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.
1987 Chevrolet G 30 Van V8-305 5.0LFACTORY OEM SERVICE PROCEDURE
Repair and Diagnosis
- A L L Diagnostic Trouble Codes ( DTC )
- Relays and Modules
- Relays and Modules - Accessories and Optional Equipment
- Relays and Modules - Lighting and Horns
- Relays and Modules - Powertrain Management
- Relays and Modules - Steering and Suspension
- Relays and Modules - Transmission and Drivetrain
- Sensors and Switches
- Sensors and Switches - Cooling System
- Sensors and Switches - Cruise Control
- Sensors and Switches - Engine
- Sensors and Switches - HVAC
- Sensors and Switches - Instrument Panel
- Sensors and Switches - Lighting and Horns
- Sensors and Switches - Powertrain Management
- Sensors and Switches - Starting and Charging
- Sensors and Switches - Transmission and Drivetrain
- Sensors and Switches - Wiper and Washer Systems
- Maintenance
- Alignment
- Tune-up and Engine Performance Checks
- Fuel Pressure
- Air/Fuel Mixture
- Idle Speed
- Air Cleaner Housing
- Fuel Filter
- Firing Order
- Ignition Timing
- Ignition Cable
- Distributor
- Spark Plug
- Compression Check
- Valve Clearance
Service Precautions
Testing and Inspection- Initial Inspection and Diagnostic Overview
- Symptom Related Diagnostic Procedures
- Cranks, Won't Start
- Engine Backfires
- Engine Diesels, Runs After Shutoff
- Engine Pings or Knocks
- Engine Runs Rough, Misses
- Engine Starts, Then Dies
- Engine Stumbles or Hesitates on Acceleration
- Engine Surges
- Hard Starting, Excessive Cranking
- Idle Speed Problems
- Poor Acceleration, Lack of Power
- Ready Made Hyperlinks
- Service Engine Soon
Service and Repair
Technical Service Bulletins
Tools and Equipment
- Drive Belt
- Filters
- Hoses
- Fluids
- Brake Bleeding
- Fuses and Circuit Breakers
- Service Reminder Indicators
- Wheels and Tires
- Application and ID
- Service Intervals
- Severe Service Defined
- Routine Service
- Normal Service
- 6000 MI or 9600 KM
- 12000 MI or 19200 KM
- 18000 MI or 28800 KM
- 24000 MI or 38400 KM
- 30000 MI or 48000 KM
- 36000 MI or 57600 KM
- 42000 MI or 67200 KM
- 48000 MI or 76800 KM
- 54000 MI or 86400 KM
- 60000 MI or 96000 KM
- 66000 MI or 105600 KM
- 72000 MI or 115200 KM
- 78000 MI or 124800 KM
- 84000 MI or 134400 KM
- 90000 MI or 144000 KM
- 96000 MI or 153600 KM
- 102000 MI or 163200 KM
- 108000 MI or 172800 KM
- 114000 MI or 182400 KM
- 120000 MI or 192000 KM
- Severe Service
- 3000 MI or 4800 KM
- 6000 MI or 9600 KM
- 9000 MI or 14400 KM
- 12000 MI or 19200 KM
- 15000 MI or 24000 KM
- 18000 MI or 28800 KM
- 21000 MI or 33600 KM
- 24000 MI or 38400 KM
- 27000 MI or 43200 KM
- 30000 MI or 48000 KM
- 33000 MI or 52800 KM
- 36000 MI or 57600 KM
- 39000 MI or 62400 KM
- 42000 MI or 67200 KM
- 45000 MI or 72000 KM
- 48000 MI or 76800 KM
- 51000 MI or 81600 KM
- 54000 MI or 86400 KM
- 57000 MI or 91200 KM
- 60000 MI or 96000 KM
- 63000 MI or 100800 KM
- 66000 MI or 105600 KM
- 69000 MI or 110400 KM
- 72000 MI or 115200 KM
- 75000 MI or 120000 KM
- 78000 MI or 124800 KM
- 81000 MI or 129600 KM
- 84000 MI or 134400 KM
- 87000 MI or 139200 KM
- 90000 MI or 144000 KM
- 93000 MI or 148800 KM
- 96000 MI or 153600 KM
- 99000 MI or 158400 KM
