Ignition - High Output Coils, Driveability Problems
85PONTIAC05Number 85-6(Gasoline)-40A Date 9/85
Subject: HIGH OUTPUT IGNITION COIL REPLACEMENTS
1984 & 1985 FIREBIRD WITH LB9 & L69 ENGINES
Some 1984 and 1985 Firebirds 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
Years Model RPO Coil Module
1984/85 Firebird L69 1985473 1976908
1984/85 Firebird LB9 1985473 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 for the correct label to be used:
FOR 1984 & 1985
Usage Label Part No.
Firebird With L69 and NA5 14086583
Firebird With L69 and NB2 14086585
Firebird With LB9 and NA5 14086588
Firebird With LB9 and NB2 14086590