For 1990-2009 cars

# WHISTLE NOISE WHILE DRIVING 30 - 40 MPH

#### SUBJECT: WHISTLE NOISE WHILE DRIVING 30-40 MPH (48-64 KM/H) (REPLACE THROTTLE BODY ASSEMBLY)

#### MODELS: 1998 BUICK LESABRE, PARK AVENUE 1998 OLDSMOBILE EIGHTY EIGHT, EIGHTY EIGHT LS, LSS, REGENCY 1998 PONTIAC BONNEVILLE WITH 3800 ENGINE (VIN K - RPO L36) VEHICLES BUILT BEFORE JANUARY 30, 1998

#### CONDITION:

SOME OWNERS MAY COMMENT THAT WHILE DRIVING APPROXIMATELY 30-40 MPH (48-64 KM/H) UP A SLIGHT GRADE, THEY HEAR A WHISTLE TYPE NOISE.

#### CAUSE:

THE THROTTLE BODY AIR BLADE IS CONTOURED AND MAY BE CAUSING THE WHISTLE NOISE.

#### CORRECTION:

DIAGNOSTICS -

INSTALL A SCAN TOOL AND MONITOR THROTTLE POSITION SENSOR (TPS) AND VEHICLE SPEED SENSOR (VSS). DRIVE THE VEHICLE BETWEEN 20-25% TPS AT 30-40 MPH (48-64 KM/H) AS INDICATED ON THE SCAN TOOL. THE THROTTLE ANGLE MUST REMAIN STEADY FOR 3-4 SECONDS IN ORDER FOR THE WHISTLE TYPE NOISE TO BE HEARD. IF THE WHISTLE NOISE IS HEARD, THEN TRY VARYING THE THROTTLE ANGLE TO DETERMINE IF THE WHISTLE NOISE IS AFFECTED. IF YES, THEN REPAIR THE VEHICLE AS FOLLOWS.

REPLACE THE THROTTLE BODY ASSEMBLY WITH PART NUMBER 24507238. THIS ASSEMBLY HAS A REDESIGNED AIR BLADE PROFILE.

#### PART INFORMATION:

PART NUMBER PART NAME 24507238 BODY ASM, THROTTLE

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

#### WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION DESCRIPTION LABOR TIME J5485 BODY, THROTTLE USE PUBLISHED R + R LABOR OPERATION TIME

FIGURES: 0 ATTACHMENTS: 0

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.

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