Throttle Valve

CIS-E Throttle Valve:

The Throttle Valve is mounted on the intake manifold inlet downstream of the mixture control unit. The Throttle Valve is of the two barrel side draft type with progressive throttle linkage. The function of the Throttle Valve is to regulate air flow into the engine, the more it is open the greater the air flow into the engine. Throttle Valve operation is controlled by the throttle cable and the accelerator pedal. The Throttle Valve does not control idle speed, this is done by a separate idle stabilizer valve. You adjust idle speed on CIS-E Motronic systems not by fine adjustment of the Throttle Valve, but by controlling a small amount of air that is allowed to bypass the throttle. This is more reliable since it's independent of throttle cable stretch or wear in the throttle valve mechanism.

CIS-E Motronic engines (code 9A) have idle and full-throttle switches mounted either separately on the throttle valve housing, or in one case underneath at the bottom of the housing. Some early CIS-E Motronic engines have only a single idle switch.