LaCrosse V6-3.8L VIN 2 (2005)
Engine Oil Pressure: Testing and Inspection
Oil Pressure Diagnosis and Testing
Low or No Oil Pressure
The following can cause low or no oil pressure:
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Low oil level - fill to the full mark on the oil level indicator.
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Slow idle speed
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Incorrect or malfunctioning oil pressure switch - replace the oil pressure switch.
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Incorrect or malfunctioning oil pressure gage - replace the oil pressure gage.
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Improper oil viscosity or diluted oil
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Install oil of proper viscosity for expected temperature.
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Install new oil if it is diluted.
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The oil pump is worn or dirty - clean or replace the oil pump.
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The oil filter is plugged - replace the oil filter.
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The oil pickup screen is loose or plugged - replace the oil pickup screen.
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A hole in the oil pickup tube - replace the oil pickup tube.
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Excessive bearing clearance - replace the bearings.
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Cracked, porous, or plugged oil galleries - repair or replace the engine block.
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The gallery plugs are missing or improperly installed - install or repair as necessary.
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The pressure regulator valve is stuck.
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Check the pressure regulator valve for sticking in the bore.
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Check the bore for scoring and burrs.
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The camshaft is worn or poorly machined - replace the camshaft.
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Worn valve guides - repair as needed.
Oil Pressure Testing
Tools Required
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J25087-C Oil Pressure Tester
If the vehicle has low oil pressure perform the following tests.
1. Check the oil level.
2. Raise the vehicle and remove the oil filter.
3. Assemble the plunger valve in the large hole of J25087-C base and the hose in the small hole of J25087-C base. Connect the gage to the end of the
hose.
4. Insert the flat side of the rubber plug in the bypass valve without depressing the bypass valve itself.
5. Install J25087-C on the filter mounting pad.
