Air Injection Systems: Description

A manifold air injection system is used to reduce hydrocarbon (HC) and carbon monoxide (CO). The system adds a controlled amount of air to exhaust gases at the exhaust ports, causing oxidation of gases. On some models, air injection is used in conjunction with a catalytic converter or thermal reactor. The air injection system consists of a belt driven air pump, connecting hoses, check valve(s), and an anti-backfire suppressor valve (either on anti-backfire or diverter valve). Some models will incorporate other unique control devices which are discussed at the end of this article.