- 102000 MI or 163200 KM
- 105000 MI or 168000 KM
- 108000 MI or 172800 KM
- 111000 MI or 177600 KM
- 114000 MI or 182400 KM
- 117000 MI or 187200 KM
- 120000 MI or 192000 KM
- Service and Repair
Specifications- Technical Service Bulletins
- Engine, Cooling and Exhaust
- Engine
- Compression Check
- Camshaft, Lifters and Push Rods
- Cylinder Block Assembly
- Cylinder Head Assembly
- Drive Belts, Mounts, Brackets and Accessories
- Engine Lubrication
- Intake Manifold
- Lamps and Indicators - Engine
- Seals and Gaskets
- Sensors and Switches - Engine
- Timing Components
- Tune-up and Engine Performance Checks
- Fuel Pressure
- Air/Fuel Mixture
- Idle Speed
- Air Cleaner Housing
- Fuel Filter
- Firing Order
- Ignition Timing
- Ignition Cable
- Distributor
- Spark Plug
- Compression Check
- Valve Clearance
- Service Precautions
- Testing and Inspection
- Initial Inspection and Diagnostic Overview
- Symptom Related Diagnostic Procedures
- Cranks, Won't Start
- Engine Backfires
- Engine Diesels, Runs After Shutoff
- Engine Pings or Knocks
- Engine Runs Rough, Misses
- Engine Starts, Then Dies
- Engine Stumbles or Hesitates on Acceleration
- Engine Surges
- Hard Starting, Excessive Cranking
- Idle Speed Problems
- Poor Acceleration, Lack of Power
- Ready Made Hyperlinks
- Service Engine Soon
- Service and Repair
- Technical Service Bulletins
- Tools and Equipment
- Water Pump
- Testing and Inspection
Locations- Service and Repair
- Specifications
- Technical Service Bulletins
- Tools and Equipment
- Cooling System
- Coolant
- Coolant Level Indicator Lamp
- Radiator Cooling Fan
- Engine - Coolant Temperature Sensor/Switch
- Heater Core
- Lamps and Indicators - Cooling System
- Radiator
- Radiator Cap
- Sensors and Switches - Cooling System
- Temperature Warning Lamp/Indicator
- Thermostat
- Water Pump
- Service Precautions
- Testing and Inspection
- Service and Repair
- Specifications
- Technical Service Bulletins
- Tools and Equipment
- Fundamentals and Basics
- Exhaust System
- Technical Service Bulletins
- Engine
- Powertrain Management
- Relays and Modules - Powertrain Management
- Sensors and Switches - Powertrain Management
- Tune-up and Engine Performance Checks
- Fuel Pressure
- Air/Fuel Mixture
- Idle Speed
- Air Cleaner Housing
- Fuel Filter
- Firing Order
- Ignition Timing
- Ignition Cable
- Distributor
- Spark Plug
- Compression Check
- Valve Clearance
- Service Precautions
- Testing and Inspection
- Initial Inspection and Diagnostic Overview
- Symptom Related Diagnostic Procedures
- Cranks, Won't Start
- Engine Backfires
- Engine Diesels, Runs After Shutoff
- Engine Pings or Knocks
- Engine Runs Rough, Misses
- Engine Starts, Then Dies
- Engine Stumbles or Hesitates on Acceleration
- Engine Surges
- Hard Starting, Excessive Cranking
- Idle Speed Problems
- Poor Acceleration, Lack of Power
- Ready Made Hyperlinks
- Service Engine Soon
- Service and Repair
- Technical Service Bulletins
- Tools and Equipment
- Computers and Control Systems
- Air Temperature Sensor ( Ambient / Intake )
- Barometric Pressure Sensor
- Coolant Temperature Sensor/Switch (For Computer)
- Cranking Signal
- Data Link Connector
- Electronic Spark Control Module
