Denso 5339 Spark Plug

Reliable Ignition Performance for Buick, Ford, and More

The Denso Iridium Power 5339 spark plug is engineered to deliver consistent ignition and efficient combustion for a wide range of vehicles including Buick, Ford, Chevrolet, and Land Rover models. Designed with advanced materials and precise specifications, this spark plug supports optimal engine performance and durability.

• Iridium center electrode tip for enhanced durability and ignition
• Tapercut, u-groove ground electrode tip design for improved spark exposure
• Copper core center electrode for efficient heat dissipation
• Nickel ground electrode core material with standard ground configuration
• Pre-gap size of 1.1 mm and tapered seat type for precise fitment
• Thread diameter of 14.00 mm and reach of 25.00 mm for compatibility with specific engines
• Hex size of 16.0 mm for easy installation
• Manufacturer heat range of 20 suitable for various driving conditions
• Resistance rating of 5000 ohms to reduce electrical noise interference

About the Denso Iridium Power Spark Plug Line

The Iridium Power line from Denso focuses on delivering spark plugs with iridium-tipped electrodes that provide a stable and reliable spark. This technology enhances ignition efficiency and contributes to smoother engine operation. The 5339 model benefits from this advanced design, making it suitable for secondary ignition systems in many domestic and import vehicles.

Technical Details and Compatibility

The Denso 5339 spark plug features a single ground electrode with a tapercut, u-groove tip design, which increases the spark exposure area for better combustion. The copper core center electrode improves heat transfer, helping maintain optimal operating temperatures. The nickel ground electrode core ensures durability under high-stress conditions. With a pre-gap size of 1.1 mm and a tapered seat, this spark plug fits securely in engines requiring a 14 mm thread diameter and 25 mm reach.

Applications and Problem Solving

• Compatible with Buick, Cadillac, Chevrolet, Ford, GMC, Jaguar, Land Rover, Lincoln, Mazda, Mercury, and Saturn vehicles
• Addresses issues such as misfires, rough idling, and poor fuel economy
• Helps reduce ignition system electrical noise with 5000 ohm resistance
• Supports consistent engine starts and smooth acceleration
• Suitable for models including Ford F-150, Chevrolet Camaro, Buick LaCrosse, and Land Rover Discovery Sport

Installation Notes and Tips

• Ensure the spark plug gap is set to 1.1 mm before installation if not pre-gapped
• Use a 16 mm socket wrench for proper torque application
• Verify compatibility with your vehicle’s engine specifications, especially thread diameter and reach
• Apply anti-seize compound on threads if recommended by the vehicle manufacturer
• Replace spark plugs in sets to maintain balanced engine performance

Quality Assurance and Warranty

Denso spark plugs, including the Iridium Power 5339, are manufactured to meet strict OEM standards for quality and reliability. While specific warranty details may vary, Denso products typically come with a limited warranty covering defects in materials and workmanship. Always consult your vehicle’s service manual and Denso’s warranty policy for precise information.