GM Buick/Oldsmobile/Pontiac/Full-Size 1975-1990 Repair Guide

Sending Units and Sensors

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REMOVAL & INSTALLATION



See Figures 1 and 3

Coolant Temperature
  1. Disconnect the negative battery cable.
  2.  
  3. Drain the coolant to a level below the coolant temperature sensor or sending unit.
  4.  
  5. Disconnect the electrical connection.
  6.  
  7. Remove the sensor or sending unit from the engine.
  8.  
  9. Installation is the reverse of removal. Torque to 23 ft. lbs (32 Nm).
  10.  



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Fig. Fig. 1: Common sensor locations on V6 engines

Oil Pressure
  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the electrical connector.
  4.  
  5. Remove the sending unit from the engine.
  6.  
  7. Installation is the reverse of removal. Torque to 23 ft. lbs (32 Nm).
  8.  

See Figure 2



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Fig. Fig. 2: Common sensor locations on V8 gasoline engines

Knock Sensor
  1. Disconnect the negative battery cable.
  2.  
  3. On some vehicles, it may be necessary to raise the car to access the sensor. Be sure to properly secure it.
  4.  
  5. Disconnect the electrical connector from the sensor.
  6.  
  7. Remove the sensor from the engine.
  8.  
  9. Installation is the reverse of removal. Apply a thread sealer, such as a soft sealing tape, to the ESC sensor threads. Torque to 23 ft. lbs (32 Nm).
  10.  



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Fig. Fig. 3: Sensor locations on diesel engines

Oxygen Sensor

The oxygen sensor may be difficult to remove when the engine temperature is below 120°F (48°C). Excessive force may damage the threads in the exhaust manifold or pipe. Care must be taken during removal.

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the electrical connector.
  4.  
  5. Carefully remove the oxygen sensor using a special sensor removal tool.
  6.  

To install:
  1. Coat the threads of the sensor with a special oxygen sensor anti-seize compound. Do not use a anti-seize compound not made for oxygen sensors.
  2.  
  3. Install the sensor and torque to 30 Ft. lbs (41 Nm).
  4.  
  5. Connect the electrical connector and negative battery cable.
  6.  

 
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