Grand Prix V6-3.8L (2007)
6. Start the engine and check the overall oil pressure, the oil pressure switch, and for noisy lifters. The engine should be at operating temperature
before checking the oil pressure. The oil pressure should be approximately 414 kPa (60 psi) at 1850 RPM using 10W30 engine oil.
7. If adequate oil pressure is indicated, check the oil pressure switch.
8. If a low reading is indicated, press the valve on the tester base to isolate the oil pump and/or its components from the lubricating system. An
adequate reading at this time indicates a good pump and the previous low pressure was due to worn bearings, etc. A low reading while pressing the
valve would indicate a faulty pump.
