Denso 671-4146 Spark Plug Wire Set

Denso 671-4146 Ignition Wire Set

The Denso 671-4146 spark plug wire set is built for direct replacement on select Toyota applications, including the 1994-1997 Toyota T100, 1995-1997 Toyota Tacoma, and 1996 Toyota 4Runner. It follows factory-style form, fit, color, and performance for a straightforward OE-style ignition service.

Key Features

• Direct-fit spark plug wire set for select Toyota ignition systems
• 5mm insulation outside diameter for OE-style routing and fitment
• Sil PBT Sil boot material for durable terminal and boot construction
• 90-degree spark plug end boot for tight engine bay routing
• Female spark plug end terminal type with male distributor/coil end terminal
• Built to meet or exceed OE/OES standards according to Denso

Product Details

Denso First Time Fit ignition wire sets are engineered to match the original wire set in form, fit, color, and performance. The 5mm design supports the original routing layout on Toyota T100, Tacoma, and 4Runner applications, while the 90-degree spark plug boots help maintain proper clearance at the plug end. Part number 671-4146 is a practical OE-style replacement when restoring ignition wire integrity on these vehicles. This part cross-references ACDelco 964B and Bosch 09391 for the same application.

Common Problems This Part Can Address

• Misfires caused by worn or damaged ignition wires
• Hard starting related to weak spark delivery
• Rough idle from deteriorated wire insulation or terminals
• Intermittent ignition performance from poor boot contact
• Routing issues when replacing aged factory-style wire sets

Installation Notes and Tips

Verify cylinder-to-wire routing before removal and replace one wire at a time when possible to preserve firing order. Inspect spark plug and distributor/coil terminals for corrosion, carbon tracking, or heat damage before installation. Confirm the 5mm wire layout and 90-degree spark plug boot orientation match the original setup on your Toyota T100, Tacoma, or 4Runner.

Quality Assurance

Denso states that this First Time Fit wire set is manufactured to OE/OES-level standards for construction and performance. The 671-4146 is intended as a factory-style replacement for select Toyota ignition systems.