Bonneville V6-231 3.8L (1984)
Oil Pressure Warning Lamp/Indicator: Technical Service Bulletins
Engine - Intermittent Oil Light, Collapsed Valve Lifters
Number 85-6(Gasoline)-20
Date 4/85
Subject:
INTERMITTENT OIL LIGHT OR COLLAPSED VALVE LIFTERS
1984-85 MODELS WITH 3.0L & 3.8L V-6 ENGINES
Some vehicles may experience an intermittent oil light, usually when engine is first started, or a collapsed lifter condition where the cause was not
determined.
These conditions may result from intermittent low oil pressure which may be due to the oil pump pressure regulator plug sticking in the bore.
If this condition is encountered, inspect the pressure regulator plug for free movement the full bore travel. Assure valve freeness and clean as necessary.
On 1984-85 3.8L and 1984 3.0L engine the plug is a relief valve located in the oil pump cover.
On 1985 3.0L (VIN Code L) engines the pressure regulator plug is located in the front cover behind the oil filter adapter.
