Skylark V6-173 2.8L VIN X 2-bbl (1984)
Knock Sensor: Description and Operation
NOTE: Check underhood label, or Application Charts for vehicle emission control equipment.
ESC--used in conjunction with Electronic Spark Timing (EST)--reduces spark advance during periods of detonation.
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"Knock" or "Detonation" sensor--mounted in the engine block or intake manifold--signals the ESC controller when detonation occurs.
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ESC Controller signals the ECM which reduces spark advance.
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When detonation ceases and the ESC controller is no longer receiving knock signals, spark control reverts back to EST.
