Ignition Timing Procedure - Manual Update

90ford27 ENGINE/ EMISSIONS DIAGNOSIS SHOP MANUAL- 1983-1990---NOTE ADDED TO UPDATE INITIAL TIMING PROCEDURE
Article No. 90-18B-2
FORD: 1983 EXP 1984-86 LTD 1984-90 CROWN VICTORIA, MUSTANG, TEMPO, THUNDERBIRD 1986-90 TAURUS

LINCOLN-MERCURY: 1983 LN7
1983-84 LYNX 1984-86 MARQUIS 1984-90 CONTINENTAL, COUGAR, GRAND MARQUIS, MARK VII, TOPAZ, TOWN CAR 1986-90 SABLE

LIGHT TRUCK: 1984-90 BRONCO II, BRONCO, ECONOLINE, F-150, F-250, F-350, RANGER 1986-90 AEROSTAR

ISSUE: All 1983 through 1990 vehicles with TFI-IV ignition systems may exhibit spark knock/ping if base ignition timing was set after starting the engine with a remote starter. If the engine is started with a remote starter (start wire "S" terminal disconnected at the starter relay) the ignition module will remain in the start mode (timing retarded). Ignition timing will be incorrectly advanced if base timing is set while the module is in the start mode. The engine must be started with the start wire connected, using the ignition switch to correctly set the base ignition timing. The following Shop Manuals and pages are affected:



^ 1983 Engine/Emissions Diagnosis Shop Manual page 15-3

Revised 8/90:

^ 1984-1988 Engine/Emissions Diagnosis Shop Manual page 15-1

Revised 8/90:

Revised 8/90:

^ 1989-1990 Engine/Emissions Diagnosis Shop Manual page 13-2

ACTION: Refer to the pages following this TSB article for the revised Initial Timing Procedures. The following note has been added to each page: NOTE: Do not use a remote starter when setting timing. Use the ignition key to start the vehicle.


OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 490000