that i can think of, i haven't driven over a curb or hit
a pothole at 60 mph, etc.