Malibu, Malibu MAXX 2006-2008

Oil Pressure Sensor

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Removal & Installation



2.2L Engine
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Raise and support the vehicle.
  6.  
  7. Disconnect the engine oil pressure sensor electrical connector.
  8.  
  9. Remove the engine oil pressure sensor.

    Click image to see an enlarged view

    Fig. The removal and installation of the oil pressure sensor

  10.  

To install:

  1. Install the engine oil pressure sensor, and tighten the oil pressure switch to 16 ft. lbs. (22 Nm).
  2.  
  3. Connect the engine oil pressure sensor electrical connector.
  4.  
  5. Lower the vehicle.
  6.  
  7. Connect the negative battery cable.
  8.  

3.5L Engine
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the battery negative cable from the battery.
  4.  
  5. Remove the oil pressure sensor heat shield bolts and shield if required.
  6.  
  7. Remove the electrical connector from the engine oil pressure sensor.
  8.  
  9. Remove the engine oil pressure switch.

    Click image to see an enlarged view

    Fig. The removal and installation of the oil pressure sensor

  10.  

To install:

  1. Install the engine oil pressure switch, and tighten the switch to 12 ft. lbs. (16 Nm).
  2.  
  3. Install the electrical connector to the engine oil pressure switch.
  4.  
  5. Install the oil pressure sensor heat shield bolts and shield if required. Tighten bolts to 89 inch. lbs. (10 Nm).
  6.  
  7. Connect the battery negative cable to the battery.
  8.  

3.9L Engine
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the battery negative cable from the battery.
  4.  
  5. Remove the oil pressure sensor heat shield bolts and shield if required.
  6.  
  7. Remove the electrical connector from the engine oil pressure sensor.
  8.  
  9. Remove the engine oil pressure switch.

    Click image to see an enlarged view

    Fig. 3.9L Oil pressure sensor removal

  10.  

To install:

  1. Install the engine oil pressure switch, and tighten the switch to 12 ft. lbs. (16 Nm).
  2.  
  3. Install the electrical connector to the engine oil pressure switch.
  4.  
  5. Install the oil pressure sensor heat shield bolts and shield if required. Tighten bolts to 89 inch. lbs. (10 Nm).
  6.  
  7. Connect the battery negative cable to the battery.
  8.  

Testing



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. With the vehicle on a level surface, allow adequate drain down time of 2-3 minutes and measure for a low oil level. Add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator.
  4.  
  5. Run the engine, and verify low, or no oil pressure on the vehicle gage or light.
  6.  
  7. Listen for a noisy valve train or a knocking noise.
  8.  
  9. Inspect for the following:

    Oil diluted by moisture or unburned fuel mixtures
     
    Improper oil viscosity for the expected temperature
     
    Incorrect or malfunctioning oil pressure sender
     
    Incorrect or malfunctioning oil pressure gage
     
    Plugged oil filter
     
    Malfunctioning oil bypass valve
     

  10.  
  11. Remove the oil pressure sender or another engine block oil gallery plug.
  12.  
  13. Install special tool J21867-850 and an oil pressure gage and measure the engine oil pressure.
  14.  
  15. Compare the readings to specifications.
  16.  
  17. If the engine oil pressure is below specifications, inspect the engine for one or more of the following:

    Oil pump worn or dirty
     
    Oil pump-to-engine front cover bolts loose
     
    Oil pump screen loose, plugged, or damaged
     
    Oil pump screen O-ring seal missing or damaged
     
    Malfunctioning oil pump pressure regulator valve
     
    Excessive bearing clearance
     
    Cracked, porous or restricted oil galleries
     
    Oil gallery plugs missing or incorrectly installed
     
    Broken lash adjusters
     

  18.  

 
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