Posts Tagged: test knock sensor

What is a knock sensor — How It Works And Why It’s Used

Carmakers install a knock sensor to detect pre-ignition and detonation knock A knock sensor is built with a piezoelectric crystal inside that converts engine knock vibrations into an AC voltage. The greater the vibration, the higher the AC voltage and frequency. It’s usually bolted on the side of the engine block or in the valley of a V-style engine. Why detecting vibration is important Pre-ignition can damage pistons Engines can develop carbon buildup in the combustion chamber and that carbon can glow hot enough to ignite the air/fuel mixture before … Read More