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 MANUALSCHEVROLET1986G 30 VAN V8-379 6.2L DSLREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTECHNICAL SERVICE BULLETINS
1986 Chevrolet G 30 Van V8-379 6.2L DSL
Powertrain Management: Technical Service Bulletins
1986 Chevrolet G 30 Van V8-379 6.2L DSLSECTION Technical Service Bulletins
- Customer Interest
- Electrical - MIL ON/DTC's Set By Various Control Modules
- Electrical - Intermittent MIL/DTC P2138/Reduced Power
- Fuel System - Factors That Affect Economy/Mileage
- Fuel - Gasoline Brands That Clean Port Fuel Injectors
- Backup Lamps/Tailgate Window Release - Inoperative
- Glow Plug - No Cold Start Capability
- A/T - Buzzing Noise at Idle
- Diesel Engine - Surge When Descending A Hill
- Fuels - Effect of Volatility on Driveability
- 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 - Factors That Affect Economy/Mileage
- Fuel - Gasoline Brands That Clean Port Fuel Injectors
- Backup Lamps/Tailgate Window Release - Inoperative
- Glow Plug - No Cold Start Capability
- A/T - Buzzing Noise at Idle
- Diesel Engine - Surge When Descending A Hill
- Fuels - Effect of Volatility on Driveability
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- Driveability
- Erratic Shifting
- High emissions
- Inoperative
- Leaks
- Noise
- Overheating
- Poor performance
- 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
- Fuel System - Factors That Affect Economy/Mileage
- I/M 240 Repairs - Obtaining Technical Assistance
- RTV Sealants - Use on Engines With Oxygen Sensors
- Diesel Engine - Noise Compliance
- Fuel Filter Base - No Longer Contains Restriction Switch
- Engine - Cylinder Damage Due to Glow Plug Breaking
- Fuel Injectors - Remanufactured for TBI Systems
- Tools - Introduction Of The Fuel Injector Tester
- Fuel - Gasoline Brands That Clean Port Fuel Injectors
- Engine Controls - ECM May Contain Wrong PROM
- ECM/PCM - Damaged and/or Misdiagnosed
- Electrical - VSS Connector Mislabeled
- Backup Lamps/Tailgate Window Release - Inoperative
- State Emissions Testing Information
- Enhanced IM240 Program - Implementation Plan
- Emission - Enhanced Inspection Maintenance Programs
- I/M 240 Program - Equipment Purchase
- Enhanced Emission I/M - Program Update
- Enhanced Emission Inspection Maintenance - Equipment
- EVAP System - Service of Connectors
- Engine Controls - Electrostatic Discharge Damage
- Fuel System - Integrator/Block Learn Operation
- Engine Controls - Correction to Diagnostic Charts
- Electrical - Care of Metri-pack 150 Terminals
- Oxygen Sensor Test - Revised Tech 1 Mass Storage CD
- ECM Connectors - Metri-Pack Series 150 Terminal Removal
- Glow Plug - No Cold Start Capability
- A/T Fluid Level Indicator - Available
- A/T - Buzzing Noise at Idle
- Engine - Rough/Unstable/Incorrect Idle
- Diesel Engine - Surge When Descending A Hill
- PROM/MEMCAL - Identification Marks
- Fuels - Effect of Volatility on Driveability
- Fuel - How Fuel Economy Is Determined
- Engine - No Cold Start When Glow Plug Wait Lamp is OFF
- Fuel - Cold Hard Starting Condition
- Fuel - Low Sulfur Diesel, Lubricity Information
- Engine - Glow Plug System Diagnostics
- Glow Plugs - Difficult Cold Start or Restart
- Diesel Engine - Glow Plug Operation and Diagnosis
- Electrical - Speed Sensor Buffer Connector Labeled Wrong
- Fuel - Use of Gasoline Containing 15 Percent MTBE
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- Engine/Fuel System - Oil/Fuel Additive Information
- Fuel System - TOP TIER Detergent Gasoline (Canada)
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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.