Denso 4174 Spark Plug

Reliable Ignition Performance with Denso U-Groove Conventional Spark Plug

The Denso U-Groove Conventional Spark Plug part number 4174 is engineered to deliver consistent ignition performance for a variety of vehicle applications. Designed with durable materials and precise specifications, this spark plug supports efficient combustion and engine reliability.

• 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: 0.8 mm for precise spark gap
• Ground Electrode Quantity: Single electrode design
• Hex Size: 16.0 mm for standard installation tools
• Manufacturer Heat Range: 22 suitable for moderate engine temperatures
• Seat Type: Flat for secure sealing
• Reach: 19.00 mm to fit specific engine configurations
• Thread Diameter: 14.00 mm compatible with many ignition systems

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 electrode wear. The conventional construction with nickel and copper materials balances durability and conductivity, making it suitable for a range of gasoline engines requiring reliable secondary ignition components.

Technical Details and Application

The Denso 4174 spark plug is built with a copper core center electrode that enhances thermal conductivity, allowing for effective heat dissipation. The nickel ground and center electrode tips provide resistance to corrosion and wear, extending service life. With a resistance rating of 5000 ohms, this spark plug helps suppress electrical noise that can interfere with vehicle electronics. The flat seat and 14 mm thread diameter ensure compatibility with many vehicle makes and models, including common applications in Japanese and domestic cars requiring a 19 mm reach and heat range 22 spark plug.

Common Uses and Problem Solving

• Restores engine misfire issues caused by worn or fouled spark plugs
• Improves cold start performance and throttle response
• Reduces ignition system electrical interference with 5000 ohm resistance
• Maintains consistent combustion for smoother engine operation
• Prevents electrode wear and corrosion in moderate heat range engines

Installation Notes and Tips

Ensure the spark plug gap is set to the specified 0.8 mm pre-gap before installation. Use a 16 mm socket wrench for proper tightening torque to avoid damage to the flat seat. Verify thread compatibility with your vehicle’s cylinder head to prevent cross-threading. It is recommended to replace spark plugs in sets to maintain balanced engine performance.

Quality Assurance and Warranty

Denso spark plugs are manufactured to meet OEM specifications and undergo rigorous quality control testing. The U-Groove Conventional spark plug 4174 is designed for durability and consistent performance. Warranty coverage details should be confirmed with the vehicle manufacturer or parts distributor.