Denso 671-4051 Spark Plug Wire Set

Denso 8mm Spark Plug Wire Set 671-4051

Denso First Time Fit ignition wire sets are built to match factory-installed wire sets in form, fit, color, and performance. This Denso 8mm spark plug wire set, part number 671-4051, is made for direct replacement on select Ford and Mercury applications, including Mustang, Ranger, Thunderbird, Aerostar, LTD, Capri, Cougar, Marquis, Fairmont, Zephyr, Pinto, and Bobcat.

Key Features

• 8.00 mm insulation outside diameter for OE-style wire routing and fit
• Silicone spark plug boot material for heat resistance and durability
• 180-degree spark plug end boot design
• Female spark plug end terminal type
• Female distributor coil end terminal type
• Built to meet or exceed OE/OES standards in construction

Product Details

The Denso 671-4051 ignition wire set is engineered as a direct OE-style replacement for vehicles that require an 8mm wire diameter and female terminal ends. The First Time Fit product line focuses on matching original equipment dimensions and performance characteristics, which helps maintain proper ignition routing and consistent electrical transfer. For shoppers searching for a Ford Mustang spark plug wire set, Ford Ranger ignition wire set, or Mercury Capri 8mm plug wire replacement, this part number provides a factory-style solution.

This part cross-references ACDelco 16-814H and Beck/Arnley 175-4944 for the same application.

What It Helps Address

• Misfires caused by worn or damaged ignition wires
• Hard starting related to weak spark delivery
• Rough idle from inconsistent ignition output
• Voltage leakage from cracked insulation or aged boots
• Routing issues when replacing an OE-style Ford or Mercury wire set

Installation Notes and Tips

Verify connector style, boot angle, and engine application before installation. This Denso 8mm wire set uses silicone boots and female terminals, so matching the original routing and terminal orientation is important for proper fit. Confirm the vehicle application against the listed fitment before ordering, especially on Ford Mustang 1979-1990, Ford Ranger 1983-1989, and Mercury Capri 1977-1980 models.

• Fits 1979-1990 Ford Mustang, N/A
• Fits 1983-1989 Ford Ranger, N/A
• Fits 1983-1988 Ford Thunderbird, N/A
• Fits 1986-1987 Ford Aerostar, N/A
• Fits 1983-1986 Ford LTD, N/A
• Fits 1977-1980 Ford Pinto, N/A
• Fits 1978-1983 Ford Fairmont, N/A
• Fits 1979-1986 Mercury Capri, N/A
• Fits 1984-1986 Mercury Cougar, N/A
• Fits 1983-1986 Mercury Marquis, N/A
• Fits 1978-1983 Mercury Zephyr, N/A
• Fits 1977-1980 Mercury Bobcat, N/A

Quality Assurance

Denso First Time Fit ignition wire sets are manufactured to align with OE/OES standards for form and performance. Part number 671-4051 is built for direct replacement use on the listed Ford and Mercury applications.