Thank you, everyone for you replies and suggestions. The switch on this year/model car is a stem, column mounted. No where does it say engage. "Off is down or up, Accelerate is in towards the dash, deaccelrate is pulled towards the driver. The manual indicates I should push the stem into the column to engage. Nothing happens when I do this. When I hit accerate at any speed the car accerate violently, downshifting, and the rpm jumps up about 1,000 rpm, then suddenly it settles down at the speed I had hoped to set. The car can be adjust up or down normallly and runs perfectly. I really love using the cruise on my othercars but this one scares the hell out of me. 1992 535I SE