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Home >> Pontiac >> 1993 >> Bonneville SE >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 3.8L "3800" V6 - VIN [L] >> Lubrication >> Testing Oil Pressure

Testing Oil Pressure

NOTE: If low pressure is suspected, the pressure can be checked on the vehicle.
  1. Check oil level. Raise vehicle and remove oil filter.
  2. Using J 25087 (Oil Pressure Test Kit), assemble plunger valve in the large hole of the tester base and the hose in the small hole of the test base. Connect gauge to the end of the hose.
  3. Insert the flat side of the rubber plug, for ease of installation, in the by-pass valve without depressing the by-pass valve itself. Install the tester on filter mounting pad.
  4. Start engine to check overall pressure, sender switch, or noisy lifters. Engine should be at operating temperature before checking oil pressure. Pressure should be approximately 414kPA (60 PSI) @ 1850 RPM using 10w30 engine oil.
  5. If adequate oil pressure is indicated, check pressure sending switch.
  6. If a low reading is indicated, depress the valve on tester base to isolate the oil pump and/or its components from the lubricating system. An adequate reading at this time would indicate a good pump and the previous low pressure was due to worn bearings etc. A low reading while depressing the valve would indicate a faulty pump.
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