Karlyn 721 Spark Plug Wire Set

Karlyn-STI 721 Spark Plug Wire Set

The Karlyn-STI 721 spark plug wire set is built with OEM boot type and OEM engine application details for a direct-fit ignition service part. Finished in blue, it is a practical choice for Land Rover Discovery and Range Rover models that use screw-on coil terminals.

Key Features

• OEM boot type for factory-style terminal engagement
• Blue wire set for easy visual identification in the engine bay
• OEM engine application details for the listed Land Rover fitments
• Direct replacement part number 721 for ignition wire service
• Fits with PN 5059 coil packs as noted for the application

Fitment and Application

Compatible With 1999-2004 Land Rover Discovery, N/A, with screw-on coil terminals and use in conjunction with PN 5059 coil packs. Compatible With 1999-2002 Land Rover Range Rover, N/A, with screw-on coil terminals and use in conjunction with PN 5059 coil packs. The Karlyn-STI 721 is listed for these Land Rover ignition applications and is identified by part number 721 for service matching.

What It Helps Address

• Cracked or worn spark plug wire insulation
• Misfire conditions caused by degraded ignition wire performance
• Hard starting related to weak spark delivery
• Intermittent ignition connection at screw-on coil terminals
• Service replacement needs for Land Rover Discovery and Range Rover ignition systems

Installation Notes

Verify the vehicle uses screw-on coil terminals before ordering. This wire set is specified for use with PN 5059 coil packs, so confirm coil pack part numbers and routing before installation. Match each lead to the original routing path to maintain proper ignition wire separation and terminal engagement.

Quality Assurance

Karlyn-STI identifies this ignition wire set as an OEM-style service component for the listed Land Rover applications. Part number 721 is cataloged for direct application matching on Discovery and Range Rover models with the specified terminal style.