Denso 3371 Spark Plug

Reliable Ignition Performance for Acura, BMW, Ford, and More

The Denso Iridium Long Life 3371 spark plug is engineered to deliver consistent ignition and enhanced durability for a range of vehicles including Acura Accord, BMW 550i, Ford Ram 2500, and Honda Civic. Designed with advanced materials, this spark plug supports efficient combustion and long-term engine reliability.

• Iridium center electrode tip for improved ignition and longevity
• Platinum chip ground electrode tip for stable spark and wear resistance
• Copper core center electrode for optimal conductivity
• Standard ground configuration with nickel core ground electrode
• Pre-gapped to 0.8 mm for precise ignition timing
• Flat seat type with 14 mm thread diameter and 19 mm reach
• Hex size of 16 mm for easy installation
• Manufacturer heat range rating of 20 for balanced heat dissipation

Advanced Iridium Long Life Technology

The Iridium Long Life product line from Denso focuses on combining iridium and platinum materials to extend spark plug service intervals while maintaining reliable ignition performance. The iridium center electrode tip offers a fine wire design that reduces voltage requirements and improves fuel efficiency. The platinum chip on the ground electrode enhances electrode durability, making the Denso 3371 spark plug suitable for vehicles requiring long-lasting ignition components.

Technical Details and Compatibility

This spark plug features a copper core center electrode that ensures excellent thermal conductivity and stable spark generation. The nickel core ground electrode with a platinum chip tip provides resistance to wear and corrosion. With a pre-gap size of 0.8 mm and a flat seat design, the Denso 3371 is compatible with various models such as the Jeep Grand Cherokee, Mazda MX-6, Mitsubishi Raider, and Dodge Durango. The 14 mm thread diameter and 19 mm reach fit specific engine designs requiring these dimensions.

Common Applications and Problem Solving

• Restores engine misfire issues in Acura Accord and Honda CR-V
• Improves cold start performance in BMW 650i and 750Li
• Reduces rough idling in Ford Ram 3500 and Dodge Dakota
• Enhances fuel efficiency in Mazda MPV and Mitsubishi Millenia
• Maintains consistent spark for Jeep Liberty and Dodge Nitro

Installation Notes and Tips

Before installation, verify the spark plug gap is set to 0.8 mm as specified. Use a 16 mm socket wrench to tighten the spark plug to the manufacturer’s torque specifications. The flat seat design requires proper seating to avoid compression leaks. It is recommended to replace spark plugs in sets to maintain balanced engine performance. Compatible with vehicles including Acura, BMW, Dodge, Ford, Honda, Jeep, Mazda, and Mitsubishi models listed in the fitment.

Quality Assurance and Warranty

Denso manufactures the 3371 spark plug to meet OEM standards for ignition components. The use of iridium and platinum materials ensures durability and consistent performance over extended service intervals. While specific warranty details depend on the vehicle manufacturer or installer, Denso products typically come with quality assurance backed by rigorous testing and material standards.