Instruments - Oil Pressure Light May Flicker At Idle

9224BUICK01

Bulletin 89-6-20

Date Sept. '89

Ref. No. 89-248-6

Corp. Ref. No. 938306


SUBJECT:
OIL PRESSURE LIGHT MAY FLICKER AT IDLE IN HOT MBIENT TEMPERATURES (REPLACE SENSOR)


MODELS AFFECTED:
1989 REGALS WITH 2.8L (VIN W) OR 3.lL (VIN T) ENGINES


CONDITION

The oil pressure light may flicker at idle, in very hot ambient temperatures. This condition may occur on 1989 Regals with 2.8L or 3.lL engines, with optional gage packages (these vehicles use both a gage and an oil pressure warning light).

CAUSE

The diaphragm, which moves with changes in oil pressure, may by affected by high ambient temperatures in the sensor, because the sensor is not vented. The high temperature causes the air inside the sensor to expand, pushing against the diaphragm, giving a lower than actual reading, which may cause the warning light to flicker at idle.

CORRECTION

A new vented [1][2]oil pressure sensor, part number 10096199, has been released for 1990 production. This new sensor should be used for the above applications for service.

Parts are currently available from GMSPO.

WARRANTY INFORMATION

Labor Operation Number: N2220, with applicable time
Trouble Code: 92