OIL PRESSURE LIGHT MAY FLICKER AT IDLE IN HOT AMBIENT TEMP.

Models 1989 6000 AND GRAND PRIX Affected: MODELS WITH 2.8 and 3.1L

Pontiac: 1989 6000 and Grand Prix, 2.8L and 3.1L

Condition:

--------- The oil pressure light may flicker at idle, in very hot ambient temperatures. This condition may occur on 1989 6000 and Grand Prix models with 2.8L or 3.1L 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 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, giving a lower than actual reading, which may cause the warning light to flicker at idle.

Correction:

---------- A new vented 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 expected to be available on September 11, 1989. Until then normal part orders will not be accepted by GMSPO. Only verifiable VIP orders will be accepted. SPO will make every effort to obtain parts. All parts will be placed on 400 control to waive VIP surcharges. However, the part will be shipped premium transportation at dealer's expense. All other order types will be canceled as incorrectly ordered while the 400 control is in place.

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

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.