| VERACRUZ(EN) >2013 > G 3.8 DOHC > Emission Control System > Exhaust Emission Control System>Description and Operation |
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Exhaust emissions (CO,
HC, NOx) are controlled by a combination of engine modifications and the
addition of special control components.
Modifications to the
combustion chamber, intake manifold, camshaft and ignition system form the
basic control system.
These items have been
integrated into a highly effective system which controls exhaust emissions
while maintaining good drivability and fuel economy.
Air/Fuel
Mixture Control System [Multiport Fuel Injection (MFI) System]
The MFI system uses
signals from the heated oxygen sensor to activate and control the injector
installed in the manifold for each cylinder, thus precisely regulating the
air/fuel mixture ratio and reducing emissions.
This in turn allows
the engine to produce exhaust gas of the proper composition to permit the
use of a three way catalyst. The three way catalyst is designed to convert
the three pollutants [hydrocarbons (HC), carbon monoxide (CO), and oxides
of nitrogen (NOx)] into harmless substances. There are two operating modes
in the MFI system.
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