DRIVEABILITY IMPROVEMENTS (REPLACE PROM)

SUBJECT: DRIVEABILITY IMPROVEMENTS (REPLACE ESC AND/OR PROM)

MODELS AFFECTED: 1991 ROADMASTER

THIS BULLETIN CANCELS AND SUPERSEDES SERVICE BULLETINS 9l-6E-17 AND 92-6E-12. ALL COPIES OF 91-6E-17 AND 92-6E-12 SHOULD BE DISCARDED. THIS BULLETIN ALSO CONTAINS A NEW PART NUMBER FOR A "FEDERAL" PROM.

CONCERN:

Some owners of 1991 Roadmasters may comment on low speed driveability concerns or engine detonation (spark knock).

CORRECTION:

Replace the ESC and PROM with the parts listed below:

DESCRIPTION PART NUMBER

ESC Module 16175099 Broadcast Code (BARC)

Broadcast Scanner Part Model Code I.D. Number Year Application

AYMJ 5941 16165912 1991 5.OL L03 California emissions

BCDU 1391 16181390 1991 5.OL L03 Federal emissions

Parts are currently available from GMSPO.

WARRANTY INFORMATION:

Labor Operation No.: T0500 Labor Time: 0.4 hour

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.