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Home >> Volvo >> 2002 >> S40 >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Ignition Systems >> Ignition Timing Control >> Knock Sensor
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Knock Sensor

Knock sensor is fitted to cylinder block to sense detonation inside cylinders. When detonation is detected, ECM retards ignition timing in each cylinder individually until knocking stops.