GMC Envoy 2002-2009 4.2L Engine Specifications
Explore detailed technical specifications for the 4.2L inline-6 engine in the 2002-2009 GMC Envoy. This guide covers displacement, horsepower, torque, fuel system, and maintenance intervals, providing essential information for maintenance, repairs, and upgrades.
Overview Specifications
This document provides detailed specifications and technical information about the 4.2L engine used in the 2002-2009 GMC Envoy. It is designed to assist users in understanding the engine's features, performance, and maintenance requirements. The content is organized into sections for easy navigation, and a quick reference table is included for key specifications.
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Navigate through the document by scrolling through the sections or using the table of contents. Each section is labeled with a title and description, making it easy to find the information you need.
Key Specifications
Displacement
4.2L
Horsepower
275 hp
Torque
275 lb-ft
Fuel Efficiency
17 MPG (combined)
Cylinder Configuration
Inline-6
Available Specifications
Engine Performance
This section covers the performance characteristics of the 4.2L engine, including horsepower, torque, and fuel efficiency. It also provides details on how the engine's design contributes to its overall performance.
Engine Performance
This section covers the performance characteristics of the 4.2L engine, including horsepower, torque, and fuel efficiency. It also provides details on how the engine's design contributes to its overall performance.
Horsepower and Torque
- Horsepower: 275 hp at 6000 rpm
- Torque: 275 lb-ft at 3600 rpm
- Peak power achieved at high RPMs
- Smooth power delivery across the RPM range
Fuel Efficiency
- City MPG: 15
- Highway MPG: 20
- Combined MPG: 17
- Designed for balanced performance and efficiency
Engine Design
This section delves into the design features of the 4.2L engine, including its inline-6 configuration, materials used, and advanced technologies that enhance its performance and durability.
Engine Design
This section delves into the design features of the 4.2L engine, including its inline-6 configuration, materials used, and advanced technologies that enhance its performance and durability.
Inline-6 Configuration
- Inline-6 cylinder layout for smooth operation
- Dual overhead camshafts (DOHC)
- 24-valve design for improved airflow
- Aluminum cylinder heads for reduced weight
Advanced Technologies
- Variable valve timing (VVT)
- Electronic throttle control
- Coil-on-plug ignition system
- Integrated exhaust manifold
Maintenance and Durability
This section provides information on the maintenance requirements and durability features of the 4.2L engine. It includes details on recommended service intervals and common maintenance tasks.
Maintenance and Durability
This section provides information on the maintenance requirements and durability features of the 4.2L engine. It includes details on recommended service intervals and common maintenance tasks.
Recommended Service Intervals
- Oil change every 5,000 miles
- Spark plug replacement every 100,000 miles
- Timing chain inspection every 60,000 miles
- Air filter replacement every 30,000 miles
Durability Features
- Forged steel crankshaft
- High-strength aluminum block
- Thermal management system
- Long-life coolant
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Engine Specifications
Overview
- Type
- Inline 6-cylinder
- Configuration
- Naturally aspirated
- Platform
- GM Atlas engine family
- Material
- Aluminum block and heads
- Location
- Front, longitudinal
Dimensions
- Length
- 24.5 inches (622 mm)
- Width
- 28.3 inches (719 mm)
- Height
- 27.6 inches (701 mm)
- Weight
- 385 lbs (175 kg)
- Displacement
- 256 cubic inches (4192 cc)
- Bore
- 3.94 inches (100 mm)
- Stroke
- 3.46 inches (88 mm)
- Compression Ratio
- 10.0:1
Materials
- Engine Block
- Aluminum alloy with cast iron liners
- Cylinder Head
- Aluminum alloy
- Pistons
- Forged aluminum
- Crankshaft
- Forged steel
- Valves
- Stainless steel
Features
- Fuel System
-
- Sequential multi-port fuel injection
- Electronic throttle control
- Returnless fuel system
- Ignition System
-
- Coil-on-plug ignition
- Waste spark system
- Integrated knock control
- Cooling System
-
- Cross-flow aluminum radiator
- Electric cooling fan
- Thermostatically controlled
- Lubrication System
-
- Full-pressure lubrication
- Oil cooler
- High-capacity oil pump
- Emissions Control
-
- EGR system
- Catalytic converter
- OBD-II compliant
Safety Features
- Engine Protection
-
- Low oil pressure shutdown
- Overheat protection
- Knock sensor system
- Emissions Safety
-
- Evaporative emissions control
- Secondary air injection
Comfort Features
- Noise Reduction
-
- Acoustic engine cover
- Hydraulic engine mounts
- Tuned intake manifold
- Vibration Control
-
- Balanced crankshaft
- Dual-mass flywheel
- Isolated fuel rail
Accessories
- Engine Bay
-
- High-output alternator
- Power steering pump
