Air Suction System: Operation

Air is drawn through air filter(s) and air suction valve(s) into exhaust ports of all cylinders on Pickup and Starlet, and into cylinders 3 and 4 on Tercel. The Pickup uses a system of control and switching valves and a computer to delay air suction during rapid deceleration, while the Tercel uses a restrictor to accomplish the same purpose. This prevents engine backfiring on deceleration.