Mercedes® Air Slide Valve, 1978-1981 (123)

Idle speed is electronically controlled by means of the air slide valve, or idle speed adjuster. The air slide valve is a lifting magnet with respective aperture which permits variation in the air flow rate. The air is picked up after the air flow sensor plate, but before the throttle valve. Thus, the respective air quantity will be combined with the respective fuel quantity via the air flow sensor plate.