Kia Optima: Knock Sensor (KS). Description and OperationWhen knocking occurs, the vibration from the cylinder block is applied as pressure to the piezoelectric element. When a knock occurs, the sensor produces voltage signal. The ECM retards the ignition timing when knocking occurs. If the knocking disappears after retarding the ignition timing, the ECM will advance the ignition timing. This sequential control can improve engine power, torque and fuel economy.

Installation
Knock Sensor (KS). SpecificationsTowing service
If emergency towing is necessary, we
recommend having it done by an authorized
Kia dealer or a commercial tow-truck
service. Proper lifting and towing procedures
are necessary to prevent d ...
Owner Maintenance Schedule
The owner or a qualified service technician should perform these vehicle inspections
at the indicated intervals to ensure safe and dependable operation.
Bring any problem to the attention of an aut ...
To Reset at a Faster Speed
1. Push the RES/ACCEL switch and hold it.
2. Accelerate to desired speed and release the RES/ACCEL switch. While the switch
is pressed, the vehicle will gradually gain speed. ...