Allante V8-273 4.5L (1991)
Oil Pressure Gauge: Customer Interest
Oil Pressure Gauge - Erratic/Fluctuating Operation
Bulletin No.
T-91-105
File in Group
8
Number
139
Corp. Ref. No.
118303
Date
Aug. 1991
SUBJECT: OIL PRESSURE GAGE ERRATIC OR DISPLAYS HIGH OIL PRESSURE
MODELS AFFECTED: 1987-1992 ALLANTES
Some 1987-1992 Allantes before VIN breakpoint 135610 may experience a condition where the oil pressure gage may be erratic (needle fluctuates) or
display very high oil pressures. 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.
^
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.
^
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-82 of the Service
Information 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
the appropriate part number listed below.
Model Year
Carline
P/N
1987-1990
Allante
3532954
1991-1992
Allante
25605389
Some parts are currently available from GMSPO.
Other 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. 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 cancelled as incorrectly ordered while the 400 control is in
place.
WARRANTY INFORMATION
VEHICLE SERIES
Operation
Operation Description
Number
C
D
E
J
K
V
Engine Oil Pressure Switch - Replace
N2220
.2
