GM Cavalier/Sunbird/Skyhawk/Firenza 1982-1994

Knock Sensor (KS)

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OPERATION



See Figure 1

The Knock Sensor (KS) detects abnormal vibration (spark knocking) in the engine. The sensor is mounted in the engine block near the cylinders. The sensor produces an AC output voltage which increases with the severity of the knock. This signal voltage inputs to the ECM/PCM. The computer control module then adjusts the timing to reduce the knock. This allows the engine to use maximum spark advance to improve driveability and fuel economy.

REMOVAL & INSTALLATION



See Figure 2

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Detach the wiring harness connector from the Knock Sensor (KS).
  6.  
  7. Remove the knock sensor from the engine block.
  8.  

To install:
  1. Install the knock sensor into the engine block. Tighten to 12-16 ft. lbs. (16-22 Nm).
  2.  
  3. Attach the wiring harness connector to the sensor.
  4.  
  5. Carefully lower the vehicle.
  6.  
  7. Connect the negative battery cable.
  8.  



Click image to see an enlarged view

Fig. Fig. 1: View of the Knock Sensor (KS)



Click image to see an enlarged view

Fig. Fig. 2: The knock sensor can be found mounted to the engine block - 1992 3.1L engine shown

 
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