![Kia Optima: [CVVT System Mode] - CVVT (Continuously Variable Valve Timing) System. Description
and Operation - Exhaust Emission Control
System - Emission Control System - Kia Optima TF 2011-2024 Service Manual](images/pages/small/3.png)
Kia Optima: [CVVT System Mode]
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(1) Low Speed / Low Load |
(2) Part Load |
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(3) Low Speed / High Load |
(4) High Speed / High Load |
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Driving Condition |
Exhaust Valve |
Intake Valve |
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Valve Timing |
Effect |
Valve Timing |
Effect |
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(1) Low Speed /Low Load |
Completely Advance |
* Valve Under-lap * Improvement of combustion stability |
Completely Retard |
* Valve Under-lap * Improvement of combustion stability |
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(2) Part Load |
Retard |
* Increase of expansion work * Reduction of pumping loss * Reduction of HC |
Retard |
* Reduction of pumping loss |
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(3) Low Speed /High Load |
Retard |
* Increase of expansion work |
Advance |
* Prevention of intake back flow (Improvement of volumetric
efficiency) |
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(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
h4 {color:#800000}
h3 {color:#0033CC}
h2 {color:#008000}
h1 {color:#FF0000}
...
See also:
Don't let ice and snow accumulate
underneath
Under some conditions, snow and ice
can build up under the fenders and interfere
with the steering. When driving in
severe winter conditions where this may
happen, you should periodically chec ...
MAX A/C MODE
When you select the MAX A/C mode (switch indicator illuminates) while the fan
speed is on, it will be set the system automatically as follows;
- the air conditioning system will be turned on.
- ...
Inspection
1.
Insert a thin stick (A) into the PCV valve (B) from
the threaded side to check that there is the plunger movement.
...
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