Denso 4099 Spark Plug

Reliable Ignition Performance with Denso U-Groove Conventional Spark Plug

The Denso 4099 spark plug is engineered to deliver consistent ignition performance for a variety of vehicle applications. Featuring a U-groove ground electrode tip design, this spark plug supports efficient combustion and reliable engine starts.

• U-groove ground electrode tip 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 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 of 24 suitable for moderate engine temperatures

About the Denso U-Groove Conventional Product Line

The U-Groove Conventional line by Denso focuses on spark plugs with a unique U-shaped groove on the ground electrode tip. This design enhances spark exposure to the air-fuel mixture, promoting more efficient combustion. The conventional construction balances durability and performance, making it suitable for many gasoline engines requiring standard ignition components.

Technical Details and Specifications

The Denso 4099 spark plug features a nickel ground electrode core and tip, providing resistance to wear and corrosion. The copper center electrode core enhances thermal conductivity, helping maintain stable operating temperatures. With a pre-gap size of 0.7 mm, this spark plug ensures optimal spark gap for ignition efficiency. The flat seat design and 19.00 mm reach make it compatible with engines requiring this specific configuration. The thread diameter of 12.00 mm and hex size of 18.0 mm allow for straightforward installation using common tools.

Applications and Common Issues Addressed

• Restores proper ignition in engines experiencing misfires
• Improves cold start performance in compatible vehicles
• Reduces fouling caused by incomplete combustion
• Maintains consistent spark delivery under normal operating conditions
• Supports engine efficiency by ensuring correct spark gap and electrode design

Installation Notes and Tips

Before installation, verify compatibility with your vehicle’s make and model to ensure proper fitment. Use a torque wrench to tighten the spark plug to manufacturer specifications to avoid damage. Check the pre-gap size of 0.7 mm and adjust if necessary to match your engine requirements. The 18.0 mm hex size allows for installation with standard spark plug sockets.

Quality Assurance and Warranty

Denso spark plugs, including the 4099 model, are manufactured to meet strict quality standards for ignition components. The materials used, such as nickel and copper electrodes, are selected for durability and performance consistency. While specific warranty details may vary, Denso products typically come with manufacturer-backed quality assurance to support reliable operation.