Denso 5344 Spark Plug

Denso Iridium Power Spark Plug 5344

Denso Iridium Power 5344 is a performance spark plug built for precise ignition and stable combustion in a wide range of import and domestic applications. It uses a 0.4 mm iridium center electrode, a tapered cut ground tip, and a U-groove design to support consistent spark delivery in demanding driving conditions.

Key Features

• Iridium center electrode tip material for durable ignition performance
• World’s smallest 0.4 mm iridium center electrode for focused spark initiation
• Tapercut and U-groove ground electrode tip design
• 5000 ohm resistor for ignition system noise suppression
• Copper center core and nickel ground electrode core construction
• Pre-gapped at 1.1 mm with a flat seat design
• 14.00 mm thread diameter, 26.50 mm reach, and 16.0 mm hex size

Product Details

The Iridium Power line is Denso’s performance-focused spark plug family, engineered around a fine-wire iridium center electrode and a shaped ground electrode to promote efficient flame propagation. Part number 5344 is a direct replacement option for many vehicles, including select Toyota Tundra, Lexus GX460, and Ford F-150 applications, as well as other fitments listed below. This part cross-references DENSO Auto Parts IKH20 for the same application.

Compatible fitment examples include Fits 2018-2021 Toyota Tundra, N/A; Fits 2017-2022 Lexus GX460, N/A; and Fits 2021-2022 Ford F-150, N/A. Additional coverage includes select Dodge Challenger, Dodge Charger, Ram 1500, Subaru WRX STI, BMW 328i, and Volvo XC60 applications.

What It Helps Address

• Rough idle caused by worn or inconsistent spark plugs
• Hard starting from weakened ignition performance
• Misfire concerns related to degraded electrode wear
• Reduced throttle response from inefficient combustion
• Maintenance replacement for vehicles calling for an iridium plug

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. Confirm the vehicle-specific application in the fitment data, especially on models that use special notes such as two spark plugs per cylinder or intake/exhaust-specific positions. Use the specified gap as supplied unless the application requires a different setting, and follow the manufacturer service procedure for torque and plug access.

Quality Assurance

Denso designs the Iridium Power series around a fine iridium center electrode and shaped ground tip for consistent ignition performance across a broad range of OE-style applications. Part number 5344 is built to match the listed specifications and fitment coverage for direct replacement use.