HIGH OUTPUT IGNITION COIL HESITATION, SAGS,STUMBLES

VEHICLES AFFECTED: 1984-85 L69 'F' and 'G' Cars, 1985 LB9 'F' Car, and 1985 L98 'Y' Car -----------------------------------------------

Some 1985 'F', 'G', and 'Y' cars with high output ignition coils may exhibit driveability conditions ranging from sags, and stumbles to 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 repair the conditions, the following steps are to be taken:

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 FCar LB9 1985473 1976908

1985 YCar 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 serviced 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 ----- ------------ Camaro With L69 and NA5 14086583

Camaro With LB9 and NA5 14086587

Monte Carlo With L69 and NA5 14086584

Corvette With L98 and NA5 Less NN5 14086591

Corvette With L98 and NA5 With NN5 14086592

Corvette With L98 and NM8 14086593

Firebird With LB9 and NA5 14086588

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.