1997 1.9 Z3 28 mph rumble
Rumble has increased in intensity during last 20k miles. Used to look for washboard pavement but finally learned problem is with car. Car has 145k mi. To be specific, when accelerating from stop or near stop, rumble strip type noise and vibration occurs between 28 and 31 mph. No problems at other speeds. Problem intensifies under heavy acceleration and is undetectable when I creep through the stated mph. Problem occurs whether in 2nd or 3rd gear. Dealership gave me a $79 inspection and suggested a $5k fix (imagine that). Anyone have similar issue? Any suggestions?