Jeeper  Adventures Under the Hood  Jeeper

Knock Sensor


The Knock Sensor is located in the intake manifold just forward of the carburetor, buried under hoses and wires. It's really nothing more than a microphone, tuned to a narrow band around 5 KHz.When knocking, pinging, detonation, or whatever you like to call it occurs, the sensor picks up the characteristic sound and feeds it to the computer, which retards the timing in an attempt to stop it.

You can observe this by knocking on the intake manifold next to the sensor while watching the timing mark with a timing light.

Knock Sensor
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