Denso 3494 Spark Plug

Reliable Ignition Performance for Ford and Hyundai Vehicles

The Denso Iridium Long Life 3494 spark plug is engineered to provide consistent ignition and durability for select Ford and Hyundai models. Designed with advanced materials, this spark plug supports efficient combustion and long-term engine performance.

• Iridium center electrode tip for enhanced durability
• Platinum chip ground electrode tip design
• Copper core center electrode for optimal conductivity
• Standard ground configuration with nickel core ground electrode
• Pre-gap size of 0.8 mm for precise spark delivery
• Flat seat type with 14 mm thread diameter and 26.5 mm reach
• Hex size of 16 mm for easy installation
• Manufacturer heat range rating of 20
• Resistance of 5000 ohms to reduce electrical noise

About the Denso Iridium Long Life Spark Plug Line

The Iridium Long Life product line from Denso focuses on delivering extended service intervals and reliable ignition performance. Utilizing iridium for the center electrode tip, these spark plugs offer improved wear resistance compared to conventional plugs. The inclusion of a platinum chip on the ground electrode further enhances durability, making the 3494 part number suitable for vehicles requiring consistent ignition under varied driving conditions.

Technical Details and Compatibility

The Denso 3494 spark plug features a copper core center electrode that ensures excellent thermal conductivity and stable spark generation. The nickel core ground electrode with a platinum chip tip maintains electrode integrity over time. With a pre-gap size of 0.8 mm and a flat seat design, this spark plug fits securely and supports optimal combustion. Its 14 mm thread diameter and 26.5 mm reach are designed to meet OEM specifications for select Ford and Hyundai models, including the Ford Expedition, Ford F-150, and Hyundai Genesis Coupe.

Common Applications and Problem Solving

• Replacement for worn or fouled spark plugs in Ford Expedition and F-150 engines
• Improves ignition stability in Hyundai Genesis Coupe vehicles
• Addresses misfires caused by electrode wear or corrosion
• Helps reduce engine hesitation and rough idling
• Supports consistent spark delivery for better fuel efficiency

Installation Notes and Tips

Before installation, verify the spark plug gap is set to 0.8 mm if not pre-gapped. Use a torque wrench to tighten the spark plug to the manufacturer’s recommended specification to avoid damage. The 16 mm hex size allows for standard spark plug socket compatibility. Ensure the flat seat type matches the engine’s cylinder head design for proper sealing. It is advisable to inspect ignition wires and coils during replacement to maintain overall ignition system health.

Quality Assurance and Warranty

Denso spark plugs, including the Iridium Long Life 3494, are manufactured to meet strict OEM standards for fit, form, and function. The use of iridium and platinum materials contributes to extended service life and consistent performance. While specific warranty details may vary, Denso products typically come with a limited warranty covering defects in materials and workmanship.