Denso 3268 Spark Plug

Denso 3268 U-Groove Spark Plug Overview

The Denso 3268 spark plug is part of the U-Groove Conventional line, built for drivers who want a straightforward ignition service part with OE-style construction. Its U-groove ground electrode design is engineered to improve ignitability, helping support more consistent combustion and engine efficiency.

For shoppers searching for a Denso spark plug for Honda Civic or Toyota Corolla ignition service, this part number 3268 offers a conventional copper-core design with a nickel center electrode tip and a standard ground configuration.

Key Features

• U-Groove ground electrode tip design for improved ignitability
• Conventional spark plug construction for routine ignition maintenance
• Copper center electrode core material for dependable heat transfer
• Nickel center electrode tip and nickel ground electrode core material
• 5000 ohm resistance for ignition system compatibility
• Pre-gapped at 1.0 mm
• 14.00 mm thread diameter, 12.70 mm reach, and flat seat type
• 20.6 mm hex size for proper socket fitment

Product Details

Denso 3268 is a secondary ignition spark plug designed around a U-Groove ground electrode, a feature that increases the exposed ignition area at the gap. That design can support more reliable spark initiation and smoother combustion in engines that call for a conventional plug with a 1.0 mm pre-gap. The copper core helps manage heat, while the nickel electrode materials provide a durable firing surface for standard service intervals. This part cross-references DENSO Auto Parts (e.g., W20FPR-U10) for the same application.

When you need a Denso 3268 spark plug for Honda Civic or Toyota Corolla maintenance, this plug provides the core dimensions and electrode layout expected in many OE-style ignition service applications. It is a practical choice for drivers replacing worn plugs during scheduled tune-up work.

Common Symptoms It May Address

• Rough idle caused by worn or fouled spark plugs
• Hard starting from weak ignition performance
• Misfire conditions related to excessive plug wear
• Reduced fuel efficiency from inconsistent combustion
• Sluggish throttle response during acceleration

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. Use the specified gap setting for the engine application if the vehicle requires a different gap than the pre-gap provided. Inspect ignition wires or coil-on-plug components during service, and confirm the plug socket fits the 20.6 mm hex size. For fitment-based searches, this Denso 3268 spark plug is commonly sought for Honda Civic and Toyota Corolla ignition maintenance, but final application should always be matched to the vehicle’s engine specification.

Quality Assurance

Denso’s U-Groove Conventional line focuses on practical ignition performance with OE-style engineering and consistent manufacturing standards. Part number 3268 is built to the listed specifications for proper secondary ignition service.