Firebird V6-3.8L VIN K (1995)
Knock Sensor: Description and Operation
Knock Sensor
DESCRIPTION
Varying octane levels in today's gasoline may cause detonation in some engines. Detonation is caused by an uncontrolled explosion (burn) in the
combustion chamber. This uncontrolled explosion could produce a flame front opposite that of the normal flame front produced by the spark plug.
The "rattling" sound normally associated with detonation is the result of two or more opposing pressures (flame fronts) colliding within the
combustion chamber. Though "light" detonation is sometimes considered normal, "heavy" detonation could result in engine damage.
To control spark knock, a Knock Sensor (KS) system is used. This system is designed to retard spark timing up to 15 degrees to reduce spark
knock in the engine. This allows the engine to use maximum spark advance to improve driveability and fuel economy.
