Air Injection System: Description

The Fiesta air injection system is designed to reduce unburned hydrocarbon (HC) and carbon monoxide (CO) emissions. It does this by injecting fresh air into the exhaust ports to further the burning of hot exhaust gases. The air, which is pressurized by the air pump, enters the exhaust port either through an external supply tube or through internally-drilled passages. The system consists of an air pump, a bypass valve, a vacuum vent valve, exhaust check valve, idle vacuum valve, and vacuum delay valve.