Kia Optima: [CVVT System Mode] - CVVT (Continuously Variable Valve Timing) System. Description 
		and Operation - Exhaust Emission Control 
		System - Emission Control System - Kia Optima TF 2011-2019 Service ManualKia Optima: [CVVT System Mode]

(1) Low Speed / Low Load
(2) Part Load


(3) Low Speed / High Load
(4) High Speed / High Load



Driving
Condition
Exhaust Valve
Intake Valve
Valve
Timing
Effect
Valve
Timing
Effect
(1) Low Speed
/Low Load
Completely
Advance
* Valve Under-lap
* Improvement of combustion stability
Completely
Retard
* Valve Under-lap
* Improvement of combustion stability
(2) Part Load
Retard
* Increase of expansion work
* Reduction of pumping loss
* Reduction of HC
Retard
* Reduction of pumping loss
(3) Low Speed
/High Load
Retard
* Increase of expansion work
Advance
* Prevention of intake back flow (Improvement of volumetric efficiency)
(4) High Speed
/High Load
Advance
* Reduction of pumping loss
Retard
* Improvement of volumetric efficiency
Operation Principle
The CVVT has the mechanism rotating the rotor vane with hydraulic force generated by the engine oil supplied to the advance or retard chamber in accordance with the CVVT oil control valve contro ...

Engine Control/Fuel System
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See also:

Engine Temperature Gauge
This gauge shows the temperature of the engine coolant when the ignition switch is ON. If the gauge pointer moves beyond the normal range area toward the H position, it indicates overheating that ...

Components and Components Location
Components 1. HECU module 2. Front wheel speed sensor 3. Rear wheel speed sensor 4. Yaw rate & Lateral G sensor 5. Steering angle sensor 6. ABS Warning lamp ...

Schematic Diagrams
Schematic Diagram CanisterThe Canister is filled with charcoal and absorbs evaporated fuel vapor from the fuel tank. The gathered fuel vapor in canister is drawn into the intake manifold b ...

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