Service Procedure & Parts Information

The following procedure will provide a significant improvement in cold startability of these vehicles.

1. Install a new calibration PROM per the following:

A. On 1983 models use P/N 1226989, PROM.

INSTALL (NEXT TO PRODUCTION LABEL) SUPPLEMENTARY TUNE-UP LABEL P/N 14086563 FOUND IN PROM PACKAGE.

B. On 1984 models with base axle (3.18) use P/N 16047644, PROM. (Refer to service parts Identification Label).

C. On 1984 models with FW9 (3.43) axle use P/N 16047649, PROM. (Refer to service parts Identification Label).
2. On 1983 models set ignition timing at 6~ BTDC from 0~ TDC. On 1984 models timing should be checked to assure 6~ BTDC.

THE TIMING CONNECTOR MAY BE LEFT DISCONNECTED FOR THE NEXT STEP.

3. Install spark bypass relay kit, P/N 14086983 (1983-1984). Detailed instructions are included in the kit package. Reconnect the timing connector from Step 2.

4. Remove and discard the fuse labeled "crank" from the fuse block 2 position (3 amp fuse) (1983-1984).

5. Install new spark plugs, P/N 5614009 (1983-1984).

6. Install starting procedure label, P/N 14085150, on the headliner so it is covered by the driver's sun visor. The label is required on all 1983 models, and on early production 1984 models (installed in production Mid - 1984).

OWNERS OF CIMARRON VEHICLES SHOULD BE ADVISED THAT COLD WEATHER STARTING PERFORMANCE IS ALSO DEPENDENT ON THE USE OF 5W-30 SF MOTOR OIL AS SPECIFIED IN THE OWNER'S MANUAL.

PARTS INFORMATION

Parts required to complete this Special Policy should be obtained from the Parts Distribution Centers of the General Motors Warehousing and Distribution Division. The following parts are to be used:

Description Usage Part Number

PROM 1983 1226989
PROM 1984 w/3.18 Axle 16047644
PROM 1984 w/3.43 Axle 16047649
Spark Bypass Relay Kit 1983-84 14086983
Spark Plugs 1983-84 5614009
Sun Visor Starting Label 1983-84 14085150

To ensure these parts are obtained as soon as possible, they should be ordered from GMWDD on a CIO Order with NO special instruction code, but order on an advise code (2).

If any problems are encountered in obtaining these parts, please follow the three-step procedure as stated in the GM Parts Emergency Order Follow-up Procedure (Refer to GM Parts Policy and Procedure Manual, section IV, pages 32 and 33).