Denso 3008 Spark Plug

Denso 3008 U-Groove Spark Plug Overview

The Denso 3008 is a conventional spark plug built for reliable secondary ignition performance in a wide range of import applications. Its U-Groove ground electrode design helps improve ignitability, supporting more efficient combustion in engines that call for this style of plug.

Compatible with select Honda Civic, Honda CRX, Acura Integra, and Nissan 300ZX applications, this plug is also used in other fitments such as Saab 900 and Mazda 323. The Denso 3008 is a practical OE-style replacement for drivers servicing older ignition systems.

Key Features

• U-Groove ground electrode tip design for improved spark exposure
• 5000 ohm resistance for controlled ignition performance
• Copper center electrode core for dependable conductivity
• Nickel center and ground electrode tip materials
• Standard ground configuration with one ground electrode
• Pre-gapped to 1.1 mm
• Flat seat design, 14.00 mm thread diameter, 19.00 mm reach
• Part number 3008 from Denso U-Groove Conventional

Product Details

Denso’s U-Groove Conventional line focuses on straightforward ignition service with a design that promotes better ignitability than a standard flat-ground layout. The U-shaped ground electrode helps expose the spark kernel more effectively, which can support smoother combustion in engines that are sensitive to plug design and gap consistency. With a copper core center electrode and nickel firing surfaces, the Denso 3008 is built for conventional ignition systems that require a 14 mm thread, flat seat, and 19.00 mm reach.

This spark plug is a direct service part for applications including 1988-1991 Honda Civic, 1988-1991 Honda CRX, 1986-1989 Acura Integra, 1986-1990 Acura Legend, 1984-1989 Nissan 300ZX, 1994-1996 Saab 900, and 1990-1994 Saab 9000. It also appears in fitments for 1988 Honda Prelude, 1988-1989 Mazda 323, and 1999 Plymouth Prowler. This part cross-references DENSO Auto Parts Q20PR-U11 for the same application.

What It Helps Address

• Hard starting caused by worn or inconsistent spark plugs
• Misfire concerns related to weak ignition output
• Rough idle in older Honda, Acura, Nissan, Mazda, or Saab engines
• Reduced combustion efficiency from aged secondary ignition components
• Service replacement needs for OE-style plug specifications

Installation Notes and Tips

Verify the engine calls for a 14.00 mm thread diameter, flat seat, 19.00 mm reach, and 1.1 mm pre-gap before installation. Check the existing plug condition, inspect the ignition wires or coil components, and confirm the gap specification matches the vehicle service data. For best results, install the Denso 3008 on engines listed in the fitment data and torque to the manufacturer’s specification.

Quality Assurance

Denso manufactures ignition components to OE-level specification standards for conventional service applications. The 3008 spark plug uses defined resistance, electrode materials, and dimensional specs to support consistent fit and function in the listed vehicles.