Denso 3431 Spark Plug

Reliable Ignition Performance for Mitsubishi Vehicles

The Denso Iridium Long Life 3431 spark plug is engineered to provide consistent ignition and durability for select Mitsubishi models. Designed specifically for vehicles like the Mitsubishi Eclipse, Endeavor, Galant, and Lancer, this spark plug supports efficient combustion and engine responsiveness.

• Iridium center electrode tip for enhanced durability and ignition
• Platinum chip ground electrode tip for stable spark delivery
• Copper core center electrode for optimal conductivity
• Standard ground configuration with a single nickel ground electrode
• Pre-gap size of 0.8 mm for precise spark gap
• Flat seat type with 14 mm thread diameter and 19 mm reach
• Hex size of 16.0 mm for easy installation
• Manufacturer heat range rating of 20 for balanced heat dissipation
• Resistance of 5000 ohms to reduce electrical noise interference

About the Denso Iridium Long Life Product Line

The Iridium Long Life line from Denso focuses on delivering extended service life and reliable ignition performance. Utilizing iridium for the center electrode tip, these spark plugs offer improved wear resistance compared to conventional plugs. This product line is designed to maintain stable combustion characteristics over time, making it suitable for vehicles requiring consistent ignition quality, such as the Mitsubishi Eclipse and Lancer models.

Technical Details and Features

The Denso 3431 spark plug features a copper core center electrode that enhances electrical conductivity, ensuring efficient spark generation. The iridium tip on the center electrode provides a durable ignition point that withstands high temperatures and wear. The ground electrode incorporates a platinum chip tip and nickel core material, contributing to stable spark formation and longevity. With a pre-gap size of 0.8 mm and a flat seat design, this spark plug fits securely and maintains optimal spark gap for combustion efficiency. The 14 mm thread diameter and 19 mm reach are compatible with specific Mitsubishi engines, ensuring proper fitment and performance.

Applications and Problem Solving

• Restores engine misfire issues in Mitsubishi Eclipse and Galant models
• Improves cold start performance for Mitsubishi Endeavor vehicles
• Reduces ignition-related rough idling in Mitsubishi Lancer engines
• Enhances fuel efficiency by maintaining consistent spark delivery
• Minimizes electrical interference with 5000 ohm resistance

Installation Notes and Tips

When installing the Denso 3431 spark plug, ensure the pre-gap of 0.8 mm is maintained for optimal ignition. Use a 16 mm socket wrench to tighten the spark plug to the manufacturer’s recommended torque specifications. The flat seat design requires proper seating to avoid compression leaks. It is advisable to inspect the ignition system components for wear and replace spark plugs in sets to maintain balanced engine performance.

Quality Assurance and Warranty

Denso manufactures the 3431 spark plug to meet strict quality standards, ensuring reliable ignition performance and durability. The use of iridium and platinum materials contributes to extended service life. While specific warranty details may vary, Denso products typically come with manufacturer-backed quality assurance to support their performance claims.