How do you adjust the throttle body on a BMW 740 il?

I'm not sure what you mean by adjust. There is now adjustment per se, but you can do a quick recalibration of the throttle sensor by turning the ignition on (not starting) for 10 seconds, turn the ignition off for 10 seconds, then starting the car. The effects of this procedure are questionable. The throttle body inself does not have any adjustments. It is driven by the computer based on the position of the accellerator and the throttle body position is read back by the computer to verify the position is correct. good luck, lc