- Electronic Throttle Actuator
- Engine Control Module
- Idle Speed/Throttle Actuator - Electronic
- Idle/Throttle Speed Control Unit
- Knock Sensor
- Malfunction Indicator Lamp
- Manifold Pressure/Vacuum Sensor
- Memory Calibration Unit
- Mixture Control Solenoid
- Oil Pressure Sensor
- Oxygen Sensor
- Relays and Modules - Computers and Control Systems
- Sensors and Switches - Computers and Control Systems
- Shift Light
- Throttle Position Sensor
- Transmission Position Sensor/Switch
- Vehicle Speed Sensor
- Vehicle Speed Sensor Signal Buffer
- Service Precautions
Description and Operation- Testing and Inspection
- Initial Inspection and Diagnostic Overview
- Reading and Clearing Diagnostic Trouble Codes
- Symptom Related Diagnostic Procedures
- Component Tests and General Diagnostics
- Scan Tool Testing and Procedures
- Description and Use
- Limitations
- Mode Description
- Positions
- A/C Request - A/C Clutch
- BARO - Barometric Pressure
- Batt - AD Bat
- BLM - Block Learn Memory Cell
- BPW - Base Pulse Width
- CCP - Canister Purge
- Coolant Temperature
- Crossover Counts (Numeric Display)
- Desired RPM
- EGR Position
- EGR Signal
- Exhaust
- Fan
- Fan Request
- IAC - Idle Air Control
- Ignition/Crank - Ignition Switch Status
- Injector Pulse Width
- Int - Integrator & BLM-Block Learn Memory
- Knock Retard
- Knock Signal
- Loop Status (O/L - C/L)
- MAP - Manifold Absolute Pressure
- MAT - Manifold Air Temperature
- MPH/VSS
- O2 Sensor Voltage
- Park/Neutral Switch
- Power Steering Pressure Switch
- PPSW - Pump Pressure Switch
- RPM - Engine Speed
- Spark Advance
- TCC - Torque Converter Clutch
- Throttle Angle
- TPS - Throttle Position Sensor Voltage
- Transmission/Transaxle Gear Position Switch
- Trouble Codes
- VAC - Vacuum (Differential Pressure) Sensor
- WOT - Wide Open Throttle Switch
- Scan Tool Data List
Adjustments
Diagrams- Specifications
- Technical Service Bulletins
- Emission Control Systems
- Fuel Delivery and Air Induction
- Fuel Pressure
- Fuel Pressure Release
- Idle Speed
- Air/Fuel Mixture
- Air Cleaner Housing
- Carburetor
- Cold Start Injector
- Fuel
- Fuel Filler Cap
- Fuel Filter
- Fuel Injector
- Fuel Pressure Test Port
- Fuel Pump
- Fuel Return Line
- Fuel Supply Line
- Fuel Tank
- Idle Speed/Throttle Actuator - Electronic
- Idle/Throttle Speed Control Unit
- Relays and Modules - Fuel Delivery and Air Induction
- Sensors and Switches - Fuel Delivery and Air Induction
- Throttle Body
- Throttle Position Sensor
- Turbocharger
- Service Precautions
- Adjustments
- Service and Repair
- Diagrams
- Specifications
- Technical Service Bulletins
- Tools and Equipment
- Ignition System
- Firing Order
- Ignition Timing
- Distributor
- Electronic Spark Control Module
- Ignition Cable
- Ignition Coil
- Ignition Control Module
- Ignition Timing Connector
- Knock Sensor
- Pick-Up Coil
- Pole Piece / Reluctor Wheel
- Relays and Modules - Ignition System
- Sensors and Switches - Ignition System
- Spark Plug
- Description and Operation
- Service and Repair
- Technical Service Bulletins
- Transmission Control Systems
- PROM - Programmable Read Only Memory
- Service Precautions
- Application and ID
- Locations
- Diagrams
