GM Astro/Safari 1985-1996 Repair Guide

Oil Pressure Sender

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OPERATION

The oil pressure sender relays to the dash gauge the oil pressure in the engine.

TESTING



  1. Check the oil level and correct as necessary. Turn the ignition switch on, but do not start the engine.
  2.  
  3. Disconnect the sensor lead at the sensor. The gauge should read full scale.
  4.  
  5. Ground the connector. The gauge should read at the bottom of the scale.
  6.  
  7. At 0 psi (0 kPa) the resistance of the sensor should be 1 ohm.
  8.  
  9. At 40 psi (275 kPa) the resistance of the sensor should be 44 ohms.
  10.  

REMOVAL & INSTALLATION



See Figures 1, 2, 3 and 4



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Fig. Fig. 1: The oil pressure sender can be reached after removing the engine cover



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Fig. Fig. 2: Do not put too much sideways force on the sender or you can damage the adapter



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Fig. Fig. 3: You can use some pipe sealer to make sure oil doesn't leak past the sender threads



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Fig. Fig. 4: Do not crossthread the sender into the adapter or you will definitely have a leak to contend with

  1. Disconnect the negative battery cable. Remove the engine cover.
  2.  
  3. Disconnect the sensor electrical lead and unscrew the sensor. The sensor can be found on the top side of the engine, near the distributor.
  4.  

To install:
  1. Coat the first 2 or 3 threads with sealer. Install the sensor and tighten until snug. Engage the electrical lead.
  2.  
  3. Connect the battery cable and install the engine cover.
  4.  

 
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