Denso 5368 Spark Plug

Denso Iridium Power Spark Plug 5368

Denso Iridium Power 5368 is a performance-focused spark plug built for precise ignition response and stable combustion. It uses a 0.4 mm iridium center electrode, a copper core center electrode, and a nickel ground electrode to support consistent spark delivery in demanding ignition systems.

The Iridium Power line is Denso’s performance spark plug family, known for fine-wire iridium construction and compact electrode design. For drivers searching for a Denso spark plug for Honda Civic or other import applications, 5368 is a direct-fit style option where the listed specifications match the engine requirements.

Key Features

• Part number 5368 from Denso Iridium Power
• 0.4 mm iridium center electrode for fine-wire ignition performance
• Copper core center electrode for efficient heat transfer
• Nickel ground electrode with Tapercut and U-Groove tip design
• 5000 ohm resistor for ignition noise suppression
• 14.0 mm thread diameter, 19.0 mm reach, and flat seat design
• 0.9 pre-gap size and 16.0 mm hex size
• Manufacturer heat range 24

Detailed Description

Denso 5368 is engineered as a secondary ignition spark plug with an iridium center tip and a standard single-ground configuration. The fine 0.4 mm center electrode helps concentrate spark energy, while the tapercut and U-groove ground design supports efficient flame initiation. These specifications make it a strong match for drivers looking for a Denso Iridium Power spark plug 5368 for Honda Civic, as well as other vehicles that call for the same plug dimensions and heat range.

This part cross-references DENSO Auto Parts IUH24 for the same application.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Misfire conditions from weak or inconsistent spark output
• Rough idle related to degraded ignition performance
• Reduced throttle response from aging secondary ignition components
• Combustion instability under normal driving and load changes

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. Check the pre-gap against the engine specification and adjust only if the application calls for it. Use proper torque procedures and inspect ignition coils, boots, and wires during service to avoid repeat misfire concerns. For Honda Civic spark plug replacement searches, confirm the engine code and OE plug specification before ordering part number 5368.

Quality Assurance

Denso manufactures the Iridium Power line with fine-wire iridium electrode construction and application-specific ignition specifications. Part number 5368 is built to the listed dimensions and electrical resistance requirements for consistent service in the correct application.