Table of Contents
Advertisement
Emission Controls (cont'd)
Intake Air Temperature Control System (2.0 S)
The air control valve mounted inside the air cleaner snorkel
automatically opens and closes according to the intake air
temperature. The carburetor then receives air of constant
temperature which results in lower exhaust emissions.
Carburetor Controls
—Throttle controller — This system controls the throttle during
gear shifting, reducing the amount of HC caused by unburned
fuel mixture.
— Choke opener — When starting a cold engine, this device
opens the choke slightly. This reduces the amount of HC and
CO.
— Altitude Compensation devices — The Air Jet Controller (AJC)
has an atmospheric pressure sensing bellows. The AJC is
designed to control the amount of additional air fed to the
carburetor jets to maintain good driveability at any altitude.
Ignition Timing Control System
This system automatically controls the ignition timing to reduce
the amount of HC and NOx.
Exhaust Gas Recirculation (EGR)
[Except California 2.0 S models]
The EGR system is designed to control the formation of oxides of
nitrogen (NOx) caused when fuel mixture burns at high
temperature. It works by recirculating exhaust gas through the
EGR valve and intake manifold into the combustion chambers
where it reduces peak temperature by diluting the air/fuel mixture.
Catalytic Converter
The catalyst is used to convert hydrocarbons (HC), carbon
monoxide (CO) and oxides of nitrogen (NOx) in the exhaust gas,
to carbon dioxide (CO
(2.0 S)
), dinitrogen (N
) and water vapor.
2
2
Hide quick links:
Advertisement
Table of Contents
