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). SpecificationsFuel Filler Cap. Description and Operation
Description
A ratchet tightening device on the threaded fuel filler cap
reduces the chances of incorrect installation, which seals the fuel filler.
After the gasket on the fuel filler cap and t ...
Removal
1.
Remove the battery and the battery
tray. (Refer to "Charging system" in EE group.)
2.
Remove the under cover (A).
Tightening torque:7.8 ~
11 ...
Talking on the Phone
When talking on the phone, “Active Call” message and the other party’s phone
number (if available) are displayed on the audio.
• To Finish a Call
- Press button on the steering wheel.
...