- Technical Service Bulletins
- Transmission and Drivetrain
- Actuators and Solenoids - Transmission and Drivetrain
- Automatic Transmission/Transaxle
- Actuators and Solenoids - A/T
- Accumulator
- Band
- Band Apply Servo
- Bell Housing
- Case
- Clutch
- Fluid - A/T
- Fluid Filter - A/T
- Fluid Pan
- Fluid Pressure Sensor/Switch
- Fluid Pump
- Governor
- Lamps and Indicators - A/T
- Maintenance Indicator - A/T
- Output Shaft
- Output Shaft Bearing/Bushing
- Relays and Modules - A/T
- Seals and Gaskets
- Sensors and Switches - A/T
- Shift Interlock
- Shifter A/T
- Shift Linkage
- Shift Solenoid Relay
- Speedometer Gear, A/T
- Throttle Valve Assembly
- Throttle Valve Cable/Linkage
- Torque Converter
- Torque Converter Clutch
- Torque Converter Clutch Solenoid
- Transmission Cooler
- Transmission Position Sensor/Switch
- Transmission Pressure Test Port
- Turbine Shaft
- Valve Body
- Application and ID
- Description and Operation
- Testing and Inspection
- Initial Inspection and Diagnostic Overview
- Symptom Related Diagnostic Procedures
- Converter Clutch Does Not Release
- Converter Shudder
- Drives In Neutral
- High or Low Shift Points
- No Overrun Braking-Manual 3-2-1
- No Park
- No Part Throttle or Delayed Downshifts
- No Reverse or Slips In Reverse
- No Torque Converter Clutch Apply
- No 2-3 Shift or 2-3 Shift Shift Slipping, Rough or Hunting
- No 3-4 Shift or Rough 3-4 Shift
- Oil Out of the Vent
- Oil Pressure High or Low
- Ratcheting Noise
- Second Gear Start In Drive Range
- Slips In 1ST Gear
- Vibration In Reverse & Whining Noise In Park
- 1-2 Shift Slipping or Rough
- 1-2 Shift Speed - High or Low
- 1ST Gear Range Only - No Upshift
- Component Tests and General Diagnostics
- Locations
- Service and Repair
- Procedures
- Removal and Replacement
- Overhaul
- 4L60/4L60-E (700-R4) Automatic Transmission
- 700-R4 Automatic Transmission
- Disassemble
- Subassembly Service
- Case & Internal Components
- Case Assembly Inspection
- Check Valve Retainer & Ball Assembly
- Clutch Air Check
- Forward Clutch Sprag Assembly
- Inner Manual Linkage
- Input Carrier & Sun Gear
- Input Clutch Assembly
- 700-R4 Transmission
- Low & Reverse Clutch Assembly
- Low/Reverse Support Assembly
- Oil Pump Cover & Body Assembly
- Oil Pump Cover Assembly
- Oil Pump Cover Disassemble
- Parking Pawl
- Pump Body Assembly
- Pump Body Disassembly
- Reaction Internal Gear & Carrier Assembly Inspection
- Reaction Internal Gear & Support
- Reaction Sun Gear & Shell
- Reverse Input & Input Clutches
- Reverse Input Clutch Assembly
- Third Accumulator Retainer & Ball Assembly
- Transmission Endplay Check
- 2-4 Band Assembly
- 3-4 Clutch Piston Travel Check
- External Components
- Case & Internal Components
- Diagrams
- Specifications
- Technical Service Bulletins
- Clutch
- Continuously Variable Transmission/Transaxle
- Differential Assembly
- Differential Carrier
- Differential Clutch
- Differential Axle Housing
- Fluid - Differential
- Pinion Bearing
- Pinion Gear
- Application and ID
- Specifications
- Technical Service Bulletins
- Drive Axles, Bearings and Joints
- Drive/Propeller Shafts, Bearings and Joints
- Flywheel
- Lamps and Indicators - Transmission and Drivetrain
