Denso 671-8091 Spark Plug Wire Set

Denso 671-8091 Spark Plug Wire Set

Denso 671-8091 is a spark plug wire set built to match factory-installed wire sets in form, fit, color, and performance. It is a direct replacement for 1996-1998 Ford Mustang applications with 8mm wire diameter, making it a practical choice for restoring ignition performance on the Ford Mustang.

Key Features

• Direct OE-style replacement spark plug wire set
• 8.00mm insulation outside diameter for consistent ignition routing
• Sil PBT Sil spark plug boot material for durable terminal protection
• 90-degree spark plug end boot design for tight engine bay routing
• Female spark plug end terminal type with male distributor/coil end terminal type
• Built to meet or exceed OE/OES standards in construction
• Fits 1996-1998 Ford Mustang, N/A

Product Details

The Denso First Time Fit line is engineered as an OE-style ignition wire solution for drivers who want the original fit and performance profile without changing the factory layout. Part number 671-8091 uses 8mm insulation and a 90-degree spark plug boot to support clean routing and secure connection points. For Ford Mustang owners searching for a 1996-1998 Ford Mustang spark plug wire set or a Denso 671-8091 ignition wire replacement, this set is built around the original application requirements.

This part cross-references ACDelco 16-818W and NAPA Mileage Plus 6718091 for the same application.

Common Issues This Part Can Address

• Misfires caused by worn or damaged ignition wires
• Hard starting related to weak spark delivery
• Rough idle from deteriorated wire insulation or boot wear
• Voltage leakage from cracked or aged plug wire jackets
• Poor engine response from inconsistent ignition transfer

Installation Notes and Tips

Verify routing against the original wire layout before removal so each lead returns to the correct cylinder and terminal location. Inspect coil and spark plug connection points for corrosion, carbon tracking, or heat damage before installing the new set. On 1996-1998 Ford Mustang applications, confirm the 8mm wire specification and boot angle match the vehicle’s original ignition setup.

Quality Assurance

Denso states that First Time Fit ignition wire sets are made to match factory-installed wire sets in form, fit, color, and performance, with construction that meets or exceeds OE/OES standards. Part number 671-8091 is built to those original-equipment expectations for dependable ignition service.