Seller notes

Our Knock Sensor has a piece of piezoelectric ceramic inside. When you purchase an knock sensor, always ask seller if the piezoelectric ceramic is included. The piezoelectric ceramic acts as an amplifier. When the Knock happens, it will warn the ECU (Engine Control Unit). The ECU will then delay the ignition timing. Without this piezoelectric ceramic, The ECU has noway to know the "knock" has happened. It keeps on advancing the ignition timing. which will cause the temperature to be increased. I...

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