Denso 4052 Spark Plug

Denso 4052 U-Groove Conventional Spark Plug

Denso 4052 is a conventional spark plug built with a U-groove ground electrode to improve ignitability and support more efficient combustion. It uses a copper center electrode core with nickel tip materials for dependable secondary ignition performance in the right application.

Key Features

• U-groove ground electrode tip design for improved spark exposure
• Standard ground configuration with one ground electrode
• Copper center electrode core for stable heat transfer
• Nickel center and ground electrode tip materials
• Pre-gapped to 0.7 for installation in the specified application
• 14.00 mm thread diameter, 12.70 mm reach, flat seat
• Manufacturer heat range 27

Product Details

This Denso spark plug is part of the U-Groove Conventional line, a product line focused on straightforward OE-style ignition service with a ground electrode shape that exposes the spark more effectively than a standard flat design. For drivers searching for Denso 4052 spark plug replacement options, Denso W27FS-U interchange reference, or a conventional ignition tune-up part, this plug is built around the listed dimensions and electrode materials for the specified engine application. It is a practical choice for secondary ignition service on vehicles such as Honda Civic and other applications that call for the same specifications.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent ignition output
• Misfire conditions tied to degraded plug electrodes
• Reduced combustion efficiency from incorrect plug gap or worn tips
• Service intervals where a conventional replacement spark plug is required

Installation Notes

Verify thread diameter, reach, seat type, heat range, and pre-gap before installation. Use the vehicle service specification for torque and gap verification, and confirm the engine calls for a 14.00 mm, flat-seat plug with a 12.70 mm reach. For fitment-based searches, this part is commonly referenced for Honda Civic spark plug replacement and similar Denso 4052 applications where the listed dimensions match the engine requirements.

Quality Assurance

Denso manufactures this plug to the stated OE-style dimensions and electrode construction for consistent ignition service. The U-Groove design is intended to improve ignitability and support engine efficiency in the correct application.