Removal and adjustment of throttle valve cable

to remove throttle cable simply hold throttle linkage in place and pull the cable end piece firmly toward the front of the vehicle, snapping the end piece loose from the linkage. the second part of your question is more difficult as there is no adjustment of the cable possible. i would assume the manufacturer of this tower is aware of this and it would be designed correctly to accommodate correct tension in the throttle cable.

Where the throttle cable attaches to the throttle body unscrew the adjustment collar, pull the plastic adjustment collar out of the rubber grommet, push the rubber grommet backward off the throttle bracket, remove the plastic end by sliding the cable through the side that is slotted and remove the cable. You will most likely have to buy a new rubber grommet from your local BMW dealer. To reinstall just reverse what you have done. I am a certified Mercedes/BMW mechanic and have attended all the schools from 1972 until 1995. If you wish to replace your operational cable with a very expensive new cable then do operation #1.