Capri V8-302 5.0L (1982)
shield.
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: SP-12199-A-82
TIME: 1.0 Hrs.
DLR. Coding: Basic Part No.: DRIVE - Code: H9
Technical Service Bulletin # 812515
Date: 811215
Engine - Spark Knock/Detonation
Article No:
81-25-15
12/15/81
Subject:
Engine Detonation with 2150 2V Carburetor
FORD
1982 - Ford, Granada, Mustang, Fairmont, T-bird With 4.2L And 5.0L Engines (except California)
Calibrations: All With 2150 - 2V Carburetors
LINCOLN-MERCURY
1982 - Monarch, Capri, XR7, Zephyr With 4.2L And 5.0L Engines (except California)
Calibrations: All With 2150 - 2V Carburetors
WARNING:
This Modification Is Authorized Only For The Listed Engine Calibrations. Performing This Modification On Other Engine Calibrations Is
Unauthorized And Could Create Liability Under Applicable Federal Or Local Laws.
Spark knock and/or detonation in subject vehicles may be corrected by retarding the initial timing as follows:
1.
Check initial ignition timing to be sure it is to the specification on the Vehicle Emission Decal.
2.
Check to be sure all vacuum lines are connected and seated and they are not kinked, cracked or broken.
3.
Vehicles with AOD and dual mode ignition systems. Check operation of ignition timing vacuum switch (12A265) as follows:
a. Check ignition timing with vacuum switch fully connected - both electrically and to the vacuum supply.
b. Recheck ignition timing with the vacuum line removed from the switch. If the timing is not retarded 2-4° the switch is inoperative and must be
replaced.
4.
Check to be sure the EGR valve is functional per Section 29-15 of the Car Shop Manual.
5.
Test vehicle to determine if detonation is eliminated.
6.
Retard the ignition timing in 2° increments to a maximum of 6° from the specification on the Vehicle Emission Decal. Refer to Car Shop Manual,
Section 29-02.
NOTE:
Light detonation during a heavy crowd drive mode is acceptable.
7.
Check idle speeds. Reset as required.
