Denso 3131 Spark Plug

Overview of Denso U-Groove Conventional Spark Plug 3131

The Denso U-Groove Conventional spark plug 3131 is engineered for reliable ignition performance in select Honda, Isuzu, Mazda, and Volkswagen vehicles. Designed with durable materials and precise specifications, this spark plug supports efficient combustion and consistent engine operation.

• Resistance: 5000 ohms for optimal electrical performance
• Ground Electrode Tip Design: Standard for reliable spark delivery
• Ground Electrode Core Material: Nickel for durability
• Center Electrode Core Material: Copper to enhance conductivity
• Center Electrode Tip Material: Nickel for wear resistance
• Pre-Gap Size: 1.1 mm for proper spark gap
• Ground Electrode Quantity: Single electrode design
• Hex Size: 16.0 mm for standard installation tools
• Manufacturer Heat Range: 16 suitable for specific engine requirements
• Seat Type: Flat for secure sealing
• Reach: 19.00 mm thread length
• Thread Diameter: 14.00 mm compatible with specified engines

About the U-Groove Conventional Product Line

The Denso U-Groove Conventional spark plug line features a unique groove design on the center electrode that improves ignition efficiency and combustion stability. This design helps maintain consistent spark performance while reducing fouling, making it suitable for a range of conventional ignition systems. The 3131 part number is part of this line, offering a balance of durability and performance for compatible vehicles.

Technical Details and Compatibility

This spark plug is compatible with various models including Honda Accord, Isuzu Oasis, Mazda Millenia and Protege, and Volkswagen Golf. The combination of a copper core center electrode and nickel tip ensures effective heat dissipation and longevity. The 1.1 mm pre-gap size and flat seat type contribute to proper fitment and sealing in engines requiring a 14 mm thread diameter and 19 mm reach.

Common Applications and Issues Addressed

• Replacement for worn or fouled spark plugs in Honda Accord and Mazda Protege
• Improves ignition stability in Volkswagen Golf and Isuzu Oasis engines
• Helps resolve misfires and rough idling in compatible vehicles
• Supports efficient fuel combustion to reduce emissions
• Addresses starting difficulties related to spark plug wear

Installation Notes and Tips

Ensure the engine is cool before installation. Use a 16 mm socket wrench to remove and install the spark plug. Verify the pre-gap size of 1.1 mm before installation to maintain optimal spark performance. Tighten the spark plug to manufacturer torque specifications to avoid damage to the flat seat and ensure proper sealing.

Quality Assurance and Warranty

Denso manufactures the U-Groove Conventional spark plug 3131 to meet OEM standards for ignition components. The use of nickel and copper materials supports durability and consistent performance. While specific warranty details may vary, Denso products typically come with a limited warranty covering defects in materials and workmanship.