Air Injection Reactor System: Description
NOTE:
A Pulse Air (PAIR) Injection system is also used on some General Motors models. See "General Motors Pulse Air Injection System" article in this section.
The Air Injection Reactor (A.I.R.) system is used to reduce Hydrocarbons (HC) and Carbon Monoxide (CO) by injecting air into either the exhaust port of the cylinder head, exhaust manifold or catalytic converter. The A.I.R. system operates at all times and will by-pass air only for a short time during deceleration and at high speeds. The Air Management Valve performs the by-pass or diverter function. The Check Valve protects the air pump from damage by preventing a back flow of exhaust gas.