Regulation .05 Air Injection System (AIS).

Many 1968 and newer model vehicles are equipped with an air injection system which supplies air to the exhaust ports to extend the combustion process in the exhaust system. The system may be equipped with an external air pump. The pulse, aspirator, suction, or reed injection systems are not equipped with an air pump. Newer model vehicles may be equipped with an air pump which supplies air directly to the catalytic converter.