Infiniti QX4 1997-2003 3.5L V6 Engine Specifications
Explore the detailed technical specifications for the 3.5L V6 engine in the 1997-2003 Infiniti QX4. This guide covers performance metrics, dimensions, and operational parameters essential for maintenance, repair, and performance tuning.
Overview Specifications
This document provides detailed specifications and technical information about the 3.5L V6 engine used in the 1997-2003 Infiniti QX4. It covers key aspects such as engine performance, design features, maintenance tips, and troubleshooting guidelines. Use this guide to understand the engine's capabilities, maintain its performance, and address common issues. The information is organized into sections for easy navigation and quick reference.
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Browse through the sections to find detailed information. Each section is labeled with a title and description. Use the quick reference table at the end for key specifications.
Key Specifications
Horsepower
240 hp @ 6000 rpm
Torque
265 lb-ft @ 4000 rpm
Displacement
3.5 liters
Fuel Efficiency
16 mpg city / 21 mpg highway
Compression Ratio
10.0:1
Available Specifications
Engine Performance
This section covers the performance characteristics of the 3.5L V6 engine, including horsepower, torque, and fuel efficiency. Learn about the engine's capabilities and how it enhances the driving experience of the Infiniti QX4.
Engine Performance
This section covers the performance characteristics of the 3.5L V6 engine, including horsepower, torque, and fuel efficiency. Learn about the engine's capabilities and how it enhances the driving experience of the Infiniti QX4.
Power Output
- Horsepower: 240 hp @ 6000 rpm
- Torque: 265 lb-ft @ 4000 rpm
- Fuel efficiency: 16 mpg city / 21 mpg highway
- Compression ratio: 10.0:1
- Redline: 6500 rpm
Acceleration
- 0-60 mph: 7.5 seconds
- Quarter-mile: 15.8 seconds
- Top speed: 130 mph
- Throttle response: Immediate
Engine Design
Explore the design features of the 3.5L V6 engine, including its configuration, materials, and technologies. Understand how the engine's design contributes to its performance and reliability.
Engine Design
Explore the design features of the 3.5L V6 engine, including its configuration, materials, and technologies. Understand how the engine's design contributes to its performance and reliability.
Configuration
- Engine type: Naturally aspirated V6
- Displacement: 3.5 liters (3498 cc)
- Cylinder arrangement: 60-degree V
- Valvetrain: DOHC, 4 valves per cylinder
Materials
- Block material: Aluminum
- Cylinder head material: Aluminum
- Pistons: Forged aluminum
- Crankshaft: Forged steel
Maintenance and Care
This section provides tips and guidelines for maintaining the 3.5L V6 engine. Learn about recommended service intervals, common maintenance tasks, and best practices to ensure long-term reliability.
Maintenance and Care
This section provides tips and guidelines for maintaining the 3.5L V6 engine. Learn about recommended service intervals, common maintenance tasks, and best practices to ensure long-term reliability.
Service Intervals
- Oil change: Every 3,750 miles or 6 months
- Spark plugs: Every 30,000 miles
- Timing belt: Every 105,000 miles
- Coolant flush: Every 30,000 miles
Common Maintenance Tasks
- Check and replace air filter regularly
- Inspect and replace drive belts as needed
- Monitor engine oil level and quality
- Inspect and clean fuel injectors
Troubleshooting
Find solutions to common issues that may arise with the 3.5L V6 engine. This section includes diagnostic tips and potential fixes for problems such as rough idling, loss of power, and engine noise.
Troubleshooting
Find solutions to common issues that may arise with the 3.5L V6 engine. This section includes diagnostic tips and potential fixes for problems such as rough idling, loss of power, and engine noise.
Common Issues
- Rough idling: Check for vacuum leaks or dirty throttle body
- Loss of power: Inspect fuel system and spark plugs
- Engine noise: Check for loose components or worn timing belt
- Check engine light: Scan for diagnostic trouble codes
Diagnostic Tips
- Use OBD-II scanner to read codes
- Inspect ignition system for faults
- Check fuel pressure and injector function
- Inspect exhaust system for leaks
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Engine Specifications
Overview
- Type
- Gasoline V6
- Configuration
- 60-degree V6
- Displacement
- 3.5 liters (3498 cc)
- Cylinder Count
- 6
- Valvetrain
- DOHC, 4 valves per cylinder
- Location
- Front, longitudinal
Dimensions
- Length
- 24.8 in (630 mm)
- Width
- 26.4 in (670 mm)
- Height
- 27.6 in (701 mm)
- Weight
- 410 lbs (186 kg)
- Bore
- 3.56 in (90.5 mm)
- Stroke
- 3.66 in (93 mm)
- Cylinder Spacing
- 4.33 in (110 mm)
Materials
- Block
- Aluminum alloy
- Cylinder Heads
- 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
-
- Distributorless ignition
- Coil-on-plug design
- Electronic spark advance
- Cooling System
-
- Cross-flow aluminum radiator
- Electric cooling fan
- Thermostatic control
- Lubrication System
-
- Full-pressure system
- Oil-to-water cooler
- Replaceable spin-on filter
- Emissions Control
-
- EGR system
- Catalytic converter
- EVAP system
Safety Features
- Engine Protection
-
- Knock sensor system
- Low oil pressure warning
- Overheat protection
- Electronic Controls
-
