Ignition Timing - Detonation/Spark Knock
83ford23 Article No. 83-3-28SPARK KNOCK/DETONATION - VEHICLES WITH 3.8L ENGINE AND AUTOMATIC TRANSMISSION
LIGHT TRUCKS 1983 F100
CALIBRATION: 3-56D
To service a customer concern of detonation/spark knock, retard the initial timing.
1. Check engine for proper functioning of EGR valve, cooling system, ignition system and carburetion.
2. If no concern is found in step number one, retard the initial timing in 2~ increments up to a maximum of 6~ until detonation level is acceptable.
3. Reset engine carb and fast idle speeds.
Obtain an Authorized Modifications decal and list the date, dealer number and summary of alterations performed. Select a prominent place adjacent to the Vehicle Emission Control Information decal suitable for installing the Authorized Modifications decal. Clean the area, install the decal and cover it with a clear plastic decal shield.
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: M
TIME: "Actual Time" as defined in the Warranty and Policy Manual. DLR. CODING: Basic Part No. DRIVE Code: H9