Denso 3191 Spark Plug

Reliable Ignition Performance for Select Vehicle Models

The Denso 3191 spark plug from the U-Groove Conventional line offers dependable ignition for a variety of vehicles including Bentley, Chrysler, Dodge, Hyundai, INFINITI, Jeep, Kia, Land Rover, Mercedes-Benz, Nissan, Toyota, and Volkswagen models. Designed to meet specific engine requirements, this spark plug ensures consistent combustion and engine efficiency.

• U-groove ground electrode tip design for improved ignition
• 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 0.8 mm for precise spark gap
• 16 mm hex size and 14 mm thread diameter for proper fitment
• Flat seat type and 19 mm reach for secure installation
• Manufacturer heat range of 16 suitable for various engine conditions
• Resistance rating of 5000 ohms to reduce electrical noise

About the Denso U-Groove Conventional Spark Plug Line

The U-Groove Conventional spark plug line by Denso features a unique U-shaped groove on the ground electrode tip, which enhances spark exposure and combustion efficiency. This design supports stable ignition and improved fuel burn, making it suitable for a wide range of gasoline engines. The conventional construction balances performance and durability, fitting many OEM specifications.

Technical Details and Compatibility

The Denso 3191 spark plug incorporates a nickel ground electrode core and tip, paired with a copper center electrode core and nickel tip, providing reliable conductivity and resistance to electrode wear. The single ground electrode with a U-groove tip design helps maintain consistent spark delivery. With a pre-gap size of 0.8 mm and a heat range of 16, this spark plug is engineered to meet the ignition demands of vehicles such as the Chrysler Crossfire, Jeep Grand Cherokee, Toyota Prius C, and Volkswagen Cabrio.

Common Applications and Problem Solving

• Compatible with models including Bentley Brooklands, Dodge Ram 1500, Hyundai Elantra, INFINITI G20, and Mercedes-Benz C240
• Addresses issues like misfires and rough idling caused by worn or faulty spark plugs
• Helps improve cold starts and engine responsiveness
• Reduces electrical interference with a 5000 ohm resistance rating
• Supports consistent fuel combustion for better engine efficiency

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 and verify the flat seat type matches the engine’s cylinder head design. The 19 mm reach must be compatible with the engine to avoid damage or improper seating. Follow manufacturer torque specifications to prevent over-tightening.

Quality Assurance and Warranty

Denso spark plugs, including the 3191 part number, are manufactured to meet strict quality standards for durability and performance. The materials used, such as nickel and copper electrodes, are selected for longevity and consistent ignition. While specific warranty details depend on the vehicle manufacturer or installer, Denso products typically come with a limited warranty against manufacturing defects.