Air Injection System: Notes

Air Injection Reaction (AIR) system is used to reduce carbon monoxide (CO) and hydrocarbon (HC) emissions. The AIR system provides additional oxygen to continue combustion process after exhaust gases leave the combustion chamber. This added air also brings catalytic converter up to operating temperature more quickly when engine is cold. The AIR system diverts air either to the exhaust manifold ports or to the air cleaner.

The system consists of an air pump, an Electric Air Control (EAC) valve (2.8L engine) or an electric air control valve with relief tube (4.3L and V8 engines), solenoid, check valve(s) and plumbing. See Figure or Figure