For 1990-2009 cars

# COLD DRIVABILITY CORRECTIONS EGR AND PROM REPLACEMENT

A NEW CALIBRATED PROM AND EGR VALVE HAS BEEN RELEASED FOR PRODUCTION AND SERVICE ON 1982 "B" CARS EQUIPPED WITH FEDERAL 3.8L ENGINES. THESE PARTS ARE TO BE USED FOR DEALER CORRECTION IF ANY ONE OF OR COMBINATION OF THE CONDITIONS LISTED BELOW, WHEN IT HAS BEEN DETERMINED THAT AFFECTED SYSTEMS ARE WITHIN SPECIFICATION AND ARE FUNCTIONING NORMALLY. A.CHUGGLE AT 40-45 MPH B.TIP-IN HESITATION C.COLD DRIVEABILITY HESITATION 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 DETERMINED 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 ATTACHED CHECKLIST FOR ASSISTANCE WHEN NECESSARY. ANY TIME ONE OF THE THREE (3) OR ALL THREE (3) CONDITIONS ARE ENCOUNTERED AND THE ATTACHED CHECKLIST DID NOT ASSIST IN CURING THE CONDITION, USE THE PROM AND EGR, FOR ALL THREE (3) CONDITIONS. ONE PART CAN NOT BE INSTALLED WITHOUT THE OTHER. ZONE AUTHORIZATION IS REQUIRED PRIOR TO USAGE OF THE PROM AND EGR VALVE. PARTS ORDERING INFORMATION: OBTAIN THE REQUIRED PART(S) FROM YOUR NORMAL GM PARTS DIVISION WAREHOUSE: GM PARTS DIVISION WILL NOTIFY DEALERS THROUGH A SALES INFORMATION BULLETIN WHEN PARTS ARE AVAILABLE. A.PROM #1226030 EGR VALVE #17079014 PROM ID BBK ORIGINAL EQUIPMENT# 16026734 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 - INCLUDES CHECKING FOR CORRECT DISTRIBUTOR WAVE WASHER 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 HESITATION CHECK LIST: 1.EGR VALVE SYSTEM OPERATION 2.ACCELERATOR PUMP SYSTEM OPERATION - INCLUDES CHECKING DISCHARGE CHECK BALL SEATING 3.VACUUM HOSES, FITTINGS AND CONNECTIONS 4.IGNITION TIMING 5.CARBURETOR FLOAT LEVEL 6.C-3 WIRING PROXIMITY TO HIGH VOLTAGE WIRING 7.EFE SYSTEM OPERATION 8.T.A.C. SYSTEM OPERATION COLD DRIVEABILITY HESITATION CHECK LIST: 1.VACUUM BRAKES 2.CHOKE 3.CARBURETOR FLOAT LEVEL USING EXTERNAL GAGE TO 5/16" 4.EGR VALVE OPERATION 5.PARK-NEUTRAL BACK UP LIGHT SWITCH ADJUSTMENT 6.THERMAC AIR CLEANER (T.A.C.) OPERATION INCLUDING STOVE PIPE TO AIR CLEANER 7.HEI OPERATION 8.EVAPORATIVE EMISSION CONTROL SYSTEM (EECS) - PURGE SOLENOID OPERATION - HOSES AND CONNECT HOSE CONNECTIONS - CANISTER VENT VALVE OPERATION A.BASE TIMING AND ELECTRONIC SPARK TIMING (EST) B.EARLY FUEL EVAPORATION (EFE) SYSTEM C.MIXTURE CONTROL SOLENOID ADJUSTMENT AND CHECKS - SOLENOID SCREW ADJUSTMENT OF 3 1/4 TO 3 1/2 TURNS FROM BOTTOMED POSITION - PADDLE TRAVEL OF 4/32" - DWELL METER READING OF 35F - 40F 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.