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2002 GMC Sierra 1500
Question: WHATS IS THE KNOCK SENSOR WHATS IT DO HOW TO DO ITREPLACED MASS AIR
Answer #1patrick mannion from Greg Solow's Engine Room, January 16, 2011, 21:51Master
The knock sensor is on the engine block it picks up detonation and retards the ignition timing when it senses detonation to save the engine from damage. It may be the sensor or a damaged wiring harness.
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