Exhaust Emissions System - Air Pump Air Injection System: Operation
Pressurized air from the air pump blows secondary air into engine exhaust ports to mix with hot gases being discharged from engine. This allows the mixture to reburn, greatly reducing HC and CO emissions. When excessive air pressure is present, some of the air pump output is released to the thermal reactor cooling jacket to prevent air pump damage and engine power loss. Air is drawn in through air cleaner, compressed by air pump, forced through air control valve and check valve, and fed into exhaust ports.