Standard Wires 55421 Spark Plug Wire Set

Ignition Wire Set for Jaguar Vanden Plas, XJ6, XJR, and XJS

Standard Wires 55421 is a spark plug wire set for select Jaguar applications with conventional ignition systems. It is built to route high voltage to the spark plugs while adding abrasion resistance, heat protection, and improved radio-frequency interference control.

Key Features

• Patented clear-coat outer finish with a high-temperature silicone jacket
• OE-type wire core design matched to low ohm, ferrite mag, wire wound, silicone, or metallic core requirements
• Improved abrasion resistance for demanding engine bay conditions
• Heat protection for severe temperature exposure
• Enhanced RFI suppression for cleaner ignition performance
• Standard Wires part number 55421

Product Details

This Standard Wires spark plug wire set is engineered for 1987-1995 Jaguar ignition service applications, including 1987-1994 Jaguar XJ6, 1988-1994 Jaguar Vanden Plas, 1992-1994 Jaguar XJS, and 1995 Jaguar Vanden Plas, XJ6, XJR, and XJS without direct ignition. The construction focuses on stable voltage transfer, insulation durability, and resistance to heat and wear in the engine compartment. If you are servicing a Jaguar XJ6 or Jaguar XJS ignition system, part number 55421 provides a direct-fit replacement option for the listed vehicles.

Common Issues This Part Addresses

• Misfires caused by worn or heat-damaged plug wires
• Voltage leakage from cracked or deteriorated insulation
• Radio interference from aging ignition leads
• Reduced spark delivery at the spark plug
• Abrasion damage from routing near hot or moving engine components

Installation Notes and Tips

Verify engine configuration and ignition type before ordering. This listing is for 1995 Jaguar Vanden Plas, XJ6, XJR, and XJS without direct ignition, plus the earlier Jaguar applications shown in the fitment data. Route each lead to match the original layout, keep wires separated where required, and confirm secure terminal engagement at the distributor or coil and spark plugs. Standard Wires 55421 should be installed with attention to cylinder order and wire routing to avoid crossfire.

Quality Assurance

Standard Wires uses an OE-type core design and heat-resistant silicone construction to support consistent ignition performance and long-term durability in demanding underhood conditions.