Bosch 7404 Spark Plug

Reliable Bosch Nickel Spark Plug for BMW, Saab, Suzuki, Volkswagen

The Bosch Nickel Spark Plug part number 7404 is engineered to deliver consistent ignition performance for select BMW, Saab, Suzuki, and Volkswagen models. Designed with durable materials and precise specifications, this spark plug supports efficient combustion and engine reliability.

• Resistance: 6000 ohms for optimal electrical noise suppression
• Ground Electrode Tip Design: Multiple for enhanced spark distribution
• Ground Electrode Quantity: 2 for improved ignition stability
• Pre-Gap Size: 1 mm for precise spark gap
• Hex Size: 16 mm for standard installation tools
• Manufacturer Heat Range: 8 suitable for moderate to high engine temperatures
• Seat Type: Flat for secure mounting
• Reach: 19 mm ensuring proper fit in combustion chamber
• Thread Diameter: 14 mm compatible with specified vehicle engines
• Center Electrode Core Material: Nickel-yttrium and copper for durability and conductivity
• Insulator Material: Ceramic with projected insulator type for heat resistance
• Resistor: Yes, to reduce electromagnetic interference

About the Bosch Nickel Product Line

The Bosch Nickel line focuses on spark plugs that utilize nickel-based electrode materials, providing a balance of durability and reliable ignition performance. This line is designed to meet the ignition requirements of various 4-cycle engines, including those found in BMW, Saab, Suzuki, and Volkswagen vehicles. The use of nickel-yttrium and copper in the center electrode enhances conductivity and wear resistance, making the Nickel series suitable for everyday driving conditions.

Technical Details and Compatibility

The Bosch 7404 spark plug features a dual ground electrode design with multiple tip configurations, which helps maintain consistent spark delivery and combustion efficiency. Its 1 mm pre-gap size and 19 mm reach ensure proper ignition timing and fitment in engines such as the BMW 325i, 328i, 525i, Saab 900 and 9000, Suzuki Forenza, and Volkswagen Passat and Corrado. The flat seat type and 14 mm thread diameter align with OEM specifications for these models.

Common Applications and Problem Solving

• Restores engine misfire issues in BMW 328is and Saab 9000
• Improves cold start performance in Volkswagen EuroVan and Passat
• Reduces ignition noise and interference in Suzuki Forenza
• Maintains consistent spark for smooth acceleration in BMW Z3
• Supports efficient fuel combustion in Volkswagen Corrado and Golf models

Installation Notes and Tips

When installing the Bosch 7404 spark plug, ensure the engine is cool to prevent thread damage. Use a torque wrench to tighten the spark plug to manufacturer specifications, typically around 20-25 Nm. Verify the pre-gap size of 1 mm before installation, adjusting if necessary. The 16 mm hex size allows for standard spark plug sockets. Avoid over-tightening to maintain the integrity of the flat seat and prevent sealing issues.

Quality Assurance and Warranty

Bosch spark plugs, including the Nickel 7404, are manufactured to meet strict quality standards for durability and performance. The resistor built into the spark plug reduces electromagnetic interference, protecting vehicle electronics. While specific warranty details may vary, Bosch products generally come with a limited warranty covering defects in materials and workmanship under normal use.