Denso 4038 Spark Plug

Reliable Ignition with Denso U-Groove Conventional Spark Plug 4038

The Denso U-Groove Conventional Spark Plug 4038 is engineered to deliver consistent ignition performance for a variety of vehicles. Designed with a 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 0.7 mm for precise ignition timing
• Flat seat type ensuring proper sealing and fit
• Thread diameter of 14.00 mm and reach of 12.70 mm for compatibility
• Hex size of 20.6 mm for easy installation
• Manufacturer heat range of 24 suitable for moderate operating temperatures

About the Denso U-Groove Conventional Product Line

The U-Groove Conventional line by Denso focuses on spark plugs featuring a unique U-groove ground electrode tip design. This design enhances spark exposure to the air-fuel mixture, promoting more efficient combustion. The conventional construction balances performance and durability, making it suitable for a range of automotive applications requiring reliable secondary ignition components.

Technical Details and Performance

The Denso 4038 spark plug incorporates a nickel ground electrode core and tip, providing resistance to wear and corrosion. The copper center electrode core improves thermal conductivity, helping maintain stable operating temperatures. With a pre-gap size of 0.7 mm, this spark plug ensures consistent spark generation for smooth engine operation. The flat seat type and precise thread diameter of 14.00 mm allow for secure installation in compatible engines. The heat range rating of 24 indicates suitability for engines operating under moderate thermal conditions.

Applications and Problem Solving

• Restores proper ignition in vehicles experiencing misfires or rough idling
• Improves fuel efficiency by ensuring complete combustion
• Reduces engine hesitation during acceleration
• Helps maintain stable engine performance under varying loads
• Prevents fouling and electrode wear in compatible vehicle models

Installation Notes and Tips

When installing the Denso 4038 spark plug, ensure the pre-gap of 0.7 mm is maintained for optimal performance. Use a 20.6 mm socket for proper torque application. Verify compatibility with your vehicle’s thread diameter of 14.00 mm and reach of 12.70 mm to avoid installation issues. Always follow manufacturer torque specifications to prevent damage to the spark plug or cylinder head.

Quality Assurance and Warranty

Denso spark plugs, including the U-Groove Conventional 4038, are manufactured to meet strict quality standards for durability and performance. While specific warranty details may vary, Denso products typically come with manufacturer-backed warranties covering defects in materials and workmanship. Consult your vehicle’s service manual or Denso’s official documentation for warranty information related to this spark plug.