REDUCED PERFORMANCE & POWER CHECK ESC MODULE OPERATION

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Subject: REDUCED PERFORMANCE AND POWER (REPLACE ESC MODULE WITH NEW PART)

Models Affected: 1991 TRANS SPORT WITH 3.1L (VIN D)

Condition:

----------- Some owners of 1991 Trans Sport models with 3. 1L (VIN D) engine may comment of reduced performance and power on vehicles built prior to VIN MT212419.

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 shop manual (Section 6E2-B-3) do not correct this condition, replace ESC module with P/N 16126761 (Broadcast Code ANRZ).

Use applicable Labor Operations And Times.

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.