Measuring Procedure

Install EN-498-B gauge (1) along with EN-498-3 adapter (2).

Fig 1: Gauge And Adapter
Courtesy of GENERAL MOTORS COMPANY
Start Engine.
Measure the oil pressure:
NOTE: The oil temperature should be between 80°C (176°F) and 100°C (212°).
- The oil pressure at idle speed should be 150 kpa (22 psi).
- The oil pressure between 3000 - 3500 rpm should be 380 - 650 kpa (55 - 94 psi).
Stop engine.
If the engine oil pressure is below specifications, inspect the engine for 1 or more of the following conditions:
- Oil pump worn or dirty. Refer to Oil Pump Replacement and Engine Front Cover and Oil Pump Cleaning and Inspection .
- Oil suction gallery clogged or dirty. Refer to Oil Pan Cleaning and Inspection
- Cracked, porous or restricted oil galleries.
- Oil pressure relief valve malfunction.
Remove EN-498-B gauge and EN-498-3 adapter.