Denso 3444 Spark Plug

Reliable Ignition Performance for Select Vehicles

The Denso Iridium Long Life 3444 spark plug is engineered to provide consistent ignition and durability for a range of vehicles including Toyota Corolla, Lexus CT200h, and Land Rover Range Rover Sport. Designed with advanced materials, this spark plug supports efficient combustion and long service intervals.

• Iridium center electrode tip for enhanced durability and ignition
• Platinum chip ground electrode tip for stable spark and wear resistance
• Copper core center electrode for improved conductivity
• Standard ground configuration with a single nickel ground electrode
• Pre-gap size of 1.1 mm optimized for precise spark delivery
• Flat seat type with 12 mm thread diameter and 26.5 mm reach
• Hex size of 14.3 mm for easy installation
• Manufacturer heat range rating of 20 for balanced thermal performance

About the Iridium Long Life Product Line

The Iridium Long Life line from Denso focuses on delivering extended service life and reliable ignition through the use of iridium and platinum materials. This combination reduces electrode wear and maintains stable spark performance over time, making it suitable for vehicles requiring consistent ignition under various driving conditions.

Technical Details and Compatibility

The Denso 3444 spark plug features a copper core center electrode with an iridium tip, which enhances electrical conductivity and durability. The ground electrode uses a platinum chip tip on a nickel core, providing resistance to erosion. With a 1.1 mm pre-gap and a flat seat design, this spark plug ensures optimal spark efficiency and fitment. Compatible with a variety of makes and models such as Toyota Corolla, Lexus CT200h, Nissan Frontier, Land Rover LR4, and Jaguar XF, it supports secondary ignition system needs effectively.

Common Applications and Problem Solving

• Improves engine misfire issues in compatible vehicles
• Reduces rough idling caused by worn spark plugs
• Enhances fuel efficiency through consistent ignition
• Addresses hard starting problems in cold or humid conditions
• Minimizes electrode wear for longer maintenance intervals

Installation Notes and Tips

Ensure the spark plug gap is set to the manufacturer’s specification of 1.1 mm before installation. Use a 14.3 mm socket for proper torque application. The flat seat design requires careful seating to avoid damage to the cylinder head. 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 strict quality standards and undergo rigorous testing for durability and performance. The Iridium Long Life 3444 spark plug is designed to provide reliable ignition over extended service intervals. Warranty coverage details should be confirmed with the vehicle manufacturer or authorized service provider.