Engine - Chuggle/Tip In/Cold Hesitation
90buick05Model Year 1982
Bulletin No 82-T-88
File In Group 64
Number 28
Date July, 82
SUBJECT: Driveability Corrections
MODELS AFFECTED: 1982 Centurys Equipped With A 3.0L (V6) Federal Engine (VIN Code "E")
A new calibrated PROM and EGR Valve has been released for production and service on 1982 Centurys equipped with Federal 3.OL 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.
Fix
^ Chuggle at 40-50 MPH PROM only (engages at 50 MPH)
^ Tip-in Hesitation EGR only
^ Chuggle 40-60 MPH 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 ORIGINAL EQUIPMENT #
^ PROM # 1225448 16029014
^ 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
^ Park-Neutral Back Up Light Switch Adjustment
^ Base Ignition Timing and Total Advance
^ Spark Plugs and Plug Wires
^ HEI Operation At Problem Speeds
^ Speedometer Needle 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 Connections
- Canister Vent Valve Operation
^ Coolant Sensor and/or Circuit - System Going Open Loop - Closed Loop. Will Cause Chuggle Sensation.
HESITATION CHECK LIST
^ EGR Valve System Operation
^ Acceleration Pump System Operation (pump shot)
^ Vacuum Hoses, Fittings and Connections
^ Ignition Timing
^ Carburetor Float Level - 5/16" +/- 2/32"
^ C-3 Wiring Proximity To High Voltage Wiring
^ EFE System Operation
^ Thermac Air Cleaner (T.A.C.) System Operation
COLD DRIVEABILITY HESITATION CHECK LIST
^ Accelerator Pump System Operation (pumpshot)
^ Vacuum Breaks
^ Choke
^ Carburetor Float Level Using External Gage to 5/16" +/- 2/32"
^ EGR Valve Operation
^ Park-Neutral Back Up Light switch Adjustment
^ Thermac Air Cleaner (T.A.C ) Operation, Including Stove Pipe to Air Cleaner
^ HEI Operation
Evaporative Emission Control System (EECS)
- Purge Solenoid Operation
- Hoses and Hose Connections
- Canister Vent Valve Operation
^ Base Timing and Electronic Spark Timing (EST)
^ Early Fuel Evaporation System
^ Mixture Control Solenoid Checks
- Paddle Travel of 4/32" +/- 1/32"
- Dwell Meter Reading of 30~ - 45~ at 3000 RPM in Park (This Setting Made By Adjusting The Rich Mixture Screw, Will Affect solenoid Travel In Most Instances)
- Dwell Reading of 30~ - 35~ At Idle In Drive (This Setting Made By Adjusting Idle Mixture Screws)
- Spark Plugs and Plug Wires