Denso 671-4040 Spark Plug Wire Set

Reliable Spark Plug Wire Set for Chevrolet, GMC, and Isuzu Vehicles

The Denso 7mm Spark Plug Wire Set (Part Number 671-4040) is designed to provide consistent ignition performance for Chevrolet S10, GMC Sonoma, and Isuzu Hombre models. Engineered with durable silicone boots and precise terminal configurations, this set ensures efficient spark delivery and reliable engine operation.

Key Features of the Denso 671-4040 Spark Plug Wire Set

• Silicone spark plug boot material for enhanced heat resistance and durability
• 7.00 mm insulation outside diameter for optimal electrical insulation
• 180-degree spark plug end boot angle to fit tight engine compartments
• Female spark plug end terminal type and male distributor coil end terminal type for secure connections
• Includes four straight spark plug end boots for complete wire set replacement

Detailed Description of the Denso 7mm Spark Plug Wire Set

This spark plug wire set from Denso’s 7mm product line is engineered to meet the specific ignition requirements of Chevrolet S10, GMC Sonoma, and Isuzu Hombre vehicles. The 7mm insulation diameter balances flexibility and electrical insulation, reducing the risk of crossfire and misfires. Silicone boots provide resistance to heat, oil, and chemicals, extending the life of the wires under demanding engine conditions. The 180-degree spark plug end boot design allows for easier installation in confined spaces, while the combination of female spark plug terminals and male distributor coil terminals ensures a secure and reliable connection throughout the ignition system.

Applications and Common Issues Addressed

• Replacement for worn or damaged spark plug wires causing engine misfires
• Improves ignition system reliability in Chevrolet S10, GMC Sonoma, and Isuzu Hombre
• Prevents electrical interference and crossfire between ignition wires
• Restores proper spark delivery to maintain engine performance and fuel efficiency
• Addresses issues related to cracked or brittle spark plug boots

Installation Notes and Tips

• Ensure engine is cool before removing old spark plug wires
• Replace wires one at a time to maintain correct firing order
• Verify that the 180-degree spark plug end boots align properly with spark plugs
• Check for secure connections at both spark plug and distributor coil ends
• Inspect boots and terminals for damage before installation

Quality Assurance and Warranty Information

Denso’s 7mm spark plug wire sets are manufactured to meet OEM specifications for fit, form, and function. The use of high-quality silicone boots and precise terminal construction supports long-term durability and consistent ignition performance. While specific warranty details may vary, Denso products typically come with a limited warranty against defects in materials and workmanship to ensure customer confidence.