Instruments - Oil Pressure Light May Flicker At Idle

9218chevy02

Number: 89-254-SC

Section: 8C

Date: September 1989

Corporate Bulletin No.: 938306


Subject:
OIL PRESSURE LIGHT MAY FLICKER AT IDLE IN HOT AMBIENT


Model and Year:
1988-89 A, J, L CARS WITH 2.8L ENGINES


TO: ALL CHEVROLET DEALERS

The oil pressure light may flicker at idle in very hot ambient temperatures. This condition may occur on 1988 J and L cars, and on 1989 A. J, and L cars with 2.8L engines, with optional gage packages (these vehicles use both a gage and an oil pressure warning light).

The diaphragm, which moves with changes in oil pressure, may be 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, givng a lower than actual reading, which may cause the warning light to flicker at idle.

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 from GMSPO.

Warranty Information:
Use Labor Operation N2220, with applicable time.