REDUCED PERFORMANCE & POWER CHECK ESC MODULE OPERATION

SUBJECT: REDUCED PERFORMANCE AND POWER REPLACE ESC MODULE WITH NEW PART

MOOELS/YEARS: 1991 SILHOUETTE

CONDITION:

------------ Some owners of 1991 Silhouette models built prior to vehicle number MT306593 may comment about reduced performance and power.

CAUSE:

------------ The ECM (Electronic Control Module) may be incorrectly retarding the engine because of incorrect signal from ESC (Electronic Spark Control) module.

CORRECTION:

------------ If normal diagnostics as described in your service manual (Section 6E2-B-3) do not correct this condition, replace ESC module with P/N 16126761 (Broadcast Code ANRZ). Parts are currently available from GMSPO.

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.