Pulse Air System: Operation

When vehicle exceeds set speed of speed sensor and manifold vacuum is above set vacuum of control switch, control switch solenoid valve and control switch are open. Thus, manifold vacuum is applied to air suction diaphragm valve to open secondary air passage.

When negative pressure induced by pulsation in exhaust manifold makes air suction reed valve open, fresh air enters exhaust manifold. Bellows of control switch compensates switch operation in response to atmospheric pressure. Air chambers act as silencers to reduce exhaust noise.