Air Injection System: Description

The air management system consists of the following sub-systems: Air Injection, Secondary Air Control, Air Induction and By-Pass Air Control. The air injection system controls CO, HC and NOx emissions by injecting secondary air into the exhaust system to cause further burning of exhaust gases. System consists of an air pump, 2 check valves, an air control valve, relief solenoid valve, switching solenoid valve, heat hazard sensor and catalytic converters.

Air is drawn from the clean side of the air cleaner by the air pump and directed to the air control valve under pressure. From the air control valve, secondary air is directed (by the switching solenoid valve) "downstream" to the pellet converter or "upstream" to the exhaust port.

The air induction system brings air into the engine for combustion functions. The system consists of an air cleaner, airflow meter, air funnel, throttle chamber, dynamic chamber and intake manifold.

The secondary air control system contains 2 check valves to prevent exhaust gas from leaking back into the air pump. The switching solenoid valve directs secondary air through the air control valve "downstream" and/or "upstream", based upon engine temperature, manifold vacuum and engine speed.

The By-Pass Air Control System (BAC) controls the amount of by-pass air to maintain idling speed. System is controlled by a air by-pass solenoid valve, relief solenoid valve, split air solenoid valve and port air solenoid valve.