- Manual Transmission/Transaxle
- Bell Housing
- Case
- Counter Gear
- Countershaft
- Extension Housing
- Fluid - M/T
- Mainshaft Bearing/Bushing
- Mainshaft
- Reverse Idler Gear
- Shift Linkage
- Speedometer Gear, M/T
- Transmission Mount
- Service and Repair
- Diagrams
- Specifications
- Technical Service Bulletins
- Relays and Modules - Transmission and Drivetrain
- Sensors and Switches - Transmission and Drivetrain
- Transfer Case
- Transmission Control Systems
- Diagrams
- Specifications
- Technical Service Bulletins
- Brakes and Traction Control
- Antilock Brakes / Traction Control Systems
- Brake Bleeding
- Brake Warning Indicator
- Disc Brake System
- Drum Brake System
- Hydraulic System
- Parking Brake System
- Power Brake Assist
- Service Precautions
- Testing and Inspection
- Service and Repair
- Technical Service Bulletins
- Starting and Charging
- Sensors and Switches - Starting and Charging
- Battery
- Charging System
- Starting System
- Power and Ground Distribution
- Testing and Inspection
- Diagrams
- Specifications
- Technical Service Bulletins
- Power and Ground Distribution
- Steering and Suspension
- Alignment
- Relays and Modules - Steering and Suspension
- Steering
- Suspension
- Wheels and Tires
- Specifications
- Technical Service Bulletins
- Heating and Air Conditioning
- Accumulator HVAC
- Air Conditioning Switch
- Air Door
- Air Duct
- Blower Motor
- Blower Motor Switch
- Compressor HVAC
- Compressor Clutch
- Compressor Clutch Coil
- Compressor Pulley
- Compressor Shaft Seal
- Testing and Inspection
- Service and Repair
- Compressor Replacement
- Delco Air A-6 Axial Compressor
- Delco Air DA-6 & HR-6 Compressor
- Delco Air R-4 Radial Compressor
- Diagrams
- Technical Service Bulletins
- Compressor Clutch Diode HVAC
- Condenser HVAC
- Control Assembly
- Evaporator Core
- Expansion Block/Orifice Tube
- Expansion Valve
- Heater Core
- Hose/Line HVAC
- Refrigerant
- Refrigerant Oil
- Sensors and Switches - HVAC
- Service Port HVAC
- Vacuum Reservoir HVAC
- Service Precautions
- Testing and Inspection
- Service and Repair
- Diagrams
- Specifications
- Technical Service Bulletins
- Restraints and Safety Systems
- Accessories and Optional Equipment
- Body and Frame
- Cruise Control
- Instrument Panel, Gauges and Warning Indicators
- Ammeter Gauge
- Brake Warning Indicator
- Charge Lamp/Indicator
- Clock
- Coolant Level Indicator Lamp
- Dashboard / Instrument Panel
- Dimmer Switch
- Fuel Gauge
- Fuel Gauge Sender
- Instrument Cluster / Carrier
- Maintenance Indicator - A/T
- Malfunction Indicator Lamp
- Odometer
- Oil Pressure Sender
- Oil Pressure Warning Lamp/Indicator
- Sensors and Switches - Instrument Panel
- Speedometer Head
- Temperature Warning Lamp/Indicator
- Tire Monitoring System
- Transmission Shift Position Indicator Lamp
- Vacuum Gauge/Economy Meter
- Volt Meter Gauge
- Water In Fuel Indicator
- Description and Operation
- Service and Repair
- Technical Service Bulletins
- Lighting and Horns
- Windows and Glass
- Wiper and Washer Systems
- Sensors and Switches - Wiper and Washer Systems
- Wiper Blade
- Wiper Gear Box
- Wiper Motor
- Wiper Switch
- Description and Operation
- Testing and Inspection
