Denso 671-4008 Spark Plug Wire Set

Denso 7mm Spark Plug Wire Set

Denso 671-4008 is a 7mm spark plug wire set built to match factory-installed wire sets in form, fit, color, and performance. It uses silicone spark plug boot material and OE-style terminal configurations to support reliable ignition performance on older Mazda, Nissan, and Subaru applications.

Key Features

• 7.00 mm insulation outside diameter for OE-style wire routing and fit
• Silicone spark plug boots for heat resistance and durability
• 180-degree spark plug end boot design for proper connection geometry
• Female spark plug end terminal type with male distributor/coil end terminal type
• Built to meet or exceed OE/OES standards for ignition wire construction
• Denso First Time Fit product line for factory-style replacement fitment

Product Details

The Denso First Time Fit line focuses on direct-replacement ignition components that mirror original equipment specifications. For this spark plug wire set, that means OE-style dimensions, terminal types, and boot design that align with factory routing and connection points. Part number 671-4008 is a practical choice for drivers servicing ignition systems on vehicles such as the Mazda B2200, Mazda 626, Mazda MX-6, Mazda B2000, Nissan 310, Nissan Sentra, and Subaru Standard.

This part cross-references ACDelco 16-834Q and Bosch 09040 for the same application.

What It Helps Address

• Misfires caused by worn or heat-damaged plug wires
• Hard starting related to weak ignition transfer
• Rough idle from deteriorated wire insulation or boot wear
• Voltage leakage across aging ignition wire insulation
• Intermittent ignition performance from poor terminal contact

Installation Notes

Verify wire routing against the original layout before removal, and transfer one wire at a time when possible to preserve firing order. Confirm the distributor/coil end and spark plug end terminal types match the vehicle’s ignition setup. This 7mm wire set is listed for 1982 Nissan 310, 1982 Nissan Sentra, 1986 Mazda B2000, 1986-1987 Subaru Standard, 1987-1993 Mazda B2200, 1988-1992 Mazda 626, and 1988-1992 Mazda MX-6.

Quality Assurance

Denso states that First Time Fit ignition wire sets are engineered to match factory-installed parts and are built to OE/OES standards or better. That makes Denso 671-4008 a direct-fit replacement option for owners maintaining original-style ignition performance on compatible Mazda, Nissan, and Subaru vehicles.