CHUGGLE TIP IN HESITATION REVISED EGR AND PROM

A PROM, #1225707 AND EGR VALVE #17079787 WITH REVISED CALIBRATIONS ARE AVAILABLE FOR ANY COMBINATION OF THE CONDITIONS LISTED BELOW WHICH MIGHT OCCUR ON 1982 CALIFORNIA LESABRES WITH 3.8L, V-6 ENGINES. IT MUST FIRST BE DETERMINED THAT AFFECTED VEHICLE SYSTEMS ARE WITHIN SPECIFICATIONS AND FUNCTIONING NORMALLY BEFORE INSTALLING THESE PARTS. A.CHUGGLE AT 40-45 MPH B.TIP-IN HESITATION VEHICLE SHOULD BE ROAD TESTED TO VERIFY THE OWNER DESCRIBED CONDITIONS . UNLESS ALL OTHER AREAS ARE CORRECT, THE PROM AND EGR VALVE WILL NOT BE EFFECTIVE. USE THE ATTACHED CHECK LISTS FOR ADDITIONAL ASSISTANCE, AS NECESSARY. A.CONDITION: CHUGGLE - ALSO REFERRED TO AS SURGE, IS MOST NOTICEABLE AT 40-45 MPH, AND SHOULD NOT BE CONFUSED WITH "FREEWAY HOP" , A COMMON CONDITION IN MANY AREAS. CONVERTER CLUTCH ENGAGE SPEED IS INCREASED TO 50 MPH FROM 41 MPH. B.CONDITION: TIP-IN HESITATION - MAY BE EXPERIENCED DURING EITHER HOT OR COLD OPERATION, WHILE GOING THROUGH A LIGHT OR MODERATE ACCELERATION PERIOD, FROM A STATIONARY VEHICLE POSITION. IF ANY ONE OR COMBINATION OF CONDITIONS EXIST, INSTALL BOTH PARTS, PROM AND EGR VALVE. THESE PARTS WILL BE USED IN PRODUCTION FOR LATE 1982 MODEL VEHICLES. PARTS INFORMATION OBTAIN THE FOLLOWING TWO (2) PARTS FROM YOUR NORMAL GM PARTS DIVISION WAREHOUSE: A.PROM #1225707 EGR VALVE #17079787 ORIGINAL EQUIPMENT # 16030034 PROM ID BOH WARRANTY INFORMATION LABOR OPERATION NUMBER T0112 TROUBLE CODE 92 LABOR TIME 0.6 HRS. A.REPLACE PROM AND EGR VALVE 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 - 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 - PUMP SHOT 3.VACUUM HOSES, FITTINGS AND CONNECTIONS 4.IGNITION TIMING 5.CARBURETOR FLOAT LEVEL - 9/32 + 1/32 6.C-3 WIRING PROXIMITY TO HIGH VOLTAGE WIRING 7.EFE SYSTEM OPERATION 8.T.A.C. SYSTEM OPERATION 9.OVERHEATING - COOLING SYSTEM PROBLEM 10.INCORRECT SPARK PLUGS 11.BAD FUEL 12.EGR OVERRIDE RELAY CIRCUIT 13.MAP/BARO SENSOR OPERATION

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.