Engine - Chuggle/Tip In/Cold Hesitation

90buick05

Model Year 1982

Bullerin No. 82-T-6

File in Group 64

Number 4

Date Dec. '81
SUBJECT: Driveability Corrections


MODELS AFFECTED: 1982 Regals Equipped With 3.8L (LD5) Federal Engines


A new calibrated PROM and EGR valve have been released for production and service on 1982 Regals equipped with Federal 3.8L engines. These parts are to be used for dealer correction of 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.

^ Chuggle at 40-45 MPH (Use PROM only)
^ Tip-in Hesitation (Use EGR valve only)
^ Cold Driveability Hesitation (Use PROM and EGR)

Before a decision is made to install a PROM and/or an 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/or 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 conditions are encountered and the attached checklist did not assist in curing the condition, use the PROM and/or EGR, or use both for all three (3) conditions. ONE PART CAN BE INSTALLED WITHOUT THE OTHER.

Zone authorization is required prior to usage of the PROM and/or EGR valve.

PARTS ORDERING INFORMATION

Obtain the required part(s) from your normal GM Parts Division Warehouse:

^ PROM 1225704
^ EGR Valve 17078431
WARRANTY INFORMATION

PROM - Labor operation T0060 .2 hour.

System Performance Check will not be required with this change.

EGR - Labor operation J6270 .3 hour.

Use Trouble Code 92 for either or both operations.

CHUGGLE CHECK LIST

^ Park-Neutral Back up Light Switch Adjustment
^ Base Ignition Timing and Total Advance
^ Spark Plugs and Plug Wires
^ HEI Operation at Problem Speeds
- Includes checking for correct Distributor Wave Washer
^ Speedometer Need for Fluctuation (Sticking or Kinked Cable and/or Speedo Head will cause Vehicle Speed Sensor (VSS) to Engage Disengage TCC)
^ Evaporative Emission Control System (EECS)
- Purge Solenoid Operation
- Hoses and Correct Hose Connection
- Canister Vent Valve Operation

HESITATION CHECK LIST

^ EGR Valve System Operation
^ Accelerator Pump System Operation
- Includes checking discharge check ball seating
^ Vacuum Hoses, Fittings and Connections
^ Ignition Timing
^ C-3 Wiring Proximity to High Voltage Wiring
^ EFE System Operation
^ T.A.C. System Operation

COLD DRIVEABILITY HESITATION CHECK LIST

^ EGR Valve Operation
^ Park-Neutral Back up Light Switch Adjustment
^ Thermac air cleaner (TAC) Operation
^ H.E.I. Operation
^ Evaporative Emission Control System (EECS)
- Purge Solenoid Operations
- Hoses and Connect Hose Connections
- Canister Vent Valve Operation
^ Base Timing and Electronic Spark Timing (EST)
^ Early Fuel Evaporation (EFE) System
^ Spark Plugs and Plug Wires