Denso 3426 Spark Plug

Reliable Ignition Performance for Acura, Honda, Lexus, and More

The Denso Iridium Long Life (SIP) spark plug, part number 3426, is engineered to deliver consistent ignition performance for a range of vehicles including Toyota Camry, Subaru Outback, and Volvo XC90. Designed with advanced materials and precise specifications, this spark plug supports efficient combustion and engine reliability.

• Iridium center electrode tip for enhanced durability and ignition
• Platinum needle ground electrode tip with needle-to-needle configuration
• Copper core center electrode for optimal conductivity
• Nickel ground electrode core material for strength
• Pre-gap size of 1.1 mm for precise spark delivery
• Flat seat type with 14 mm thread diameter and 26.5 mm reach
• Hex size of 16.0 mm for standard installation tools
• Manufacturer heat range rating of 20 for balanced thermal performance
• Resistance of 5000 ohms to reduce electrical noise interference

About the Denso Iridium Long Life (SIP) Spark Plug Line

The Iridium Long Life (SIP) product line from Denso focuses on extended durability and stable ignition performance. Featuring iridium-tipped center electrodes and platinum needle ground electrodes, these spark plugs are designed to maintain consistent spark quality over longer service intervals. The combination of materials and design in the 3426 part number supports reliable operation in secondary ignition systems across multiple vehicle makes and models.

Technical Details and Compatibility

This spark plug is compatible with a variety of vehicles including Acura ILX, Honda Civic, Lexus RX350, Subaru Legacy, Toyota Highlander, and Volvo S60. The needle-to-needle ground electrode configuration and iridium tip improve ignition efficiency, while the copper core center electrode enhances electrical conductivity. The flat seat and 14 mm thread diameter ensure proper fitment in specified engines. The 1.1 mm pre-gap size is optimized for these applications to support efficient combustion.

Common Applications and Problem Solving

• Replacement for worn or fouled spark plugs causing misfires
• Improves ignition stability in vehicles experiencing rough idling
• Helps restore fuel efficiency in engines with degraded spark plugs
• Reduces electrical interference with a 5000 ohm resistance rating
• Supports consistent engine start-up and acceleration response

Installation Notes and Tips

When installing the Denso 3426 spark plug, ensure the engine is cool to prevent thread damage. Use a torque wrench to tighten to manufacturer specifications, typically around 18-22 Nm, to avoid over-tightening. Verify the pre-gap size of 1.1 mm before installation, adjusting if necessary. The 16 mm hex size allows for standard spark plug sockets. Inspect the spark plug seat and threads for cleanliness to ensure proper sealing.

Quality Assurance and Warranty

Denso spark plugs undergo rigorous quality control to meet OEM standards. The Iridium Long Life (SIP) spark plug 3426 is manufactured with high-grade materials including iridium and platinum for longevity and consistent performance. While specific warranty terms may vary, Denso products typically come with a limited warranty covering defects in materials and workmanship.