Exhaust Emissions System - Air Pump Air Injection System: Description

NOTE: For 1974-78 models, see AIR INJECTION SYSTEMS article In this section. All other 1979 models use a reed valve type air Injection system. See MAZDA REED VALVE AIR INJECTION article In this section.

The air pump type air injection system injects additional air into the exhaust manifold to assist in burning of HC and CO emissions passing through the crankcase. On GLC models, the air injection system assists the 3-way catalytic converter in oxidizing NOx, HC and CO pollutants.

System consists of belt-driven air pump (with built-in relief valve), air control valve, air by-pass valve (B2000 only), check valve and air injection nozzles. See Figure.