Throttle Body -Whistle Noise At 30 to 40 MPH

File In Section: 6E Engine Fuel & Emission

Bulletin No.: 87-65-11

Date: March, 1998

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. It 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.

Parts Information

Part Number Description

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
Labor Operation
Time