- A/C compressor
- Cooling System
-
- Electric cooling fan
- Radiator shroud
- Coolant reservoir
- Ignition System
-
- Ignition coils
- Spark plug wires
- Distributor-less ignition
Maintenance
- Service interval
- Every 7,500 miles or 6 months
- Service Items
-
- Oil and filter change
- Spark plug replacement
- Air filter inspection
- Coolant flush
- Timing chain inspection
- Maintenance Notes
- Use synthetic 5W-30 oil for optimal performance
Warranty
- Basic Warranty
- Miles: 36,000Years: 3Coverage: Bumper-to-bumper
- Powertrain Warranty
- Miles: 60,000Years: 5Coverage: Engine and transmission
- Emissions Warranty
- Miles: 80,000Years: 8Coverage: Catalytic converter and ECU
- Corrosion Warranty
- Miles: 100,000Years: 6Coverage: Perforation only
Production Details
- Manufacturer
- General Motors
- Manufacturing Process
-
- Casting of aluminum block
- CNC machining of cylinder heads
- Assembly line integration
- Quality Control
- inspection: 100% engine testingTolerance: Precision machining within 0.001 inches
- Sustainability Practices
-
- Recycled aluminum usage
- Low-emission manufacturing
- Energy-efficient assembly
- Production Metrics
- Units Per Day: 500Defect Rate: 0.1%Energy Usage: 15 kWh per engine
Service Information for 4.2l engine Service
Maintenance and service requirements specific to this component
- Oil and filter change
- Inspect air filter
- Check coolant level
- Inspect belts and hoses
- Check ignition system
Use only synthetic 5W-30 oil
- Replace spark plugs
- Inspect timing chain
- Check fuel system pressure
- Inspect exhaust system
- Test emissions system
Requires specialized diagnostic tools
- Replace timing chain
- Flush cooling system
- Replace water pump
- Inspect valve clearance
- Perform compression test
Major service requiring engine disassembly
Common Questions
Find answers to common questions about torque specifications
Q1 Is the 4.2L engine compatible with other GMC models from 2002-2009?
Is the 4.2L engine compatible with other GMC models from 2002-2009?
The 4.2L inline-6 engine used in the 2002-2009 GMC Envoy is specifically designed for this model and its platform siblings, such as the Chevrolet TrailBlazer and Oldsmobile Bravada. While it shares some components with other GM engines, direct compatibility with non-platform vehicles is limited. Always verify part numbers and consult a service manual before attempting cross-model installations.
Q2 What are the maintenance requirements for the 4.2L engine?
What are the maintenance requirements for the 4.2L engine?
The 4.2L engine requires regular maintenance to ensure optimal performance. Key tasks include oil changes every 5,000-7,500 miles, air filter replacement every 15,000 miles, and spark plug replacement every 100,000 miles. Additionally, inspect the timing chain and tensioner at 150,000 miles. Use only recommended fluids and filters to avoid premature wear or damage.
Q3 How do I replace the 4.2L engine in a GMC Envoy?
How do I replace the 4.2L engine in a GMC Envoy?
Replacing the 4.2L engine involves several steps: disconnect the battery, drain fluids, and remove components like the intake manifold, exhaust system, and accessories. Use an engine hoist to lift the engine out. Install the new engine by reversing the process, ensuring proper torque specifications for all bolts. Refer to the service manual for detailed instructions and safety precautions.
Q4 What are common troubleshooting steps for the 4.2L engine?
What are common troubleshooting steps for the 4.2L engine?
Common issues with the 4.2L engine include rough idling, reduced power, and oil leaks. Start by checking for diagnostic trouble codes (DTCs) using an OBD-II scanner. Inspect the ignition system, fuel injectors, and vacuum lines for wear or damage. Address oil leaks by replacing gaskets or seals. If the problem persists, consult a professional mechanic.
Q5 How can I optimize the performance of the 4.2L engine?
How can I optimize the performance of the 4.2L engine?
To optimize performance, use high-quality synthetic oil and premium fuel. Upgrade the air intake and exhaust systems for better airflow. Regularly clean the throttle body and replace worn spark plugs. Consider a performance tune to adjust the engine's ECU settings. Avoid aggressive driving to reduce wear and maintain fuel efficiency.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
2002-2009 GMC Envoy Service Manual
Coming SoonComprehensive guide covering maintenance, repair, and troubleshooting for the 4.2L engine and other vehicle systems.
Technical Service Bulletin: 4.2L Engine Oil Leak
Coming SoonDetails common oil leak issues and recommended repair procedures for the 4.2L engine.
GMC Envoy Parts and Accessories Catalog
Coming SoonCatalog listing OEM and aftermarket parts for the 2002-2009 GMC Envoy, including engine components.
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Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.
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