Oil Pressure Gauge - Flutters/Reads Full Scale

91chevy26

GMC NUMBER: 91-6A-157

GROUP: 6A Engine Mechanical

DATE: November, 1991


CORPORATE NUMBER: 138304


SUBJECT: OIL PRESSURE GAGE FLUTTERS, OR MAY READ HIGH (REPLACE SENSOR)

MODELS: 1990-91 S/T, C/K, M/L, R/V/G/P


Some 1990 and 1991 light duty trucks with gages may experience an oil pressure gage that may flutter or show unusually high oil pressure (full scale).

Cause: The internal resistance wire in the sensor may not be properly supported, resulting in an intermittent open condition.

SERVICE PROCEDURE:
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 [1][2]oil pressure sensor with the correct new part number from the chart below.


PARTS INFORMATION:
New [1][2]Oil Pressure Sensor Part Numbers for the 1990-91 models are:


ENGINE MODEL ENGINE(S) ENGINE NEW P/N REPLACES
VIN CODES

S/T LN8/L38 A, E 10096178 1647135
LB4/LL2 Z, R 10096179 1647136
M/L All B, Z 10096178 1647135
C/K All Gas Z, H, K, N 10137652 10068563
Diesel C, J 10191433
R/V/P All Gas Z, H, K, N 10137652 10068563
Diesel C, J 10191433
G All Gas Z, H, K, N 10137652 10068563
Diesel 10191433

Parts are currently available from GMSPO.

WARRANTY INFORMATION:
Use existing labor operation N2220.