This system is applicable to gasoline engines only.
Models using this system include the 1980-81 510, the 1980 200SX and the 49 state version of the 1980 810. The air induction system is used to send fresh, secondary air to the exhaust manifold by utilizing vacuum created by the exhaust pulsation in the manifold.
The exhaust pressure usually pulsates in response to the opening and closing of the exhaust valve and it periodically decreases below atmospheric pressure. If a secondary air intake pipe is opened to the atmosphere under a vacuum condition, secondary air can then be drawn into the exhaust manifold in proportion of the vacuum. Because of this, the air induction system is able to reduce the CO and HC content in the exhaust gases. The system consists of two air induction valves, a filter, hoses and E.A.I. tubes.