Air Injection: Description and Operation

This system is used on some vehicles to reduce carbon monoxide and hydrocarbon emissions by adding a controlled amount of air to the exhaust gases through the exhaust ports. This causes oxidation of gases and an appreciable reduction of carbon monoxide and hydrocarbon emissions.
Although a properly operating system will effectively reduce emissions, if any system component or engine component operating in conjunction with the system should malfunction, emissions may be increased.
The basic Thermactor Air Injection System consists of an air injection pump, a centrifugal filter, an air bypass valve, check valves, air manifolds, tubes and hoses necessary to connect the various components.
Carburetors, distributors, and air pump system components on Thermactor equipped vehicles are designed for specific engine applications and should not be interchanged with units from other vehicles.