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Home >> Cadillac >> 2009 >> Escalade EXT >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 4.8L, 5.3L, 6.0L Or 6.2L (1 Of 5) >> Diagnostic Information and Procedures >> Oil Pressure Diagnosis and Testing

Oil Pressure Diagnosis and Testing

Tools Required

    Fig 1: View Of Special Tools Oil Pressure Gage & Adapter
    GM1658100Courtesy 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 antifreeze

      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 EN-47971  (1). See Special Tools .
  7. Install the J 21867  (2), or equivalent to the EN-47971  (1). See Special Tools .
  8. Run the engine and measure the engine oil pressure.
  9. Compare the readings to Engine Mechanical Specifications (RPO LY2 VIN C)  or Engine Mechanical Specifications (RPO LMG VIN 0)  or Engine Mechanical Specifications (RPO LY5 VIN J)  or Engine Mechanical Specifications (RPO LC9 VIN 3)  or Engine Mechanical Specifications (RPO L76 VIN Y)  or Engine Mechanical Specifications (RPO LY6 VIN K)  or Engine Mechanical Specifications (RPO L9H) .
  10. If the engine oil pressure is below specifications, inspect the engine for 1 or more of the following conditions:
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