Spark Advance - Adjustment Procedure

9207chrysler01

NO.: 18-17-91

GROUP: DRIVEABILITY

DATE: Dec. 2, 1991


SUBJECT: Spark Advance Adjustment Procedure


MODELS:

1992 (AC) DYNASTY/NEW YORKER SALON (AS) CARAVAN/GRAND CARAVAN/CARAVAN C/V VOYAGER/GRAND VOYAGER/TOWN & COUNTRY (AY) IMPERIAL/NEW YORKER FIFTH AVENUE


DISCUSSION:

The 3.3L/3.8L engines for 1992 are not equipped with knock sensors and may exhibit spark knock under certain conditions. Therefore, spark advance can be adjusted on these engines using the DRB II. This feature permits retarding the ignition timing on DIS (Distributorless Ignition Systems) by up to 6 degrees, in 2 degree steps. Ignition timing will then be retarded by the selected amount across the entire engine operating range.


DIAGNOSIS:

Before adjusting spark advance the following two conditions must be met:

1. The vehicle must be using fuel with an octane rating of at least 85 R+M/2.

2. The EGR system (if so equipped) must be functioning normally.

Vehicles exhibiting spark knock and meeting these conditions can have the following procedure performed.


PARTS REQUIRED

1 AUTHORIZED MODIFICATION LABEL 4275086


REPAIR PROCEDURE:

Spark advance adjusting procedure.

NOTE: EXCESSIVE SPARK RETARD CAN EFFECT FUEL ECONOMY AND ENGINE PERFORMANCE. USE THE MINIMUM SPARK RETARD REQUIRED TO ELIMINATE THE SPARK KNOCK CONDITION.

1. Using the 1992 3.3L/3.8L MPI Diagnostic Service Cartridge, connect the DRB II to the vehicle.


2. Select "(4) SELECT SYSTEMS".

3. Select "(1) ENGINE".

4. Select "(1) WITH A/C" or "(2) WITHOUT A/C".

5. Select "(1) FUEL/IGNITION".

6. Select "(5) ADJUSTMENTS".

7. Select "(4) SPARK ADVANCE".

8. Retard timing by the desired amount (2, 4, or 6 degrees).

Figure 1:

9. Type authorized modification label, PN 4275086, as shown in Figure 1 and attach near VECI label.


* Insert number of degrees timing was adjusted (2, 4, or 6)


POLICY: Reimbursable within the provisions of the warranty.


TIME ALLOWANCE Labor Operation No. 08-15-76-92 . . . . . . . . . . . 0.3 Hrs.


FAILURE CODE: 50 - Improper Adjustment