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). SpecificationsMuffler > Repair procedures
Removal and Installation
1.
Remove the front muffler (B)
after disconnecting the oxygen sensor connector (A).
Tightening torque:39.2
~ 58.8 N.m (4.0 ~ 6.0 kgf.m, 28.9 ...
Removal
1.
Disconnect the battery negative
cable, and wait for at least three minutes before beginning work.
2.
Remove the front passenger seat
assembly.(Refer to the Body gr ...
Bright-Metal Maintenance
To remove road tar and insects, use a tar remover, not a scraper or other
sharp object.
To protect the surfaces of bright-metal parts from corrosion, apply a coating
of wax or chrome preser ...