HIGH OUTPUT IGNITION COIL HESITATION, SAGS,STUMBLES

SOME 1985 "F", "G", AND "Y" CARS WITH HIGH OUTPUT IGNITION COILS MAY EXHIBIT DRIVEABILITY PROBLEMS RANGING FROM HESITATIONS, SAGS, AND STUMBLES TO COMPLETE IGNITION CUT-OUT. THESE CONDITIONS MAY BE CAUSED BY A SHORT IN THE SECONDARY WINDINGS OF THE HIGH OUTPUT IGNITION COIL CAUSED BY EXTENDED EXPOSURE TO HIGH TEMPERATURES. SHOULD ANY VEHICLE/ENGINE COMBINATION STATED ABOVE EXPERIENCE THE DESCRIBED DRIVEABILITY CONDITIONS AND NORMAL SERVICE PROCEDURES (SEE SERVICE MANUAL) DO NOT CORRECT THE CONDITIONS, THE FOLLOWING STEPS ARE TO BE TAKEN TO PREVENT FUTURE REOCCURRENCES. 1. REPLACE THE HIGH OUTPUT COIL AND DISTRIBUTOR MODULE WITH STANDARD OUTPUT COIL AND MODULE AS LISTED BELOW: MODEL VEHICLE ENGINE REPLACEMENT REPLACEMENT YEAR MODEL RPO COIL MODULE 1985 F,G CAR L69 1985473 1976908 1985 F CAR LB9 1985473 1976908 1985 Y CAR L98 1985474 1976908

2. REMOVE AND REGAP SPARK PLUGS TO .035 INCH. 3. CHECK AND RESET IGNITION TIMING TO SPECIFICATIONS AS INDICATED ON THE VEHICLE EMISSIONS LABEL. ANYTIME A VEHICLE IS MODIFIED FOR AN EMISSION CHANGE (SPARK PLUG GAP), A NEW LABEL IS NEEDED. THE LABEL SHOULD BE AFFIXED IN A READILY VISIBLE POSITION IN THE ENGINE COMPARTMENT AND WHERE POSSIBLE BESIDE AN EXISTING EMISSION CONTROL INFORMATION (TUNE-UP) LABEL AND SHOULD NOT BE AFFIXED TO ANY EQUIPMENT THAT CAN BE EASILY DETACHED FROM THE VEHICLE. REFER TO THE CHART BELOW FOR THE CORRECT LABEL TO BE USED:

FOR 1985 ONLY USAGE REPLACE WITH CHEV "F" WITH L69 AND NA5 14086583 CHEV "F" WITH L69 AND NB2 14086585 CHEV "F" WITH LB9 AND NA5 14086587 CHEV "F" WITH LB9 AND NB2 14086589 "G" WITH L69 AND NA5 14086584 "G" WITH L69 AND NB2 14086586 "Y" WITH L98 AND NA5 LESS NN5 14086591 "Y" WITH L98 AND NA5 WITH NN5 14086592 "Y" WITH L98 AND NM8 14086593

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.