The secondary air system | Part 1: Design, function, components

How does the secondary air system work?
What components is it made up of?
What is secondary air?
What does the secondary air pump do?
What is the function of the secondary air valve?
In this video you can find out what makes up the secondary air system and how it works.

00:00 Cold start and emissions
01:00 Design and function of the secondary air system
01:41 Secondary air pump and secondary air valve
02:21 Emission control

With spark-ignition engines, the greatest pollution occurs on cold starting. Secondary-air systems have been successfully employed to reduce such cold starting emissions.

A “rich mixture”, i.e. a mixture with excess fuel, is required for starting a cold spark-ignition engine.
Until the catalytic converter reaches operating temperature and Lambda control action starts to take effect, large quantities of carbon monoxide and unburnt hydrocarbons are produced.
To reduce the level of these pollutants, ambient air with a high oxygen content (“secondary-air”) is injected into the exhaust manifold directly downstream of the exhaust valves during the cold starting phase. This results in post-oxidation (“afterburning”) of the pollutants to form carbon dioxide and water.
The heat generated in this process additionally warms the catalytic converter and speeds up the onset of Lambda control action.

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Further technical information for you:

Service information:
mam.kspg.com/mc/epaper?guid=14c1145d17ae932c


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