Denso 671-4088 Spark Plug Wire Set

Denso 7mm Spark Plug Wire Set

Denso First Time Fit ignition wire sets are built to match the form, fit, color, and performance of the original factory wire set. This Denso 7mm spark plug wire set, part number 671-4088, is a direct OE-style replacement for select Volvo applications and is built to OE/OES standards or better.

Key Features

• 7mm insulation outside diameter for OE-style ignition wire routing and fit
• Silicone spark plug boot material for heat resistance and durability
• Female distributor coil end terminal type
• 180-degree spark plug end boot degree for proper connection geometry
• Female spark plug end terminal type
• Designed as a Denso First Time Fit ignition wire set

Product Details

The Denso 671-4088 spark plug wire set is engineered for Volvo 740, 745, 760, 780, and 940 models with 7mm ignition wire requirements. It is a practical OE replacement for drivers restoring ignition performance on 1985-1995 Volvo 740 and 760 series vehicles, plus 1989-1995 Volvo 780 and 940 applications listed below. The 7mm construction and silicone boots support secure terminal engagement and consistent ignition routing in factory-style layouts.

This part cross-references ACDelco 934B and NGK EUC019 for the same application.

Vehicle Fitment

• Fits 1994-1995 Volvo 940, N/A; Exc. Regina Ignition; 7mm
• Fits 1991-1993 Volvo 940, N/A; 7mm
• Fits 1985-1992 Volvo 740, N/A; 7mm
• Fits 1989-1991 Volvo 780, N/A; 7mm
• Fits 1985-1990 Volvo 760, N/A; 7mm
• Fits 1985 Volvo 745, N/A; 7mm

What It Helps Address

• Misfires caused by worn or heat-damaged ignition wires
• Hard starting related to weak spark delivery
• Rough idle from poor terminal contact or insulation breakdown
• Intermittent ignition performance on aging Volvo ignition systems
• Voltage leakage from cracked or deteriorated wire insulation

Installation Notes and Tips

Match each wire to the original routing before removal to avoid crossfire and heat exposure issues. Confirm the vehicle uses a 7mm ignition wire setup and verify the distributor and spark plug terminal style before installation. On 1994-1995 Volvo 940 models, confirm the vehicle is not equipped with Regina ignition.

Quality Assurance

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