Air Injection: Description and Operation

Fig. 1:

This system, Fig. 1, is used to reduce carbon monoxide (CO) and hydrocarbon (HC) emissions by adding a controlled amount of air to the exhaust gases in the exhaust system. This addition of air causes further oxidation of the exhaust gases with an appreciable reduction of carbon monoxide and hydrocarbon emissions.

This system consists of an air pump,a diverter valve (1971-76), an air switching valve (1977-82), a check valve, an air manifold and the necessary tubes and hoses to connect the various components. Cylinder heads used on engines with this system have drilled passages to conduct the air to the exhaust ports.