PROM - Reverberating Noise/Idle Shake Condition

9232chevy01

Number: 92-94A-6E REVISED

Section: 6E

Date: MARCH 1992

Corporate Bulletin No.: 236505

ASE No.: A2


Subject:
REVERBERATING NOISE AND/OR IDLE SHAKE CONDITION


Model and Year:
1992 CAVALIER WITH 2.2L ENGINE AND AUTOMATIC TRANSMISSION


THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 92-94-6E, DATED FEB. 1992. ADDITIONAL INFORMATION HAS BEEN PROVIDED. ALL COPIES OF 92-94-6E SHOULD BE DISCARDED.

Condition:
Some owners of 1992 J-cars with 2.2L engine and A/T (Automatic Transmission) may comment of a rough idle. In addition to this, some owners may also comment of either a reverberating noise coming from the engine area or seat shake inside the car at idle.

Cause:
This is caused by the engine idle speed exciting a harmonic resonance in the vehicle.

Correction:
New calibrations have been released to raise the engine idle speed in automatic J-cars from 800 to 875 RPM. The J-car calibration has been changed in production. Install the appropriate calibration from the following chart with a T-100 (GM-CAMS) or a Tech 1 according to User's Manual instructions provided with the cartridge. The Tech 1 cartridge part number is TK06032A and should be sent to dealers by February 28, 1992. The calibrations will also be included in the January, 1992 Software Update for the T-100.

Car Trans Emission Part Broadcast Scanner
Body Type Type Number Code I.D.

J Auto Federal 16174821 BALM 4821
J Auto Calif. 16174831 BALN 4831


Labor Operation:
T0500

Labor Time:
0.3 HRS.