Denso 671-8078 Spark Plug Wire Set

Denso 671-8078 Ignition Wire Set

Denso 671-8078 is a spark plug wire set built to match factory-installed wire sets in form, fit, color, and performance. It is a direct OE-style replacement for Ford, Lincoln, and Mercury applications that use 8mm ignition wires, including many Ford Bronco, F-150, and Mustang models.

Key Features

• 8.00 mm insulation outside diameter for OE-style ignition wire routing and fit
• Silicone spark plug boot material for heat resistance and stable connection at the plug
• 115-degree spark plug end boot angle for applications that require angled terminal access
• Female spark plug end terminal type and female distributor/coil end terminal type
• Built to meet or exceed OE/OES standards for construction and performance
• Direct replacement part number 671-8078 for select Ford, Lincoln, and Mercury ignition systems

Product Details

The Denso First Time Fit line is engineered as an OE-style ignition wire solution, and this 671-8078 set follows the original equipment layout used on many 1979-1993 Ford and Mercury vehicles. It is a strong match for drivers searching for a spark plug wire set for a 1988-1993 Ford Bronco, 1988-1993 Ford F-150, 1984-1993 Ford Mustang, or 1987-1992 Lincoln Mark VII. This part cross-references ACDelco 16-818B and Bosch 09614 for the same application.

Use Denso 671-8078 when you need a replacement ignition wire set that preserves factory-style terminal design and wire diameter. The 8mm construction and silicone boots support consistent spark delivery across the ignition system while maintaining the original routing and connection style expected on compatible Ford, Lincoln, and Mercury platforms.

Common Problems This Part Can Address

• Misfires caused by worn or heat-damaged ignition wires
• Hard starting related to weak spark transfer
• Intermittent ignition performance from cracked boots or deteriorated insulation
• Rough idle from poor wire-to-plug or wire-to-coil contact
• Voltage leakage in aging 8mm ignition wire assemblies

Installation Notes and Tips

Verify engine and ignition system configuration before ordering, especially on Ford applications noted with EEC IV in the fitment data. Match each wire to the original routing path, and confirm the female terminal ends and 115-degree spark plug boot orientation before installation. For best results, replace wires one at a time to preserve firing order and reduce the chance of cross-connection.

Quality Assurance

Denso First Time Fit ignition wire sets are manufactured to OE/OES-level standards and are intended to replicate factory fit and performance. The 671-8078 part number is listed for broad interchange coverage across select aftermarket references, supporting confident replacement selection for compatible Ford, Lincoln, and Mercury ignition systems.