REVISED ECM CALIBRATION PKG. COLD START AND ROUGH IDLE

VEHICLES AFFECTED: All 1985 'J' Models (Except Cadillac) with 2.0L (LQ5) Engine and Canadian Emissions

A new calibration package has been released to production for the 1985 2.0L 'J' models equipped with Canadian Emissions Certification (NM5). This package offers improved idle quality and cold start driveability. The following chart indicates productiion usage and break points.

SERVICE VIN ECM B/C PROM BREAK POINT APPLICATION --- --- ---- ------------ ------------ 16052241 HHJ 16051249 CHEV - 156693 All JA00 (Except JE67) PONT - 546146 & LQ5 & F75 & C41 & NM5 BUICK - 434740 OLDS - 323309 16052251 HHK 16051257 CHEV - 157272 All JA00 (Except JE67) PONT - 546582 & LQ5 & FW9 & NM5 OR BUICK - 435063 & LQ5 & F75 & C60 & NM5 OLDS - 323510 1JE67 & LQ5 & NM5

LQ5 - 2.0L engine F75 - 3.18 Axle FW9 - 3.43 Axle C41 - Base Heater C60 - Air Conditioning NM5 - Canadian Emission Certification

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.