OIL PRESSURE GAGE ERRATIC (REPLACE OIL PRESS. SENSOR)

SUBJECT: OIL PRESSURE GAGE ERRATIC OR DISPLAYS HIGH OIL PRESSURE (REPLACE OIL PRESSURE SENSOR)

MODELS AFFECTED: 1986-90 RIVIERA 1988-90 REATTA

Some 1986-90 Rivieras and 1988-90 Reattas may experience a condition where the oil pressure gage may be erratic (needle fluctuates) or display very high oil pressure. This is due to an internal intermittent contact within the oil pressure sensor.

To diagnose oil pressure gage complaints check the oil pressure with a mechanical gage using the oil pressure sensor hole in the engine block.

o If the oil pressure is incorrect according to the engine specifications in Section 6, refer to Section 6 for diagnosis of high or erratic oil pressure.

o If the oil pressure is correct according to the engine specifications in Section 6 of the Service Information Manual, enter service diagnostics and monitor BCM data parameter BD71. BD71 is oil pressure in psi.

- If the parameter value is not erratic or a maximum value and the instrument panel cluster gage is, refer to Section 8A of the Service Manual for diagnosis of display conditions.

- If the parameter value is erratic or at a maximum value and agrees with instrument panel cluster gage, replace the oil pressure sensor with part number 3532954.

Parts are expected to be available on August 19, 1991. Until then, normal part orders will not be accepted by GMSPO. Only verifiable emergency VIP orders will be accepted. GMSPO 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 cancelled as incorrectly ordered while the 400 control is in place.

WARRANTY INFORMATION:

Labor Operation Number: N2220 Engine Oil Pressure Switch - Replace Labor Time: .3 hr.

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.