DRIVEABILITY IMPROVEMENTS (REPLACE PROM)

SUBJECT: DRIVEABILITY IMPROVEMENTS, REPLACE PROM

MODELS/YEARS: 1991-92 CUSTOM CRUISER WITH 5.OL (VIN E) OR 5.7L (VIN 7) ENGINES

This bulletin cancels and supersedes Dealer Technical Bulletin 92-T-68 which should be discarded.

CONDITION: Some 1991 and 1992 Custom Cruiser models with either the 5.OL (VIN E) or 5.7L (VIN 7) engine may exhibit low speed driveability or engine detonation (spark knock).

CORRECTION: The calibrations have been refined to address these concerns. Replace the PROM with the appropriate P/N from the table below:

Note: For Custom Cruiser with 5.OL (VIN E) only. Verify the part number of the following items. These components were factory installed.

DESCRIPTION PART NUMBER ----------- ----------- EGR Valve 17090156 (Stamped on Valve) 17112373 (GMSPO Kit)

ESC Module 16175099 (Broadcast Code BARC)

Model Broadcast Scanner Part Year Application Code I.D. Number ------ ----------- --------- ------- ------ 1991 5.0 (LO3) AYMJ 5941 16165912 California emissions

1991/92 5.OL (LO3) BCDU 1391 16181390 Federal emissions

1991/92 5.7L (LO5) BATJ 5901 16175898 Nationwide emissions

Parts are currently available from GMSPO.

SERVICE INFORMATION:

Labor Operation: T0500

Labor Time: 0.4 hour

Trouble Code: 92

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.