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Home >> Pontiac >> 2005 >> Grand Prix GXP >> Repair and Diagnosis >> Engine Mechanical >> Engine Mechanical - 5.3L >> Diagnostic Information and Procedures >> Oil Pressure Diagnosis and Testing

Oil Pressure Diagnosis and Testing

Tools Required

    Fig 1: View Of J 21867 & J 42907
    GM825822Courtesy of GENERAL MOTORS CORP.
  1. With the vehicle on a level surface, run the vehicle for a few minutes, allow adequate drain down time, 2-3 minutes, and measure the oil level.
  2. If required, add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator.
  3. Run the engine briefly, 10-15 seconds, and verify low or no oil pressure on the vehicle gage or light.
  4. Listen for a noisy valve train or a knocking noise.
  5. Inspect for the following conditions:
    • Oil diluted by water or glycol anti freeze

      Refer to Coolant in Engine Oil .

    • Foamy oil, which may be caused by a cut or damaged oil pump screen O-ring seal
  6. Remove the oil filter and install the J 42907  . See Special Tools .
  7. Install J 21867  or equivalent to the J 42907  . See Special Tools .
  8. Run the engine and measure the engine oil pressure.
  9. Compare the readings to Engine Mechanical Specifications .
  10. If the engine oil pressure is below specifications, inspect the engine for one or more of the following conditions:
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