Air Injection Reactor System: Description: Notes

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 HC and CO by injecting air into the exhaust ports, which induces further burning of exhaust gases. Two new valves were introduced in 1980 to provide additional functions along with standard divert air functions. Single valve systems will direct air from the air pump to either the exhaust ports or divert it to the air cleaner or intake manifold. Two valve and integral valve systems add air switching functions to those of the single systems. This system is used with the dual bed converter emission control system. The air switching function will divert air flow either to the exhaust ports or between the catalytic converter beds when the catalytic converter is up to operating temperature and the emission system switches to "closed loop".