Kia Optima: Description and Operation - Exhaust Emission Control 
		System - Emission Control System - Kia Optima TF 2011-2019 Service ManualKia Optima: Description and Operation


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.

1. Open Loop air/fuel ratio is controlled by information pre-programmed into the ECM.
2. Closed Loop air/fuel ratio is constantly adjusted by the ECM based on information supplied by the oxygen sensor.

Exhaust Emission Control System

Catalytic Converter. Description and Operation
Description The catalytic converter of the gasoline engine is a three way catalyst. It oxidizes carbon monoxide and hydrocarbons (HC), and separates oxygen from the oxides of nitrogen (NOx). ...

See also:

- Make sure that the IMS control switch connectors and related connectors are plugged in properly. ...

To Resume the Preset Speed
The vehicle will automatically resume the speed set prior to cancellation when you press and release the RES/ACCEL switch, providing the vehicle speed is above 25 mph (40 km/h). ...

1. Front bracket 2. Stop ring 3. Stopper 4. Overrun clutch assembly 5. Internal gear assembly 6. Lever 7. Lever stop 8. Magnet switch assembly 9. Driv ...

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