Denso 4022 Spark Plug

Denso 4022 U-Groove Spark Plug Overview

The Denso 4022 is a conventional spark plug built around a U-groove ground electrode design for improved ignitability and more consistent combustion. It uses a copper core center electrode with nickel tip materials and a 5,000-ohm resistor for stable secondary ignition performance.

For drivers searching for a Denso spark plug for Honda Civic or Toyota Corolla secondary ignition service, this part number 4022 offers OE-style construction with a flat seat, 14.00 mm thread diameter, 12.70 mm reach, and 0.7 pre-gap size.

Key Features

• U-groove ground electrode design for stronger spark exposure
• Copper core center electrode for efficient heat transfer
• Nickel center and ground electrode tip materials
• 5000-ohm resistor for reduced electrical noise
• Standard ground configuration with one ground electrode
• Flat seat, 14.00 mm thread diameter, 12.70 mm reach
• Manufacturer heat range 22 and 0.7 pre-gap size

Product Line Details

Denso U-Groove Conventional spark plugs are built for drivers who want a traditional plug design with a shaped ground electrode that helps expose the spark kernel more effectively. In applications such as Honda Civic and Toyota Corolla maintenance, the Denso 4022 is a practical choice for routine ignition service where OE-style dimensions matter.

What This Spark Plug Helps Address

• Hard starting caused by worn or inefficient spark plugs
• Rough idle from weak or inconsistent ignition output
• Misfire conditions related to degraded plug electrodes
• Reduced fuel efficiency from incomplete combustion
• Excess ignition noise in secondary ignition circuits

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range against the original plug before installation. Set the gap to the specified 0.7 measurement if required by the application, and inspect ignition wires or coils during service to avoid repeat misfire concerns. This part cross-references DENSO Auto Parts (e.g., W22FPR-U) for the same application.

Quality Assurance

Denso manufactures this spark plug to OE-style dimensional standards for secondary ignition service. The copper-core, nickel-tip construction and U-groove electrode layout are engineered to support reliable spark delivery in the intended application.