ELECTRONIC SPARK CONTROL INCORRECT DIAGRAMS

THE CURRENT ELECTRONIC SPARK CONTROL DIAGRAMS ON PAGES 6D-48 AND 6D-57 OF THE 1984 LIGHT DUTY SERVICE MANUAL ARE INCORRECT. THE DIAGRAMS SHOWN ARE FOR THE 1983 SYSTEM. THE CORRECT DIAGRAMS ARE ILLUSTRATED IN THIS BULLETIN AND SHOULD BE USED WHEN DIAGNOSING 1984 ESC RELATED CONDITIONS. ILLUSTRATION NO. 1 - 1984 5.0L V8 WITH AUTOMATIC TRANSMISSION. ILLUSTRATION NO. 2 - 1984 5.0L V8 WITH MANUAL TRANSMISSION, MY6/M62 ONLY. ILLUSTRATION NO. 3 - 1984 5.0L V8 WITH MANUAL TRANSMISSION, M20 ONLY. THESE DIAGRAMS ARE FOR THE 5.0L V8 ENGINES EQUIPPED WITH FEDERAL AND HIGH ALTITUDE EMISSIONS.

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.