Denso 3073 Spark Plug

Denso 3073 U-Groove Spark Plug

The Denso 3073 spark plug is a conventional ignition component built for steady secondary ignition performance. Its U-groove ground electrode design promotes easier spark initiation, helping support more efficient combustion in everyday driving.

Key Features

• U-groove ground electrode tip design for improved ignitability
• Nickel ground electrode tip with a copper core center electrode
• Standard ground configuration with a single ground electrode
• Pre-gapped to 0.7 mm for direct service use
• 14.00 mm thread diameter, 12.70 mm reach, and flat seat design
• Manufacturer heat range 20 for conventional ignition applications
• Cross-reference: DENSO Auto Parts W20FS-U

Product Details

Built under Denso’s U-Groove Conventional line, part number 3073 focuses on reliable spark delivery with a design that helps expose the spark kernel more effectively than a standard flat ground tip. The copper-core center electrode supports consistent conductivity, while the nickel tip materials are selected for conventional spark plug service. For drivers searching for a Denso 3073 spark plug or a Denso W20FS-U replacement, this part provides a straightforward OE-style service option for ignition maintenance. It is a practical choice for secondary ignition service on vehicles such as Honda Civic and Toyota Corolla applications where the specified plug dimensions and heat range match the engine requirements.

Common Issues This Spark Plug Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent spark output
• Misfire conditions related to degraded ignition performance
• Reduced fuel efficiency from incomplete combustion
• Loss of throttle response from aged secondary ignition components

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. The Denso 3073 uses a flat seat and 14.00 mm thread diameter, so it should be matched only to engines specified for those dimensions. Check the pre-gap against the vehicle service specification before installing, and inspect ignition wires or coils at the same time to avoid repeat misfire concerns. For fitment-based searches, this spark plug is commonly sought for Honda Civic and Toyota Corolla maintenance when the engine calls for the listed Denso configuration.

Quality Assurance

Denso’s U-Groove Conventional spark plug line is built around a design that improves spark exposure for dependable ignition performance. Part number 3073 follows the listed construction and dimensional specifications for accurate service replacement.