Ignition Timing - Spark Knock On Light Acceleration
Models1985 Light Duty Trucks Equipped With 318-2BBL Engine
Subject
Spark Knock
Index
DRIVEABILITY
Date
November 4, 1985
No.
18-37-85
SYMPTOM/CONDITION
A condition of spark knock may exist under light acceleration or at steady speeds.
PARTS REQUIRED
1 Authorized Modification Label PN 4275086
REPAIR PROCEDURE
1. Retard basic timing 4~ for VECI label specifications as follows:
^ Federal 5.2 - 2BBL - reset timing from 12~ BTDC to 8~ BTDC.
^ California or High Altitude 5.2 - 2BBL - reset timing from 8~ BTDC to 4~ BTDC.
2. Type information on Authorized Modification Label, PN 4275086, as shown in Figure 1.
POLICY:
Reimbursable within the provisions of the warranty
TIME ALLOWANCE:
Labor Operation No.
08-15-01-93
Pick-Up Trucks/Sport Utility 0.2 Hrs.
Vans/Wagons 0.3 Hrs.
FAILURE CODE:
AM - Authorized Modification