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 MANUALSCHEVROLET1986CAPRICE WAGON V8-307 5.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTECHNICAL SERVICE BULLETINS
1986 Chevrolet Caprice Wagon V8-307 5.0L
Powertrain Management: Technical Service Bulletins
1986 Chevrolet Caprice Wagon V8-307 5.0LSECTION 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
- Oil Filter - Changing as a Result of Fouled Plugs
- Fuel - Gasoline Brands That Clean Port Fuel Injectors
- Engine - Surge After a Hot Soak
- Engine - High Ambient Cold Startability and Long Crank
- Engine - Miss, Hesitation, or Roughness
- Engine - Tip-In Sag/Hesitation/Rough Idle
- 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
- Oil Filter - Changing as a Result of Fouled Plugs
- Fuel - Gasoline Brands That Clean Port Fuel Injectors
- Engine - Surge After a Hot Soak
- Engine - High Ambient Cold Startability and Long Crank
- Engine - Miss, Hesitation, or Roughness
- Engine - Tip-In Sag/Hesitation/Rough Idle
- Fuels - Effect of Volatility on Driveability
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- Driveability
- Oil Filter - Changing as a Result of Fouled Plugs
- Engine - Surge After a Hot Soak
- Engine - High Ambient Cold Startability and Long Crank
- Engine - Miss, Hesitation, or Roughness
- Engine - Tip-In Sag/Hesitation/Rough Idle
- Engine - Rough/Unstable/Incorrect Idle
- Fuels - Effect of Volatility on Driveability
- Engine, A/T - Shift/Driveability Concerns/MIL ON
- Fuel System - TOP TIER Detergent Gasoline
- Erratic Operation
- Erratic Shifting
- High emissions
- 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
- Fuel - Pump Replacement Caution, Strainer
- Oil Filter - Changing as a Result of Fouled Plugs
- MAP - Revised Check Chart for DTC's 33, 34, 63, 64
- Fuel Injectors - Remanufactured for TBI Systems
- Tools - Introduction Of The Fuel Injector Tester
- Fuel - Gasoline Brands That Clean Port Fuel Injectors
- ECM - Revised Replacement Procedure
- Engine Controls - ECM May Contain Wrong PROM
- ECM/PCM - Damaged and/or Misdiagnosed
- ECM - Packard 32 Way Connector Identification
- ECM/PCM - Damage Prevention
- Oxygen Sensors - Silica Contamination
- Engine Controls - Incorrect VSS Diagram
- Powermaster Brake System - Service Kits
- Engine - Surge After a Hot Soak
- Engine - High Ambient Cold Startability and Long Crank
- Fuel - Feed/Return Pipe Repair
- Fuel System - Cold Start Injector O-Ring Package
- ESC System - Functional Check Update
- Engine - Miss, Hesitation, or Roughness
- State Emissions Testing Information
- 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
- EVAP System - Service of Connectors
- Engine Controls - Electrostatic Discharge Damage
- Fuel System - Integrator/Block Learn Operation
- Engine Controls - Correction to Diagnostic Charts
- Electrical Terminals - Updated Procedure for Metric-pack
- Oxygen Sensor Test - Revised Tech 1 Mass Storage CD
- ECM Connectors - Metri-Pack Series 150 Terminal Removal
- Engine - Tip-In Sag/Hesitation/Rough Idle
- Engine - Rough/Unstable/Incorrect Idle
- PROM/MEMCAL - Identification Marks
- Fuels - Effect of Volatility on Driveability
- Fuel - How Fuel Economy Is Determined
- Idle Load Compensator (ILC) - Manual revision
- Electrical - Speed Sensor Buffer Connector Labeled Wrong
- Fuel - Reformulated/Oxygenated Gasolines
- Fuel - Use of Gasoline Containing 15 Percent MTBE
- 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
RENDER: 1.0x
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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.