INCORRECT/ERRATIC OIL PRESSURE READINGS INST OIL PRESS SENSOR

SUBJECT INCORRECT OR ERRATIC OIL PRESSURE READINGS - INSTALL NEW OIL PRESSURE SENSOR

MODELS/YEARS 1991-93 BRAVADA W/4.3L (VIN W, Z) ENGINE

CONDITION: Owners of some 1991-93 Bravadas may comment that the oil pressure dash gage reads high, has erratic movement or is inoperative.

CAUSE: The intemal resistance wire in the oil pressure sensor may not be properly supported, resulting in an intermittent open condition.

CORRECTION: Check for normal causes of high oil pressure gage readings (high resistance or open circuit), such as a poor ground path caused by loose sensor mounting, oil cooler adapter loose, or poor electrical connections. If no cause can be found, replace the oil pressure sensor following the procedure below.

1. Disconnect the negative battery cable.

2. Remove the wiring harness connector from the oil pressure sensor.

3. Remove the oil pressure sensor.

4. Install the new oil pressure sensor. The following parts are currently available form GMSPO:

Engine VIN Code W - P/N 10201490 Engine VIN Code Z - P/N 10201491

5. Connect the wiring harness connector to the oil pressure sensor.

6. connect the negative battery cable.

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.