OIL PRESSURE GAGE READS HIGH FLUTTERS (REPL. SENSOR)

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

VEHICLES AFFECTED: 1990-91 CARS A,B,F,J,L,N,W,Y TRUCKS C1,C2,C3,K1,K2,K3, R1,R2,R3,V1,V2,V3,S1,T1,G1,G2,G3,L1,M1, P1,P2,P3,UO

BULLETIN BEING REVISED TO UPDATE PART NUMBER INFORMATION FOR P-TRUCK, AND FOR DIESEL ENGINES ON TRUCKS.

Condition:

--------- On vehicles with gauges, the oil pressure gauge 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 gauge readings (high resistance or open circuit) such as a poor ground path, caused by loose sensor mounting, a loose oil cooler adapter, 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 labour operation N2220.

NEW OIL PRESSURE SENSOR PART NUMBERS 1990-91 Models ------------------------------------ Engine Carline Engine(s) VIN Codes New P/N Replaces ------- --------- --------- ------- -------- A LR8(90) R 10045775 Existing LR8(91) R 10205676 10096200 LHO(90) T 10205410 10096199 LHO(91) T 10205676 10096200 LG7 N 25605389 3520321

*B (91) L03/L05 E,7 10205411 10096207

F LHO T 10205410 1643535 L03/LB9/L98 E,F,8 10205411 10096207

J/N/L exc. LD2/LGO G,K,M,N,T,U 10191433 1647135 LD2/LGO A,D 22578692 22542436

W LRB R 10205676 10096200 LHO(90) T 10205410 10096199 LHO(91) T 10205676 10096200 LQ1 X 10207183 10137630 LD2/LGO D,A 22578692 22542436 L27 L 25605389 3520321

Y L98 8 10205410 10096199 LT5 10205675 10096170 Trucks

L/M All B,Z 10096178 1647135

S/T LN8/L38 A,E 10096178 1647135 LB4/LL2 Z,R 10096179 1647136

U Van LG6(90) D 10205410 10096199 LG6(91) D 10205676 10096200

CKRVG All Gas All 10137652 10068563 (a)P (91) All Gas All 10096178 1647135 P (90) All Gas All 10137652 10068563 CKRV Diesel C,J 15564999 N/A PG Diesel C,J 15591103 N/A

* 1990 B-Car is not affected by this bulletin..

(a) Refer to bulletin 92-8-115 for additional details.

NOTE: Refer to bulletin 91-8-152 for additional applications.

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.