Denso 4114 Spark Plug

Denso 4114 U-Groove Spark Plug

Denso 4114 is a conventional spark plug built for reliable secondary ignition performance. Its U-Groove ground electrode design helps improve ignitability, supporting more consistent combustion and engine efficiency in the right application.

Key Features

• U-Groove ground electrode tip design for improved spark exposure
• Nickel ground electrode tip with a nickel center electrode tip
• Copper center electrode core for stable heat transfer
• Standard ground configuration with one ground electrode
• Pre-gapped to 0.7 mm
• Flat seat design, 12.00 mm thread diameter, 19.00 mm reach, and 18.0 mm hex size
• Manufacturer heat range 27

Detailed Description

This Denso spark plug, part number 4114, is part of the U-Groove Conventional line. The U-Groove electrode profile increases the spark path exposure at the firing point, which helps promote dependable ignition under normal operating conditions. With a copper core center electrode and nickel electrode materials, this plug is built around a straightforward OE-style construction for steady performance and serviceability. This part cross-references DENSO Auto Parts (e.g., X27ES-U) for the same application.

For buyers searching for Denso 4114 spark plug replacement options, this part is a direct match for applications that call for the listed thread diameter, reach, seat type, and heat range. It is also a relevant search term for Denso 4114 Honda Civic and Denso 4114 Toyota Corolla ignition service where the vehicle specification matches the plug requirements.

What It Helps Address

• Hard starting caused by worn or inefficient spark plugs
• Rough idle from weak or inconsistent ignition
• Misfire conditions related to electrode wear
• Reduced combustion efficiency from degraded spark delivery
• Service intervals where a conventional replacement plug is specified

Installation Notes and Tips

Verify the engine’s required thread diameter, reach, seat type, heat range, and pre-gap before installation. Use the specified gap setting for the application and inspect the ignition system, including wires or coils, if the old plug shows signs of fouling, overheating, or abnormal wear. For fitment-focused searches, confirm the vehicle application by year, make, and model before ordering Denso 4114.

Quality Assurance

Denso manufactures ignition components to OE-level specifications for secondary ignition service. The U-Groove Conventional design is engineered around dependable spark initiation and consistent electrode construction for routine maintenance replacement.