How do you set idle speed on Mercedes 190E 1.8 Bosch fuel injection?

To set the idle speed on a Mercedes 190E 1.8 with Bosch fuel injection, first ensure the engine is at normal operating temperature. Then, locate the idle adjustment screw on the throttle body; you may need to remove a protective cover. Using a tachometer, adjust the idle speed to the specified RPM (usually around 800-900 RPM) by turning the screw clockwise to increase or counterclockwise to decrease the speed. Finally, check for any air leaks and ensure the throttle linkage operates smoothly.