NGK 8178 Spark Plug Wire Set

NGK Spark Plug Wire Set for Ford and Mazda

NGK Spark Plug Wire Set 8178 is a specific-fit ignition wire set built for select 1993-1997 Ford Probe, Mazda 626, and Mazda MX-6 applications. It uses blue silicone insulation, a noise-suppression design, and a Mag (Var. Pitch) core to support stable spark delivery and reduced electrical interference.

Key Features

• Specific-fit NGK spark plug wire set for confirmed vehicle applications
• Blue silicone insulation for heat resistance and durability
• Noise suppression design to help reduce ignition interference
• Mag (Var. Pitch) core material for consistent ignition performance
• 7.00 mm insulation outside diameter
• NGK part number 8178 / RC-ZX40

Product Details

NGK Spark Plug Wire Set 8178 is part of NGK Spark Plug Wire Set line, backed by more than 80 years of automotive ignition experience and OE-focused manufacturing. NGK builds ignition components to meet OE standards for durability and operational performance, with product coverage for domestic and import vehicles. This wire set is a direct-fit replacement for 1993-1997 Ford Probe, 1993-1997 Mazda 626, and 1993-1997 Mazda MX-6 models, making it a practical choice when servicing aging ignition wiring on these platforms. This part cross-references DENSO Auto Parts 671-4223 for the same application.

Common Issues This Part Can Address

• Misfires caused by worn or heat-damaged plug wires
• Hard starting related to weak ignition transfer
• Rough idle from deteriorated wire insulation
• Electrical noise affecting ignition system operation
• Loss of spark consistency under load

Installation Notes and Tips

Verify engine configuration and wire routing before installation. Match each lead to the correct cylinder and coil or distributor terminal, and inspect boots, terminals, and adjacent ignition components for wear before reassembly. For best results, replace damaged wires as a complete set on the confirmed application and route them away from hot or moving engine parts.

Quality Assurance

NGK manufactures ignition products with OE-level durability and performance standards in mind. Part number 8178 is built as a specific-fit replacement for the listed Ford and Mazda applications.