NGK 8109 Spark Plug Wire Set

NGK Spark Plug Wire Set for OE-Style Ignition Service

The NGK Spark Plug Wire Set 8109 is a specific-fit ignition wire set built for direct replacement service on select Mercury Villager and Nissan Quest applications. It uses blue silicone insulation, a magnetic variable-pitch core, and noise suppression construction to support stable spark delivery and reduced electrical interference.

NGK Spark Plug Wire Set products reflect NGK’s long OE-focused ignition experience, with manufacturing standards aimed at durability and consistent operational performance for domestic and import vehicles. Part number 8109 is also referenced as RC-NX04.

Key Features

• Specific-fit spark plug wire set for select applications
• Blue silicone insulation for heat resistance and flexibility
• Magnetic variable-pitch core for ignition performance
• Noise suppression construction to help reduce radio-frequency interference
• 7.00 mm insulation outside diameter
• Direct replacement part number 8109 / RC-NX04

Detailed Description

Built for ignition service on 1993-1998 Mercury Villager and 1993-1998 Nissan Quest, this NGK wire set is engineered to match the vehicle-specific routing and electrical requirements of the original application. The silicone insulation helps protect the wires in demanding underhood conditions, while the mag (variable pitch) core supports reliable spark transfer. For shoppers searching for a 1993-1998 Nissan Quest spark plug wire set or a 1993-1998 Mercury Villager ignition wire replacement, NGK 8109 provides a direct-fit solution.

NGK’s ignition product line includes spark plugs, glow plugs, ignition coils, coil-on-plug boots, and wire sets, backed by extensive OE experience and global manufacturing support. This part cross-references Bosch 8109 for the same application.

What It Helps Solve

• Misfires caused by worn or heat-damaged plug wires
• Hard starting related to weak spark delivery
• Ignition noise that can affect radio or electronic operation
• Cracked insulation from age, heat, or vibration
• Uneven engine performance from deteriorated wire resistance

Installation Notes and Tips

Verify the vehicle application before installation and route each lead to match the original layout. Inspect spark plugs, coil connections, and boots at the same time to avoid repeat ignition issues. Confirm the wire set is seated fully at each terminal and kept clear of hot exhaust components and moving parts.

Quality Assurance

NGK manufactures premium ignition components to OE-level durability and performance standards. Part number 8109 is a specific-fit replacement for select Mercury Villager and Nissan Quest models, with construction intended to support dependable ignition service.