SPECIAL POLICY: PROM CHANGE COLD STARTABILITY ADJUSTMENT
Model and Year: 1983-1984 CHEVROLET CAVALIER MODELS EQUIPPED WITH 2.0L ENGINE (VIN CODE P) AUTOMATIC TRANSMISSION AND FEDERAL EMISSION SYSTEMS
TO: ALL CHEVROLET DEALERS
This supercedes Chevrolet Dealer Service Bulletin 84-221 dated November, 1984 and Supplemental Bulletin 84-221(a) dated January, 1985.
Some 1983-1984 Chevrolet Cavalier models equipped with 2.0L engine (RPO LQ5), automatic transmission and Federal Emissions system may experience no starts, poor cold start, and/or spark plug fouling. Tbese starting conditions may be encountered at temperatures below -10 DEG F (-23 DEG C).
SPECIAL POLICY ADJUSTMENT
There are no time nor mileage provisions relating to subject vehicles. This special policy adjustment offer will expire June 30, 1985.
"Special Policy Bulletins," should be filed in the 3 ring binder furnished to the dealer by General Motors in September, 1982.
OWNER NOTIFICATION
Owners of vehicles registered in certain northern states will be notified by letter of this Special Policy by Chevrolet. However, all subject vehicles are covered by this policy regardless of where they are registered or operated.
PREVIOUSLY SERVICED VEHICLES
1983-1984 Chevrolet Cavalier models previously serviced with the cold startability adjustment parts identified in "Chevrolet Service Bulletin 84-221 dated November, 1984," which developed a check engine light (Code 42) can now be corrected. The check engine light in many cases is being generated by false signals to the ECM and can be corrected by installing the correct prom identified in the service procedure of this reissued bulletin.
SERVICE PROCEDURE
PREVIOUSLY SERVICED VEHICLES - The check engine light malfunction may be remedied by the installation of the correct replacement prom identified in this reissued bulletin. In addition 1983 model years will require a new tune up label, P/N 14100954. No further action will be required.
VEHICLES NOT PREVIOUSLY SERVICED
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 1227253, prom.
INSTALL (NEXT TO PRODUCTION LABEL) SUPPLEMENTARY TUNE-UP LABEL, P/N 14100954 FOUND IN PROM PACKAGE.
B. On 1984 models with base axle F75 (3.18) use P/N 1227255, prom. (Refer to service parts Identification Label).
C. On 1984 models with F77 (3.73) performance axle G92, use P/N 1227257, prom. (Refer to service parts Identification Label).
2. On 1983 models set ignition timing to 6 DEG BTDC from 0 DEG TDC. On 1984 models timing should be checked to assure 6 DEG 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 headliner side of driver sun visor. Required on all 1983 models and as required on 1984 models (installed in production Mid - 1984).
THE OWNERS OF CAVALIER VEHICLES SHOULD BE ADVISED COLD WEATHER STARTING PERFORMANCE IS ALSO DEPENDENT ON THE USE OF 5W-30 SF OIL AS SPECIFIED IN THE OWNERS MANUAL.
PARTS INFORMATION
The parts required to perform this Special Policy modification are to be ordered from WDDGM.
To ensure these parts are obtained as soon as possible, they should be ordered from WDDGM on a CIO Order with NO special instruction code, but order on an advise code (2).
Description Usage Part Number ----------- ----- -----------
PROM 1983 1227253 PROM 1984 w/3.18 Axle 1227255 PROM 1984 w/3.73 Axle 1227257 Spark Bypass Relay Kit 1983-84 14086983 Spark Plugs 1983-84 5614009 Sun Visor Starting Label 1983-84 14085150
WARRANTY CLAIM INFORMATION
When performing the repairs outlined in the Service Procedure of this bulletin, submit warranty claim for credit as follows:
Parts Failed **Parts Failure Labor Labor Count Part No. Allowance Code Operation Hours ----- -------- --------- ---- --------- ----- 7 1227253 00 T 1113 . 9
DESCRIPTION: 1983 Model Year Only - Refer to Service Procedure for modification instructions.
Parts Failed **Parts Failure Labor Labor Count Part No. Allowance Code Operation Hours ----- -------- ----------- ---- --------- ----- 7 1227255 00 T1113 . 9
DESCRIPTION: 1984 Model Year Base Axle (3.18) Only - Refer to Service Procedure for modification instructions.
Parts Failed **Parts Failure Labor Labor Count Part No. Allowance Code Operation Hours ----- -------- --------- ---- --------- ----- 7 1227257 00 T1113 .9
DESCRIPTION: 1984 Model Year Optional Axle FW9 or F77 (3.73) Only Refer to Service Procedure for modification instructions.
Parts Failed **Parts Failure Labor Labor Count Part No. Allowance Code Operation Hours ----- -------- --------- ---- ---------- ----- 1 1227253 00 T1127 . 3
DESCRIPTION: Replace appropriate prom and new tune up label,(1983 only) as identified in this bulletin. Vehicle previously repaired under original service bulletin 84-221 and has experienced a check engine light (Code 42).
**The Parts Allowance should be the sum total of the current WDDGM Net plus 30% of all parts required for the repair.
REIMBURSEMENT:
-------------- Claims for customer reimbursement or previously paid repairs are to be submitted to the Chevrolet Zone Office for review and disposition.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.
