TrailBlazer 4WD L6-4.2L VIN S (2002)
Engine Oil Pressure: Testing and Inspection
Oil Pressure Diagnosis
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.