- Chart 1 Washer Pump Inoperative
- Chart 2 Wipers Low Speed Inoperative
- Chart 3 High Speed Only, Inoperative In Low
- Chart 4 Low Speed, Pulse Delay, and Mist Modes INOP
- Chart 5 Wipers Will Not Park
- Chart 6 Wiper Will Not Shut Off
- Chart 7 Intermittent Operation, Wiper Has Both Speeds
- Chart 8 Wiper Runs But Blades Don't Move
- Diagrams
- Technical Service Bulletins
- Application and ID
- Truck Body Identification
- Regular Production Option (RPO)
- Vehicle Identification Number (VIN)
- Description
- GM Automobile VIN Charts
- GM Light Duty & Multi-Purpose Truck VIN Charts
- 1982 Light Duty Trucks & Multi-Purpose Vehicle
- 1983 Light Duty Trucks & Multi-Purpose Vehicle
- 1984 Light Duty Trucks & Multi-Purpose Vehicle
- 1985 Light Duty Trucks & Multi-Purpose Vehicle
- 1986 Light Duty Trucks & Multi-Purpose Vehicle
- 1987 Light Duty Trucks & Multi-Purpose Vehicle
- 1988 Light Duty Trucks & Multi-Purpose Vehicle
- 1989 Light Duty Trucks & Multi-Purpose Vehicle
- 1990 Light Duty Trucks & Multi-Purpose Vehicles
- 1991 Light Duty Trucks & Multi-Purpose Vehicles
- 1992 Light Duty Trucks & Multi-Purpose Vehicles
- 1993 Light Duty Trucks & Multi-Purpose Vehicles
- 1994 Light Duty Trucks & Multi-Purpose Vehicles
- 1995 Light Duty Trucks & Multi-Purpose Vehicles
- 1996 Light Duty Trucks & Multi-Purpose Vehicles
- GM Medium & Heavy Duty Truck VIN Charts
- 1982 Medium & Heavy Duty Trucks
- 1983 Medium & Heavy Duty Trucks
- 1984 Medium & Heavy Duty Trucks
- 1985 Medium & Heavy Duty Trucks
- 1986 Medium & Heavy Duty Trucks
- 1987 Medium & Heavy Duty Trucks
- 1988 Medium & Heavy Duty Trucks
- 1989 Medium & Heavy Duty Trucks
- 1990 Medium & Heavy Duty Trucks
- 1991 Medium & Heavy Duty Trucks
- 1992 Medium & Heavy Duty Trucks
- 1993 Medium & Heavy Duty Trucks
- 1994 Medium & Heavy Duty Trucks
- Locations
- Diagrams
- Diagram Information and Instructions
- Exploded Views
- Connector Views
- Electrical Diagrams
- Fluid Diagrams
- Vacuum and Vapor Hose Diagrams
- Components
- Fuse and Fusible Links
- Specifications
- Electrical Specifications
- Mechanical Specifications
- Backing Plate
- Brake Drum
- Brake Master Cylinder
- Brake Rotor/Disc
- Compressor Clutch
- Distributor, Ignition
- Engine
- System Specifications
- Camshaft, Lifters and Push Rods
- Cylinder Block Assembly
- Cylinder Head Assembly
- Drive Belt
- Engine Mount
- Intake Manifold
- Oil Pan, Engine
- Oil Pressure Sensor
- Oil Pump, Engine
- Rear Crankshaft Main Bearing Seal
- Timing Cover
- Exhaust Manifold
- Fan Blade
- Fan Clutch
- Firing Order
- Fuel Delivery and Air Induction
- Spark Plug
- Starting and Charging
- Steering and Suspension
- Thermostat, Engine Cooling
- Transmission and Drivetrain
- System Specifications
- Automatic Transmission/Transaxle
- Clutch Master Cylinder
- Clutch Slave Cylinder
- Differential Assembly
- Flywheel
- Manual Transmission/Transaxle
- Universal Joint, Drive/Propeller Shaft
- Water Pump
- Wheel Cylinder
- Pressure, Vacuum and Temperature Specifications
- Capacity Specifications
- Fluid Type Specifications
- Technical Service Bulletins
Diagnostic Trouble Codes
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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