Denso 5383 Spark Plug

Denso Iridium Power Spark Plug 5383

Denso Iridium Power 5383 is a performance spark plug built for precise ignition control 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 engine conditions.

Compatible With applications that call for a 14.00 mm thread diameter, 12.70 mm reach, flat seat, 16.0 mm hex, and 0.8 mm pre-gap. This Denso spark plug is a direct choice for drivers searching for Denso 5383 spark plug replacement, Iridium Power ignition service parts, and secondary ignition maintenance for Honda Civic and Toyota Corolla applications where the specified plug dimensions match the engine requirement.

Key Features

• Iridium tip center electrode for fine-wire spark delivery
• 0.4 mm center electrode design for focused ignition performance
• Copper core center electrode for efficient heat transfer
• Tapercut and U-groove ground electrode tip design
• Standard ground configuration with one ground electrode
• 5000 ohm resistance for ignition system compatibility
• 14.00 mm thread diameter, 12.70 mm reach, and flat seat
• 16.0 mm hex size for proper socket fitment

Product Details

The Denso Iridium Power line is engineered around a fine iridium firing tip that reduces the electrode size at the spark point, helping the plug deliver a concentrated spark. Part number 5383 follows Denso’s Iridium Power design approach with a nickel ground electrode, copper core center electrode, and a tapercut U-groove ground profile to support reliable ignition performance. This part cross-references DENSO Auto Parts IUF22 for the same application. For buyers comparing Denso 5383 against OE-style service parts, the listed dimensions and heat range are the key identifiers for correct selection.

Common Issues This Plug Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition firing
• Misfire symptoms tied to plug wear or excessive gap
• Reduced throttle response from weak spark delivery
• Maintenance replacement for plugs that no longer meet spec

Installation Notes and Tips

Verify thread diameter, reach, seat type, hex size, and heat range against the engine specification before installation. Check the pre-gap size and confirm the ignition system is in good condition before fitting the plug. Use the correct torque procedure for the cylinder head material and inspect the coil, wires, or boots for wear while servicing the plug.

Quality Assurance

Denso manufactures this Iridium Power spark plug to support precise ignition performance with a fine iridium center electrode and application-specific construction. Part number 5383 is built to the published dimensions and electrical resistance listed for this plug design.