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How do you test a knock sensor to see if it is bad?

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Wiki User
2008-03-01 18:54:24

Knock sensors detect detonation ( knocking ) by reacting to the

ping by retarding the ignition timing so you will need a timing

light for this. connect the timing light and locate the knock

sensor, ( many are on the intake manifold ) now use a metal object

to tap ( not too hard and not on the sensor itself ) on the intake

manifold ( light tapping should suffice ), if the sensor is

functioning you will see the timing retard. If the timing does not

retard you will need to check voltage across the terminals of the

knock sensor connector.

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