Denso 5360 Spark Plug

Denso Iridium Power Spark Plug 5360

Denso Iridium Power spark plug 5360 is built for drivers who want precise ignition performance from a compact iridium design. It uses a 0.4 mm iridium center electrode to promote consistent spark delivery, along with a tapercut and U-groove ground electrode profile for efficient flame initiation.

For Honda Civic and similar applications that call for a fine-wire iridium plug, Denso 5360 offers a technical OE-style upgrade focused on ignition stability, throttle response, and long service life in the secondary ignition system.

Key Features

• Iridium Power line from Denso for performance-focused ignition service
• 0.4 mm iridium center electrode for a fine-wire spark point
• Tapercut, U-groove ground electrode tip design
• 5000 ohm resistor for radio noise suppression
• Copper core center electrode and nickel ground electrode core
• Pre-gapped to 0.9 mm
• 14.0 mm thread diameter, 19.0 mm reach, flat seat
• 16.0 mm hex size for standard service tools
• Manufacturer heat range 20

Product Details

The Denso Iridium Power 5360 spark plug is engineered around a small-diameter iridium center electrode to concentrate the spark and support reliable combustion. The tapercut and U-groove ground electrode design helps expose the flame kernel more efficiently, while the resistor construction helps reduce ignition interference in modern vehicle electrical systems. This plug is a strong match for Honda Civic ignition service where the specified thread diameter, reach, seat type, and gap are required.

This part cross-references DENSO Auto Parts IU20 for the same application.

Common Symptoms It Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent ignition output
• Misfire codes related to degraded secondary ignition performance
• Reduced throttle response from inefficient spark delivery
• Fuel economy loss tied to incomplete combustion

Installation Notes

Verify the required thread diameter, reach, seat type, and heat range before installation. Check the pre-gap against the vehicle specification before use, and inspect ignition coils, boots, and plug wires for wear at the same time. For Honda Civic spark plug replacement and other fitment-based searches, confirm the engine application matches the plug dimensions listed here.

Quality Assurance

Denso is a recognized OE supplier in the ignition category, and the Iridium Power line is built around fine-wire iridium electrode technology for consistent spark performance. Part number 5360 is specified for applications that call for this plug’s dimensions and heat range.