Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBUICK1985CENTURY V6-231 3.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTECHNICAL SERVICE BULLETINS
1985 Buick Century V6-231 3.8L
Powertrain Management: Technical Service Bulletins
1985 Buick Century V6-231 3.8LSECTION Technical Service Bulletins
- Recalls
- Customer Interest
- Electrical - MIL ON/DTC's Set By Various Control Modules
- Electrical - Intermittent MIL/DTC P2138/Reduced Power
- Fuel System - Pump Noise Heard Inside Cabin
- Engine - No Start When Parked On Incline
- Fuel - Extended Crank, Driveability/Low Fuel Pressure
- Fuel Pump - Noise
- Engine - Stalling While Shifting Into Reverse or Drive
- A/T - TCC Engages In 2nd Gear
- Fuel Injectors - Diagnose/Cleaning Restricted Injectors
- Engine - Miss, Hesitation, or Roughness
- Engine Controls - Flickering Service Engine Soon/Code 44
- Connector Terminals - Contact Checking Procedure
- Engine - Poor Warm Up Performance/Hard Cold Start
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- By Symptom
- Abnormal wear/deterioration
- Customer Interest
- Electrical - MIL ON/DTC's Set By Various Control Modules
- Electrical - Intermittent MIL/DTC P2138/Reduced Power
- Fuel System - Pump Noise Heard Inside Cabin
- Engine - No Start When Parked On Incline
- Fuel - Extended Crank, Driveability/Low Fuel Pressure
- Fuel Pump - Noise
- Engine - Stalling While Shifting Into Reverse or Drive
- A/T - TCC Engages In 2nd Gear
- Fuel Injectors - Diagnose/Cleaning Restricted Injectors
- Engine - Miss, Hesitation, or Roughness
- Engine Controls - Flickering Service Engine Soon/Code 44
- Connector Terminals - Contact Checking Procedure
- Engine - Poor Warm Up Performance/Hard Cold Start
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- Driveability
- Fuel - Extended Crank, Driveability/Low Fuel Pressure
- Engine - Stalling While Shifting Into Reverse or Drive
- Fuel Injectors - Diagnose/Cleaning Restricted Injectors
- Engine - Miss, Hesitation, or Roughness
- Engine - Poor Warm Up Performance/Hard Cold Start
- Fuel - Effect of Fuel Volatility On Driveability
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- Fuel System - TOP TIER Detergent Gasoline
- Erratic Operation
- Erratic Shifting
- False instrument warning light/gauges
- High emissions
- Low, Dead battery
- No shift/Incorrect gear engagement
- Noise
- Poor performance
- Recalls
- Smoke, Fumes
- Starting problems
- All Technical Service Bulletins
- Vehicle - Engine And Sub Systems Flushing Info. (CANADA)
- Vehicle - Engine And Sub-Systems Flushing Recommendations
- Engine - THIS BULLETIN HAS BEEN CANCELED
- Fuel System - Fuel Injector Maintenance Cleaning
- Fuel System - GM Fuel System Treatment PLUS(R) Info.
- Electrical - MIL ON/DTC's Set By Various Control Modules
- Electrical - Intermittent MIL/DTC P2138/Reduced Power
- I/M 240 Repairs - Obtaining Technical Assistance
- Engine Controls - TPS Specifications
- Fuel System - Pump Noise Heard Inside Cabin
- Engine - No Start When Parked On Incline
- Fuel - Extended Crank, Driveability/Low Fuel Pressure
- Fuel Pump - Noise
- Fuel - Pump Replacement Caution, Strainer
- Ignition - Spark Plug Application & Gap
- Engine - Stalling While Shifting Into Reverse or Drive
- A/T - New Torque Converter Clutch Solenoid Screen
- A/T - TCC Engages In 2nd Gear
- MAP - Revised Chart C-1D, DTC's 33, 34, 63, 64
- Tools - Inoperative Fuel Injector Cleaning Tool
- Fuel Injectors - Diagnose/Cleaning Restricted Injectors
- Tools - New Fuel Injection Tester
- Tools - Introduction Of The Fuel Injector Tester
- Engine Controls - Integrator/Block Learn Explained
- Oxygen Sensors - Silica Contamination
- Battery - Revised Ammeter Connecting (Parasitic Drain)
- Engine Controls - Use of Crank Sensor Adjusting Tool
- Recall - Emitting Excessive Pollutants, New PROM
- Fuel - Carburetor Adjustment Specifications & Changes
- Fuel - Feed/Return Pipe Repairs
- Fuel Line - O-Rings Composition
- Policy - Turbocharger Parts Return
- Engine Controls - Revised Diagnostics Code 53, EGR
- Emissions - Effects of Top Engine Cleaner on Converter
- Engine - Miss, Hesitation, or Roughness
- Emissions Testing Vehicle Preconditioning
- Enhanced IM240 Program - Implementation Plan
- Emission - Enhanced Inspection Maintenance Programs
- I/M 240 Program - Equipment Purchase
- I/M Emissions Diagnostic Manual -Program
- Enhanced Emission I/M - Program Update
- Enhanced Emission Inspection Maintenance - Equipment
- Engine Controls - Flickering Service Engine Soon/Code 44
- EVAP System - Service of Connectors
- Engine Controls - Damage to Wiring Terminals
- Engine Controls - Revised System Performance Check
- Oxygen Sensor Test - Revised Tech 1 Mass Storage CD
- Connector Terminals - Contact Checking Procedure
- Engine - Poor Warm Up Performance/Hard Cold Start
- PROM/MEMCAL - Identification Marks
- Fuel - How Fuel Economy Is Determined
- A/T - New Thermo Element/Setting Procedure
- Fuel - Reformulated/Oxygenated Gasolines
- Fuel - Use of MTBE At 15% or Less In Gasolines
- Fuel - Effect of Fuel Volatility On Driveability
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- Fuel System - E85 Fuel Usage Precaution
- Engine/Fuel System - Oil/Fuel Additive Information
- Fuel System - TOP TIER Detergent Gasoline (Canada)
- Fuel System - TOP TIER Detergent Gasoline
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.