A system that injects fresh air into the exhaust ports or a thermal reactor, for additional conversion of carbon monoxide to carbon dioxide and combustion of unburned hydrocarbons (unburned fuel vapors) found in the exhaust gases as it comes in contact with the high heat in the exhaust manifold.
AIR INJECTION
Meaning of AIR INJECTION in English
English dictionary of automotive terms. Английский словарь автомобильных терминов. 2012