CHUGGLE,TIP-IN, HESITATION PROM AND EGR REPLACEMENT

A NEW CALIBRATED PROM AND EGR VALVE HAS BEEN RELEASED FOR PRODUCTION AND SERVICE ON 1982 CENTURYS EQUIPPED WITH FEDERAL 3.0L ENGINES. THESE PARTS ARE TO BE USED FOR DEALER CORRECTION IF ANY ONE OF OR COMBINATION OF THE CONDITIONS LISTED BELOW EXIST AFTER IT HAS BEEN DETERMINED THAT AFFECTED SYSTEMS ARE WITHIN SPECIFICATIONS AND ARE FUNCTIONING NORMALLY. CHUGGLE AT 40-50 MPH FIX: PROM ONLY (ENGAGES AT 50 MPH) TIP-IN HESITATION FIX: EGR ONLY CHUGGLE 40-60 MPH FIX: PROM & EGR (EGR REDUCES LIGHTER THAN ROAD LOAD CHUGGLE) BEFORE A DECISION IS MADE TO INSTALL A PROM AND EGR VALVE, VEHICLE SHOULD BE ROADTESTED, IF POSSIBLE, FOR THE OWNER DESCRIBED CONDITIONS AND VEHICLE SYSTEMS CHECKED TO DETERMINE IF ADJUSTMENTS ARE WITHIN SPECIFICATIONS. UNLESS ALL AREAS LISTED ON THE CHECKLIST ARE CORRECT, A PROM AND EGR VALVE WILL NOT BE EFFECTIVE FOR THE PURPOSE INTENDED. USE THE ENCLOSED CHECKLIST FOR ASSISTANCE WHEN NECESSARY. ANY TIME ALL OF THE THREE (3) CONDITIONS ARE ENCOUNTERED AND THE ENCLOSED CHECKLIST DID NOT ASSIST IN CURING THE CONDITION, USE THE PROM AND EGR, FOR ALL THREE (3) CONDITIONS. PARTS ORDERING INFORMATION OBTAIN THE REQUIRED PART(S) FROM YOUR NORMAL GM PARTS DIVISION WAREHOUSE: PROM ID: PROM #1225448 ORIGINAL EQUIPMENT #: 16029014 PROM ID: EGR VALVE #17079563 WARRANTY INFORMATION *USE PUBLISHED OPERATION AND TIME FOR EGR REPLACEMENT *LABOR OPERATION FOR PROM REPLACEMENT - T0110 0.3 HOUR *LABOR OPERATION FOR PROM AND EGR REPLACEMENT - T0111 0.6 HOUR TROUBLE CODE FOR ANY ONE OF ABOVE IS 92. *SYSTEM PERFORMANCE CHECK NOT NECESSARY. CHUGGLE CHECK LIST 1.PARK-NEUTRAL BACK UP LIGHT SWITCH ADJUSTMENT 2.BASE IGNITION TIMING AND TOTAL ADVANCE 3.SPARK PLUGS AND PLUG WIRES 4.HEI OPERATION AT PROBLEM SPEEDS 5.SPEEDOMETER NEEDLE FOR FLUCTUATION (STICKING OR KINKED CABLE AND/OR SPEEDO HEAD WILL CAUSE VEHICLE SPEED SENSOR (VSS) TO ENGAGE - DISENGAGE TCC) 6.EVAPORATIVE EMISSION CONTROL SYSTEM (EECS) - PURGE SOLENOID OPERATION - HOSES AND CORRECT HOSE CONNECTIONS - CANISTER VENT VALVE OPERATION 7.COOLANT SENSOR AND/OR CIRCUIT - SYSTEM GOING OPEN LOOP - CLOSED LOOP. WILL CAUSE CHUGGLE SENSATION. HESITATION CHECK LIST 1.EGR VALVE SYSTEM OPERATION 2.ACCELERATION PUMP SYSTEM OPERATION (PUMP SHOT) 3.VACUUM HOSES, FITTINGS AND CONNECTIONS 4.IGNITION TIMING 5.CARBURETOR FLOAT LEVEL - 5/16" + 2/32" 6.C-3 WIRING PROXIMITY TO HIGH VOLTAGE WIRING 7.EFE SYSTEM OPERATION 8.THERMAC AIR CLEANER (T.A.C.) SYSTEM OPERATION COLD DRIVEABILITY HESITATION CHECK LIST 1.ACCELERATOR PUMP SYSTEM OPERATION (PUMPSHOT) 2.VACUUM BREAKS 3.CHOKE 4.CARBURETOR FLOAT LEVEL USING EXTERNAL GAGE TO 5/16" + 2/32" 5.EGR VALVE OPERATION 6.PARK-NEUTRAL BACK UP LIGHT SWITCH ADJUSTMENT 7.THERMAC AIR CLEANER (T.A.C.) OPERATION, INCLUDING STOVE PIPE TO AIR CLEANER 8.HEI OPERATION 9.EVAPORATIVE EMISSION CONTROL SYSTEM (EECS) - PURGE SOLENOID OPERATION - HOSES AND HOSE CONNECTIONS - CANISTER VENT VALVE OPERATION 10.BASE TIMING AND ELECTRONIC SPARK TIMING (EST) 11.EARLY FUEL EVAPORATION (EFE) SYSTEM 12.MIXTURE CONTROL SOLENOID CHECKS - PADDLE TRAVEL OF 4/32" + 1/32" - DWELL METER READING OF 30F - 45F AT 3000 RPM IN PARK (THIS SETTING, MADE BY ADJUSTING THE RICH MIXTURE SCREW, WILL AFFECT SOLENOID TRAVEL IN MOST INSTANCES) - DWELL READING OF 30F - 35F AT IDLE IN DRIVE (THIS SETTING MADE BY ADJUSTING IDLE MIXTURE SCREWS) - SPARK PLUGS AND PLUG WIRES

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.