Denso 671-4003 Spark Plug Wire Set

Denso 7mm Ignition Wire Set for Toyota

Denso 671-4003 is a 7mm spark plug wire set built to match factory-installed wire sets in form, fit, color, and performance. It is a direct OE-style ignition wire replacement for select Toyota applications, including Toyota 4Runner, Pickup, Celica, and Corona models.

Key Features

• 7.00 mm insulation outside diameter for OE-style wire routing and fit
• Silicone spark plug boot material for heat resistance and durability
• 180-degree spark plug end boot for specific engine bay routing
• Female spark plug end terminal type
• Male distributor coil end terminal type
• Built to meet or exceed OE/OES standards
• Compatible With Toyota 4Runner, Toyota Pickup, Toyota Celica, and Toyota Corona applications

Product Details

The Denso First Time Fit line is engineered to mirror the original ignition wire set used on the vehicle, making Denso 671-4003 a practical replacement for aging or damaged ignition leads. This spark plug wire set uses silicone boot material and OE-style terminal configurations to support secure connections at the spark plug and distributor/coil ends. For buyers searching for a Toyota 4Runner spark plug wire set, Toyota Pickup ignition wire replacement, or Denso 671-4003 for Toyota Celica and Corona, this part matches the factory-style layout expected for these applications.

This part cross-references NGK (e.g., TX89, TX99A) for the same application.

Common Issues This Part May Address

• Misfires caused by worn or cracked ignition wires
• Hard starting related to weak spark delivery
• Rough idle from deteriorated wire insulation
• Intermittent ignition performance from loose or corroded terminals
• Heat-related boot damage in older Toyota ignition systems

Installation Notes and Tips

Verify wire routing before removal so each lead returns to the correct cylinder and terminal location. Inspect the distributor cap, coil connection, and spark plugs at the same time, since worn mating components can affect ignition performance. Confirm the boot angle and terminal style match the original setup before installation.

Quality Assurance

Denso First Time Fit ignition wire sets are manufactured to align with OE/OES standards and are intended to replicate the original part’s fit and performance characteristics.