Denso 3478 Spark Plug

Overview of Denso Iridium Long Life (SIP) Spark Plug 3478

The Denso Iridium Long Life (SIP) spark plug, part number 3478, is engineered for reliable ignition performance in select Hyundai and Kia vehicles. Designed with advanced materials and precise specifications, this spark plug supports efficient combustion and consistent engine operation.

• Iridium center electrode tip for enhanced durability
• Platinum needle ground electrode tip design
• Needle-to-needle ground configuration for precise spark delivery
• Copper center electrode core for optimal conductivity
• Flat seat type with 26.50 mm reach and 12.00 mm thread diameter
• Pre-gap size of 1.1 mm for accurate ignition timing
• Hex size of 16.0 mm for standard installation tools
• Manufacturer heat range rating of 16
• Resistance value of 5000 ohms to reduce electrical noise

Detailed Features and Specifications

This Denso spark plug features an iridium center electrode tip, known for its high melting point and wear resistance, which contributes to longer service life and stable ignition. The ground electrode uses a platinum needle tip in a needle-to-needle configuration, enhancing spark precision and combustion efficiency. The copper core in the center electrode improves thermal conductivity, helping to dissipate heat effectively. With a flat seat type and a reach of 26.50 mm, this spark plug fits securely in the combustion chamber, ensuring proper sealing and performance. The 1.1 mm pre-gap size is factory set to optimize spark timing and engine responsiveness. Additionally, the 5000 ohm resistance helps minimize electromagnetic interference with vehicle electronics.

About the Iridium Long Life (SIP) Product Line

The Iridium Long Life (SIP) line from Denso focuses on delivering extended durability and consistent ignition performance through the use of iridium and platinum materials. This product line is designed to meet the demands of modern engines by providing stable spark delivery and resistance to electrode wear, which helps maintain engine efficiency over time. Part number 3478 is a representative spark plug within this line, tailored for specific Hyundai and Kia models.

Compatible Vehicles and Applications

• Hyundai Optima
• Hyundai Santa Fe Sport
• Hyundai Sonata
• Kia Sorento
• Kia Sportage
• Kia Tucson

This spark plug is suitable for secondary ignition systems in these vehicles, supporting smooth engine starts and consistent combustion cycles.

Common Issues Addressed by Denso Spark Plug 3478

• Engine misfires due to worn or damaged spark plugs
• Reduced fuel efficiency from incomplete combustion
• Difficulty starting the engine in cold conditions
• Rough idling or hesitation during acceleration
• Increased emissions caused by inefficient ignition

Installation Notes and Tips

When installing the Denso 3478 spark plug, ensure the engine is cool to prevent damage to the threads. Use a torque wrench to tighten the spark plug to the manufacturer’s recommended specification to avoid over-tightening or under-tightening. Verify the pre-gap size of 1.1 mm before installation, although it is factory set. The 16.0 mm hex size allows for compatibility with common spark plug sockets. Proper installation will help maintain optimal engine performance and longevity.

Quality Assurance and Warranty

Denso spark plugs, including part number 3478, are manufactured to meet strict quality standards and undergo rigorous testing to ensure reliability and performance. While specific warranty details may vary, Denso products typically come with a limited warranty covering defects in materials and workmanship. Refer to the vehicle manufacturer or Denso documentation for exact warranty terms.