Denso 4086 Spark Plug

Reliable Ignition with Denso U-Groove Conventional Spark Plug 4086

The Denso U-Groove Conventional Spark Plug 4086 is engineered to deliver consistent ignition performance for a variety of vehicles. Designed with a unique U-groove ground electrode tip and durable materials, this spark plug supports efficient combustion and engine reliability.

• U-groove ground electrode tip design for improved spark exposure
• Standard ground configuration with a single ground electrode
• Nickel ground electrode core and tip for durability
• Copper center electrode core with nickel tip for optimal conductivity
• Pre-gap size of 0.9 mm for precise spark gap
• Flat seat type with 19.00 mm reach and 12.00 mm thread diameter
• Hex size of 18.0 mm for standard installation tools
• Manufacturer heat range rating of 22 for balanced heat dissipation
• Resistance of 5000 ohms to reduce electrical noise interference

About the U-Groove Conventional Product Line

The Denso U-Groove Conventional spark plug line features a distinctive U-groove ground electrode tip designed to increase the spark exposure area. This design enhances ignition efficiency and combustion stability, making it suitable for conventional ignition systems. The 4086 part number is part of this line, offering a balance of durability and performance with nickel and copper electrode materials.

Technical Details and Performance

The Denso 4086 spark plug incorporates a copper core center electrode with a nickel tip, providing excellent thermal conductivity and wear resistance. The single nickel ground electrode with a U-groove tip improves spark exposure, which can contribute to more complete fuel combustion. With a pre-gap size of 0.9 mm and a flat seat design, this spark plug ensures a secure fit and consistent spark gap maintenance. The 19.00 mm reach and 12.00 mm thread diameter make it compatible with many vehicle engines requiring these specifications.

Common Applications and Problem Solving

• Restores engine misfire issues caused by worn or fouled spark plugs
• Improves cold start performance in vehicles with conventional ignition systems
• Reduces electrical interference with a 5000 ohm resistor built-in
• Helps maintain fuel efficiency by ensuring proper ignition timing
• Supports stable engine idling and smooth acceleration

Installation Notes and Tips

When installing the Denso 4086 spark plug, ensure the spark plug gap is set to the recommended 0.9 mm pre-gap size if adjustment is necessary. Use an 18 mm socket wrench for proper torque application. The flat seat design requires careful seating to avoid cross-threading. Always consult the vehicle’s service manual for specific torque specifications and fitment confirmation.

Quality Assurance and Warranty

Denso spark plugs, including the 4086 model, are manufactured to meet strict quality standards for durability and performance. The use of nickel and copper electrode materials ensures long service life under normal operating conditions. While specific warranty details are not provided, Denso products typically come with manufacturer-backed quality assurance to support reliable ignition system operation.