Denso 671-8143 Spark Plug Wire Set

Denso 671-8143 Spark Plug Wire Set

Denso 671-8143 is a First Time Fit spark plug wire set built to match the form, fit, color, and performance of the original factory wire set. It is a direct replacement for select Lexus LS400 and Lexus SC400 applications, with OE-style construction focused on consistent ignition transfer and proper terminal fit.

Key Features

• First Time Fit design for OE-style replacement on select Lexus ignition systems
• 5mm insulation outside diameter for a factory-style wire profile
• Sil PBT Sil spark plug boot material for durable insulation and terminal support
• 105-degree spark plug end boot angle for routing in tight engine bays
• Female spark plug end terminal type with male distributor/coil end terminal type
• Built to meet or exceed OE/OES standards in construction and performance

Product Details

This Denso 5mm spark plug wire set is engineered for direct-fit service on 1990-1997 Lexus LS400 and 1992-1997 Lexus SC400 models. The 671-8143 part number is a practical choice when replacing aging ignition wires that can affect spark delivery, idle quality, and overall engine smoothness. Denso’s First Time Fit line is positioned as an OE-style replacement line, making it a strong match for drivers who want factory-like routing and terminal configuration without changing the original ignition layout.

This part cross-references ACDelco 908H and NGK TE119 for the same application.

What It Helps Address

• Misfires caused by worn or heat-damaged ignition wires
• Hard starting related to weak spark transfer
• Rough idle from inconsistent wire resistance or terminal wear
• Engine hesitation under load on Lexus LS400 and Lexus SC400 models
• Intermittent ignition performance from cracked insulation or poor boot sealing

Installation Notes and Tips

Verify wire routing against the original layout before removal, especially on the 105-degree boot ends. Confirm the male distributor/coil end and female spark plug end terminal types match the vehicle’s ignition connection points. For best results, inspect adjacent ignition components for wear before installing the new wire set on your Lexus LS400 or Lexus SC400.

Quality Assurance

Denso First Time Fit ignition wire sets are manufactured to OE/OES-level standards for form, fit, color, and performance. The 671-8143 is built as a direct replacement option for factory-style service on compatible Lexus applications.