Air Injection: Description and Operation

The air injection system aids in reducing hydrocarbons (HC) and carbon monoxide (CO) in the exhaust stream by introducing a controlled amount of air into the exhaust gases. The system consists of a belt driven air pump, an air control valve (either a diverter valve, diverter valve and [1][2]air switching valve, diverter/pressure relief valve, or switch/relief valve), rubber hoses, check valves to protect the hoses and other components from hot exhaust gases, and injection tubes.

1981-82 models with 6-225 and V8-360 engines exc. Calif., and 1982 models with V8-318 engine exc. Calif., do not require the divert function in the diverter valve, therefore, are equipped only with a relief valve.