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Strange Suspension problems
Anyone who could help figure this out???
I bought a set of new tires a week ago. In process of attempting to
align the car, it was determined that the left front side could not be
aligned and required a trip to the frame shop. (Although I bought the
car used, I've supposedly had it aligned twice with no problems. The
ride was "rougher" than I was accustomed to, but I attributed it to
the quattro suspension).
I had the tires mounted and balanced and made an appointment for the
next day at the frame shop. I drove the car home - approx. 15 miles.
On the ride home, the car began to vibrate badly at 60 mph on the
expressway. I got off the next exit to check the tires, and it went
away as I slowed on the ramp.
The next day frame shop adjusted the front end and I then had a 4
wheel alignment done. The first day out of the shop it seemed great -
a much smoother ride. Yesterday at 40 mph the car began to vibrate
again. It continued for 1/8 mile until I stopped for a light. As I
slowed down, the vibration sounded like a rhythmic thump related to
the turning of the tire. It seemed to be coming from the left front.
When I started up again from the light, it was gone.
Doesn't seem to happen at a particular speed and it goes away for no
apparent reason. It's also very brief in duration. It happened
before the frame shop touched the car, so I don't think it was
something they did. The tires were the only change - could it be the
tires? It never happened before these tires were installed. What
could cause this that would spontaneously go away?
I'm stumped - any suggestions? Any help would be appreciated. By the
way, its a 1988 90Q.