Denso 5364 Spark Plug

Denso Iridium Power Spark Plug 5364

Denso Iridium Power spark plug 5364 is built for drivers who want precise ignition performance from a compact iridium design. It uses a 0.4 mm iridium center electrode to support consistent spark delivery, along with a tapercut and U-groove ground electrode profile for efficient flame initiation.

Key Features

• Iridium Power line from Denso for performance-focused ignition service
• World’s smallest 0.4 mm iridium center electrode for fine-tip spark delivery
• Tapercut, U-groove ground electrode tip design
• 14.00 mm thread diameter, 19.00 mm reach, flat seat
• 0.9 pre-gap size for OE-style gap specification
• 5000 ohm resistance for ignition system compatibility
• Nickel ground electrode core with copper core center electrode
• 16.0 mm hex size and heat range 31

Detailed Description

Denso 5364 is a spark plug for secondary ignition service where stable spark quality and precise electrode geometry matter. The iridium center electrode helps maintain a focused spark point, while the tapercut and U-groove ground design supports efficient combustion event timing. This part cross-references DENSO Auto Parts IU31 for the same application. For buyers searching Denso spark plug 5364, Denso IU31, or Iridium Power spark plug replacement, this part matches the technical profile needed for many import ignition service applications, including Honda Civic and similar vehicle platforms where the correct thread, reach, seat, and gap specifications are critical.

Common Issues This Spark Plug Can Address

• Hard starting caused by worn or inconsistent spark plugs
• Rough idle from degraded ignition performance
• Misfire conditions related to electrode wear or incorrect gap
• Reduced throttle response from weak spark delivery
• Maintenance replacement for vehicles requiring a 14 mm, flat-seat plug with 19.00 mm reach

Installation Notes and Tips

Verify thread diameter, reach, seat type, heat range, and pre-gap size before installation. Use the correct torque specification for the cylinder head material and inspect ignition coils, boots, and wires during service. For vehicle-specific searches such as Honda Civic spark plug replacement or Denso 5364 fitment lookup, confirm the engine application against the required plug dimensions before final installation.

Quality Assurance

Denso manufactures this Iridium Power spark plug with an iridium fine-wire center electrode and OE-style dimensional specifications for consistent service fitment. The part number 5364 is engineered to meet the listed electrical and physical requirements for ignition system use.