Denso 671-8171 Spark Plug Wire Set

Denso 671-8171 Ignition Wire Set

Denso First Time Fit ignition wire sets are built to match the original wire set in form, fit, color, and performance. This Denso 671-8171 spark plug wire set uses OE-style construction to support reliable ignition performance on select Chevrolet Express and GMC Savana applications.

Key Features

• 7mm insulation outside diameter for OE-style routing and fit
• Silicone spark plug boot material for heat resistance and flexibility
• 90-degree spark plug end boot for proper clearance at the plug
• Female spark plug end terminal type
• Female distributor/coil end terminal type
• Built to meet or exceed OE/OES standards in construction
• Direct replacement style for factory-installed ignition wire sets

Product Details

The Denso 671-8171 is a spark plug wire set engineered for vehicles that use a 7mm ignition wire design. It is listed for 2003-2007 Chevrolet Express 2500, 2003-2007 Chevrolet Express 3500, 2006-2007 Chevrolet Express 1500, 2003-2007 GMC Savana 2500, 2003-2007 GMC Savana 3500, 2006-2007 GMC Savana 1500, and 2004 GMC Envoy XL. The First Time Fit line focuses on matching the original wire set layout and terminal style so the replacement follows the factory configuration closely. Part number 671-8171 is also a useful reference when searching for OE-style ignition wire replacement for these applications.

This part cross-references ACDelco 748QQ and Bosch 09018 for the same application.

Common Problems This Part Can Address

• Misfires caused by worn or heat-damaged ignition wires
• Hard starting related to weak spark delivery
• Rough idle from deteriorated wire insulation or terminals
• Intermittent ignition performance from cracked or aged boots
• Voltage leakage across damaged wire routing

Installation Notes and Tips

Verify the terminal style, boot angle, and 7mm wire diameter before installation. Route each lead to match the original path and keep the wires separated from hot exhaust components and sharp edges. For best results, inspect spark plugs, coil connections, and distributor-related terminals at the same time to confirm the ignition system is in good condition. Confirm vehicle application by year, make, and model before ordering Denso 671-8171.

Quality Assurance

Denso First Time Fit ignition wire sets are manufactured to align with factory-installed specifications and are built to meet or exceed OE/OES standards for construction and performance.