Denso 671-6140 Spark Plug Wire Set

Denso 671-6140 Ignition Wire Set

Denso 671-6140 is a 7mm spark plug wire set built to match factory-installed form, fit, color, and performance. It uses silicone spark plug boot material and OE-style terminal configurations for a direct replacement on select Jaguar applications.

Key Features

• 7mm insulation outside diameter for OE-style ignition wire routing
• Silicone spark plug boot material for heat resistance and durability
• 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
• Direct replacement part number 671-6140 for select Jaguar XJ6 and Vanden Plas models

Product Details

The Denso First Time Fit line focuses on factory-style ignition wire sets that mirror the original part in form, fit, color, and performance. Part number 671-6140 is engineered for select 1978-1987 Jaguar XJ6 and 1982-1987 Jaguar Vanden Plas applications, making it a strong OE-style replacement when restoring ignition performance on these vehicles. This part cross-references NGK EUX004 and NAPA Mileage Plus 6716140 for the same application.

For buyers searching for a Jaguar XJ6 ignition wire set 7mm or a Jaguar Vanden Plas spark plug wire replacement, this Denso set provides the correct terminal style and boot configuration for the listed vehicles. The 90-degree spark plug boots help with routing around engine components, while the silicone construction supports consistent high-heat operation.

Common Issues This Part Addresses

• Misfires caused by worn or deteriorated ignition wires
• Hard starting related to weak spark delivery
• Rough idle from damaged boots or poor terminal contact
• Voltage leakage from cracked insulation
• Restoration needs for original-style Jaguar ignition components

Installation Notes and Tips

Verify engine application, terminal style, and wire routing before installation. Match each lead to the correct cylinder and follow the original routing path to avoid crossfire or heat exposure. Inspect distributor cap, coil connections, and spark plugs at the same time so the new wire set can perform as intended on 1978-1987 Jaguar XJ6 and 1982-1987 Jaguar Vanden Plas models.

Quality Assurance

Denso states that First Time Fit ignition wire sets are built to OE/OES standards and are intended to match factory-installed specifications in form and performance. That makes 671-6140 a dependable OE-style choice for Jaguar ignition service.