For 1990-2009 cars

# 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.