Interior problem
1998 BMW Z3 6 cyl Two Wheel Drive Manual 20500 miles
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When we bought the car 2 years ago, the passenger seat would jerk forward/backward slightly with hard shifts or fast start and stops. We thought it would be a matter of tightening something up and didn't pay a lot of attention to it. Now the driver's seat is also slightly loose. We heard it's not a simple matter of tightening something. The seat motor is good, the seats adjust properly as far as I can tell, just that slight wiggle forward and backward, I guess on the rails.

When we got this complaint at the dealer, replacement of the seat rail was the only cure.

I fixed the same problem with this info. http://www.waycoolinc.com/z3/02/100602/shish01.html
The problem is fixed in 2 hours max.

I also found this http://www.youtube.com/watch?v=DM4KSnA58EI

I learn something new everyday! Bookmarked them both, thanks for the help!!