C 3500 Truck 2WD V8-454 7.4L (1990)
Oil Pressure Sender: Customer Interest
Oil Pressure Gauge - Flutters/Reads High
Number:
91-451A-8C
Section:
8C
Date:
MARCH 1992
Corporate Bulletin No.: 138304R
ASE No.: A6
Subject:
OIL PRESSURE GAGE FLUTTERS, OR MAY READ HIGH
Model and Year:
1990 CELEBRITY
1990-91 CAPRICE, CAMARO, CAVALIER, CORSICA, BERETTA, LUMINA AND CORVETTE
1990-91 LUMINA (APV)
1990-91 C/K, R/V, S/T, G, M/L, P
THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 91-451-8C, DATED NOVEMBER 1991. PART NUMBER
INFORMATION FOR THE P TRUCK HAS BEEN UPDATED AND DIESEL ENGINES ON TRUCKS. ALL COPIES OF 91-451-8C SHOULD BE
DISCARDED.
Condition:
On vehicles with gages, the oil pressure gage may flutter, or may 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.
Correction:
Check for normal causes of high oil pressure gage readings (high resistence 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 with the correct new part
number from the attached chart.
Warranty Information:
Use existing labor operation N2220.