- Engine control module (ECM)
- Fail-safe cooling mode
- Fail-safe limp-home mode
Comfort Features
- Vibration Control
-
- Counter-rotating balance shafts
- Hydraulic engine mounts
- Noise Reduction
-
- Acoustic engine cover
- Sound-deadening materials
Accessories
- Factory Options
-
- Heavy-duty cooling package
- Engine block heater
- Oil cooler kit
- Service Tools
-
- Special timing tools
- Valve adjustment tools
- Crankshaft holding tool
Maintenance
- Service interval
- 7,500 miles or 6 months
- Service Items
-
- Oil and filter change
- Spark plug replacement
- Timing belt inspection
- Valve clearance check
- Coolant flush
- Fuel filter replacement
- Maintenance Notes
- Use only specified 5W-30 synthetic oil
Warranty
- Basic
- Years: 4Miles: 60,000Coverage: Bumper to bumper
- Powertrain
- Years: 6Miles: 70,000Coverage: Engine and transmission
- Emissions
- Years: 8Miles: 80,000Coverage: Catalytic converter and sensors
- Corrosion
- Years: 7Miles: UnlimitedCoverage: Perforation only
Production Details
- Manufacturer
- Nissan Motor Corporation
- Manufacturing Process
-
- Casting for block and heads
- CNC machining
- Precision assembly
- Dyno testing
- Quality Control
- Dimensional Checks: 100% inspectionLeak Testing: Pressure and vacuumPerformance Testing: Dyno run-in
- Sustainability
-
- Recycled aluminum content
- Low-emission painting
- Waste reduction program
Service Information for 3.5L V6 Engine Service
Maintenance and service requirements for the 3.5L V6 engine
- Oil and filter change
- Tire rotation
- Fluid level checks
- Inspect belts and hoses
- Check battery condition
Use only manufacturer-approved fluids
- Replace air filter
- Inspect spark plugs
- Check fuel system
- Inspect exhaust system
- Test emissions system
May require special diagnostic tools
- Replace timing belt
- Replace water pump
- Replace all drive belts
- Flush cooling system
- Inspect valve clearance
Critical maintenance - do not delay
Common Questions
Find answers to common questions about torque specifications
Q1 Is the 3.5L V6 engine compatible with other Infiniti models?
Is the 3.5L V6 engine compatible with other Infiniti models?
The 3.5L V6 engine used in the 1997-2003 Infiniti QX4 is primarily designed for this model. While it shares similarities with engines in the Nissan Pathfinder and other Nissan/Infiniti vehicles, direct compatibility depends on specific configurations like mounting points, ECU, and transmission interfaces. Always verify with a professional or consult technical documentation before attempting cross-model installations.
Q2 What are the maintenance requirements for the 3.5L V6 engine?
What are the maintenance requirements for the 3.5L V6 engine?
Regular maintenance for the 3.5L V6 engine includes oil changes every 3,000-5,000 miles, air filter replacement every 15,000 miles, and spark plug replacement every 60,000 miles. Additionally, inspect the timing belt every 90,000 miles and replace it if necessary. Coolant flushes and transmission fluid changes should be performed as per the manufacturer’s schedule to ensure optimal engine performance.
Q3 How do I replace the 3.5L V6 engine in my Infiniti QX4?
How do I replace the 3.5L V6 engine in my Infiniti QX4?
To replace the 3.5L V6 engine, first, disconnect the battery and drain fluids. Remove components like the air intake, exhaust manifold, and accessories. Unbolt the transmission and engine mounts, then carefully lift the engine out using a hoist. Install the new engine by reversing the process, ensuring all connections are secure. Torque bolts to specifications and refill fluids. Professional assistance is recommended for this complex procedure.
Q4 What should I do if my 3.5L V6 engine is overheating?
What should I do if my 3.5L V6 engine is overheating?
If your 3.5L V6 engine is overheating, first check the coolant level and inspect for leaks. Ensure the radiator fan is functioning and the thermostat is not stuck. Clean any debris from the radiator fins. If the issue persists, inspect the water pump, head gasket, or cooling system for faults. Address these issues promptly to prevent engine damage.
Q5 How can I optimize the performance of my 3.5L V6 engine?
How can I optimize the performance of my 3.5L V6 engine?
To optimize performance, use high-quality synthetic oil and ensure regular maintenance. Upgrade the air intake and exhaust systems for better airflow. Consider a performance ECU tune for improved power and efficiency. Regularly check and replace worn components like spark plugs and ignition coils. Proper tire pressure and alignment also contribute to overall vehicle performance.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
1997-2003 Infiniti QX4 Service Manual
Coming SoonThis comprehensive manual covers all aspects of the QX4, including the 3.5L V6 engine, with detailed repair and maintenance instructions.
Technical Service Bulletin for 3.5L V6 Engine
Coming SoonThis bulletin addresses common issues and updates for the 3.5L V6 engine, including recommended fixes and improvements.
Infiniti QX4 Parts and Accessories Catalog
Coming SoonThis catalog provides a detailed list of OEM and aftermarket parts compatible with the 1997-2003 Infiniti QX4, including the 3.5L V6 engine.
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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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