Air Pump/Smog Pump, also commonly referred to as a Smog Pump, is an emissions component that is part of the, secondary air injection system. It is responsible for pumping clean air into the vehicle’s exhaust stream, to promote a cleaner and more complete burn, before the fumes exit the tailpipe.
Emission Control Systems
Air Pump – Secondary Air Injection – Function, Types, Failure
The air pump – secondary air injection system (AIS), is actually a part of the exhaust system. Since no internal combustion engine is 100% efficient, there will always be some unburned fuel in the exhaust. […]