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). SpecificationsWindshield Wiper Blade Replacement
When the wipers no longer clean adequately, the blades may be worn or cracked,
and require replacement.
✽ NOTICE
To prevent damage to the wiper blades, do not use gasoline, kerosene, paint ...
Preparation Of Tools And Measuring Equipment
Be sure that all necessary tools and measuring equipment are available starting
work. ...
Replacement
1.
Remove the front wheel & tire.
Tightening torque:88.3
~ 107.9N.m(9.0 ~ 11.0kgf.m, 65.1 ~ 79.6lb-ft)
...