New Generation N62 Engine Chapter 3 P.17
Course Contents/Background Material
© BMW AG, Service Training
- Secondary air system
General information
Fig. 15: N62 air routing
Blowing additional air (secondary air) into the cylinder head
exhaust duct during the warm-up phase results in a thermal
secondary combustion which in turns results in a reduction of
the non-combusted hydrocarbons (HC) and carbon monoxide
(CO) contained in the exhaust vapours.
The energy generated during this process heats up the catalytic
converter faster during the warm-up phase, and increases its
conversion rate.
Index Description
1 Air intake duct
2 Air cleaner housing with intake air silencer
3 Intake pipe with HFM (hot-film air-mass flow sensor)
4 Secondary air valves
5 Secondary air pump
KT-7888
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