, is a device used to help control emissions in engines by pumping fresh air into the exhaust stream to allow the
to burn pollutants in the exhaust. This process is known as secondary air injection or air injection. When your air pump has failed, it
is necessary that you replace it immediately to ensure your vehicle and
Air pump and Air Injection Early Origins
This emissions control idea was devised in 1966. In 60s and 70s vehicles, there was a great deal of unburned fuel in the exhaust. Air injection was utilized as
the primary means of burning excess exhaust and reducing emissions. The early systems pumped air in either the exhaust ports of the cylinder head or in the
exhaust manifold.
Once the catalytic converter was created, the amount of unburned fuel in the exhaust was reduced even further. The role of air injection shifted away from the primary means
of emissions control and was used to make the catalytic converter more efficient. Now two injection points existed; the upstream and the downstream. While the engine is cold,
air is injected at the upstream point to clean the concentrated exhaust. It also increases the temperate of the exhaust in order to bring the catalytic converter to its efficient
operating temperature as soon as possible. When the engine is warm, air is injected at the downstream point in the catalytic converter. This helps oxidize the unburned fuel.
Air Pump Air Injection
Air injection systems use a vane pump which is powered from the engine with a belt. The air intake of the smog pump has an
air pump filter to remove particulates from the air. After the intake, the air is pumped under
pressure to the upstream and downstream injection points. To prevent exhaust from pushing its way back through the air injection system, a check value is integrated into the system.
With a carbureted engine, the amount of fuel in the exhaust has a tendency to increase drastically when the driver quickly lets off the throttle. To reduce the dangerous effects
of an increase of fuel in the exhaust, a diverter value senses the sudden increase by the quick closure of the throttle. The value then diverts the air pump’s outlet to the engine
air cleaner or to a silencer to reduce unwanted noise.
Smog Pump & Air Pump Parts
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