Denso 3348 Spark Plug

Denso 3348 Spark Plug Overview

The Denso 3348 is a U-Groove conventional spark plug built to OEM quality standards for steady ignition performance. It uses a copper core center electrode with a nickel tip and a nickel ground electrode to support reliable spark delivery in everyday driving.

For drivers searching for a Denso spark plug for Honda applications, this part number 3348 is a direct OE-style service option for select Honda ignition systems. The Denso U-Groove Conventional line focuses on consistent combustion support with a standard electrode layout and factory-style dimensions.

Key Features

• Brand: Denso U-Groove Conventional spark plug
• Part number: 3348
• Manufactured to OEM quality standards
• 5000 ohm resistor for ignition noise suppression
• Copper core center electrode with nickel tip
• Nickel ground electrode with standard configuration
• Pre-gapped at 1.1 mm
• 14.0 mm thread diameter, 19.0 mm reach, flat seat
• 16.0 mm hex size for standard service tools

Product Details

The Denso 3348 spark plug is engineered as a conventional replacement plug with a U-groove design that supports dependable spark exposure at the electrode. Its 5000 ohm resistance helps control electrical interference, while the copper core construction promotes stable heat transfer during operation. This makes it a practical choice for Honda ignition service where OE-style dimensions and material selection matter. If you are comparing Denso 3348 spark plug options for Honda Civic or other Honda models, this part number provides a straightforward replacement path based on factory-style specifications.

This part cross-references DENSO Auto Parts KJ22CR-L11 for the same application.

Common Issues It Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition firing
• Misfire conditions related to plug wear or gap drift
• Reduced throttle response from weak spark delivery
• Ignition noise concerns in resistor-equipped systems

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. The Denso 3348 uses a flat seat, 14.0 mm thread diameter, 19.0 mm reach, and a 16.0 mm hex size, so confirm the cylinder head specification matches before service. Check the existing plug condition and inspect ignition components during replacement to help maintain consistent performance. For Honda Civic and other Honda applications, follow the vehicle service manual for torque and service intervals.

Quality Assurance

Denso manufactures this spark plug to OEM quality standards, with materials and dimensions selected for factory-style service replacement. The U-Groove Conventional line is built for dependable ignition performance in standard maintenance applications.