Denso 671-6109 Spark Plug Wire Set

Denso 8mm Spark Plug Wire Set 671-6109

Denso 671-6109 is an 8mm 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 Ford applications, including Ford F-150, Ford E-150, and Ford E-250 models.

Key Features

• 8.00 mm insulation outside diameter for OE-style ignition wire construction
• Silicone spark plug boot material for heat resistance and flexible routing
• 115-degree angled spark plug end boot for tight engine bay routing
• Female spark plug end terminal type and female distributor/coil end terminal type
• Built to meet or exceed OE/OES standards for fit and performance
• Compatible With 2001-2003 Ford F-150, 2001-2002 Ford E-150 Econoline, 2001-2002 Ford E-150 Econoline Club Wagon, 2001-2002 Ford E-250 Econoline, 2003 Ford E-150, 2003 Ford E-150 Club Wagon, 2003 Ford E-250, and 2004 Ford F-150 Heritage

Product Details

Denso First Time Fit ignition wire sets are engineered as direct replacements for factory wire sets, with construction that follows OE/OES standards for form and performance. The 8mm design, silicone boots, and angled terminal layout support clean routing and secure connections in the ignition system. This part number, 671-6109, is a practical choice for Ford truck and van owners who need a replacement spark plug wire set that matches original specifications. This part cross-references ACDelco 16-836U and Bosch 09459 for the same application.

Common Issues This Part Helps Address

• Misfires caused by worn or heat-damaged ignition wires
• Hard starting related to weak spark delivery
• Rough idle from deteriorated wire insulation or boot wear
• Intermittent ignition performance from loose or aging terminal connections
• Routing problems in tight engine compartments where angled boots are required

Installation Notes and Tips

Verify engine application and wire routing before removal so each lead returns to the correct cylinder and coil or distributor terminal. Inspect plug wells, terminals, and adjacent ignition components for corrosion or carbon tracking before installing the new set. On Ford F-150, Ford E-150, and Ford E-250 applications, confirm that the 8mm wire specification matches the vehicle’s original setup.

Quality Assurance

Denso states that First Time Fit ignition wire sets are built to match factory-installed wire sets in form, fit, color, and performance, with construction that meets or exceeds OE/OES standards.