Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Description And Operation: Description
- Knocking is a phenomenon characterized by undesirable vibration and noise and can cause engine damage.
- Knock Sensor (KS) is installed on the cylinder block and senses engine knocking.
- When knocking occurs, the vibration from the cylinder block is applied as pressure to the piezoelectric element.
At this time, this sensor transfers the voltage signal higher than the specified value to the ECM and the ECM retards the ignition timing.
- 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.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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