EXPERTEC Technical Service Bulletins (91-6-27)
Publication date: 1991-02-20Reference number: 91-6-27
EXPERTEC TECHNICAL SERVICE BULLETINS
TECHNICAL SERVICE BULLETIN
Reference Number(s): 91-6-27, Date of Issue:
February 20, 1991
| Model(s):: | 1991 Pontiac 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).
WARRANTY INFORMATION
Use applicable labor operations and times.