Denso 5331 Spark Plug

Reliable Ignition Performance for Select GM and Ford Vehicles

The Denso Iridium Power 5331 spark plug is engineered to deliver consistent ignition and improved combustion efficiency. Designed for use in a variety of Buick, Chevrolet, Ford, and GMC models, this spark plug supports optimal engine performance and fuel economy.

• Iridium center electrode tip for enhanced durability and precise spark
• Tapercut, u-groove ground electrode tip design for improved ignitability
• 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 secure fitment
• Thread diameter of 14.00 mm and reach of 11.60 mm for proper installation
• Hex size of 16.0 mm for easy tightening
• Manufacturer heat range rating of 20 suitable for a range of 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 efficient spark. This technology supports improved throttle response and smoother engine operation compared to conventional plugs. The 5331 part number is part of this line, combining iridium durability with copper core technology to balance performance and longevity.

Technical Details and Compatibility

The Denso 5331 spark plug features a single ground electrode with a tapercut, u-groove tip design, which enhances ignitability and combustion efficiency. The copper core center electrode aids in heat transfer, helping maintain optimal operating temperatures. With a 1.1 mm pre-gap and a tapered seat, this spark plug ensures a secure and precise fit in compatible engines.

This spark plug is compatible with a wide range of vehicles including Buick, Cadillac, Chevrolet, Dodge, Ford, GMC, Isuzu, Mercury, Oldsmobile, and Pontiac models. Notable compatible models include the Chevrolet Silverado, Ford F-150, GMC Sierra, Buick Century, and Pontiac Grand Prix, among others.

Common Applications and Problem Solving

• Restores engine misfire issues caused by worn or fouled spark plugs
• Improves throttle response and acceleration in compatible vehicles
• Reduces rough idling and enhances overall combustion stability
• Helps maintain fuel efficiency by ensuring consistent ignition
• Minimizes electrical interference with a 5000 ohm resistance rating

Installation Notes and Tips

• Verify correct spark plug gap of 1.1 mm before installation
• Use a 16 mm socket wrench for proper tightening torque
• Ensure tapered seat matches engine specifications for a secure seal
• Inspect ignition wires and coils during replacement for optimal performance
• Follow vehicle manufacturer torque specifications to avoid damage

Quality Assurance and Warranty

Denso spark plugs, including the Iridium Power 5331, are manufactured to meet strict OEM standards for quality and durability. The use of iridium and copper core materials ensures long service life and reliable ignition performance. While specific warranty details may vary, Denso products typically come with a limited warranty covering defects in materials and workmanship.