Denso 671-9003 Spark Plug Wire Set

Denso 671-9003 Spark Plug Wire Set

Denso 671-9003 is an 8mm spark plug wire set built to match factory-installed wire sets in form, fit, color, and performance. It is a direct replacement for Jaguar ignition service on select XJ12, XJS, and XJRS applications, with OE-style construction throughout.

Key Features

• 8mm insulation outside diameter for OE-style ignition wire routing and fit
• Silicone spark plug boot material for heat resistance and durability
• 90-degree spark plug end boots for tight engine bay routing
• Female spark plug end terminal type
• Male distributor/coil end terminal type
• OE/OES-level construction that matches factory-installed wire set specifications
• Direct-fit replacement for select Jaguar XJ12, XJS, and XJRS models

Product Details

The Denso First Time Fit line focuses on factory-style replacement parts, and this ignition wire set follows that approach with the same general form, fit, color, and performance expected from the original equipment design. The 8mm wire diameter supports proper routing and installation, while the silicone boots help maintain secure connections at the spark plug and distributor or coil ends. This part number, 671-9003, is listed for 1989-1992 Jaguar XJ12, 1994-1996 Jaguar XJ12, 1989-1992 Jaguar XJS, 1994-1995 Jaguar XJS, and 1993 Jaguar XJRS, all noted as 8mm applications.

This part cross-references NAPA Mileage Plus 6719003 for the same application.

What It Helps Address

• Misfires caused by worn or deteriorated ignition wires
• Hard starting related to weak spark delivery
• Rough idle from damaged wire insulation or poor terminal contact
• Voltage leakage from cracked or heat-aged plug wire boots
• Intermittent ignition performance on aging Jaguar ignition systems

Installation Notes

Verify the engine application and wire routing before installation. Match each lead to the correct spark plug and distributor or coil connection, and confirm the 90-degree spark plug boots clear nearby components. For Jaguar XJ12 and XJS service, compare the original wire layout and terminal style to ensure proper placement on the vehicle.

Quality Assurance

Denso First Time Fit ignition wire sets are manufactured to meet or exceed OE/OES standards in construction and performance. Part number 671-9003 is built as an OE-style replacement for select Jaguar ignition systems, including XJ12, XJS, and XJRS applications.

Compatible Vehicles

• Fits 1989-1992 Jaguar XJ12, N/A, 8mm
• Fits 1994-1996 Jaguar XJ12, N/A, 8mm
• Fits 1989-1992 Jaguar XJS, N/A, 8mm
• Fits 1994-1995 Jaguar XJS, N/A, 8mm
• Fits 1993 Jaguar XJRS, N/A, 8mm