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Home >> Buick >> 2004 >> Rainier 5.3 P, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Control System - 4.2L (Introduction)) >> Description and Operation >> Knock Sensor (KS) System Description >> Purpose
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Knock Sensor (KS) System Description: Purpose

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The knock sensor (KS) system enables the control module to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The control module uses the KS system to test for abnormal engine noise that may indicate detonation, also known as spark knock.