Air Injection Systems: Description

The air injection systems, used on many applications, are designed to reduce carbon monoxide and hydrocarbon emissions. This is done by injecting fresh air into the exhaust manifold to continue the burning process of gases which pass through the combustion cycle. The air injection system consists of an air pump with integral filter, diverter/by-pass valve, check valve(s), external or internal injection tubing and connecting hoses.

Some late 1977 Ford models use a pulse air type system. This system does not use a belt driven pump. General Motors models with 250" 6-cylinder engines use a Pulse Air Injection Reactor (PAIR) type air injection system (no air pump). This system uses check valves and connecting pipes to inject air.