Bosch 9748 Spark Plug

Reliable Ignition Performance for Dodge, Jeep, Mitsubishi, and Ram

The Bosch OE Fine Wire Iridium spark plug 9748 is engineered to deliver consistent ignition and efficient combustion for select Dodge, Jeep, Mitsubishi, and Ram models. Designed with advanced materials and precise specifications, this spark plug supports optimal engine performance and durability.

• Part Number: 9748
• Brand Line: OE Fine Wire Iridium
• Resistance: 6000 ohms for noise suppression
• Ground Electrode Tip: Standard design with platinum and nickel-yttrium-copper materials
• Center Electrode Tip: Platinum-iridium for enhanced durability
• Ground Electrode Core: Copper for improved conductivity
• Pre-Gap Size: 0.8 mm
• Thread Diameter: 14 mm with 26.5 mm reach
• Hex Size: 16 mm for standard installation tools
• Insulator: Projected ceramic type for reliable insulation
• Manufacturer Heat Range: 7, suitable for a range of engine conditions

OE Fine Wire Iridium Technology

The OE Fine Wire Iridium line from Bosch features spark plugs with fine wire electrodes made from iridium and platinum alloys. This combination provides a balance of long service life and stable ignition performance. The use of nickel-yttrium and copper in the electrode cores enhances conductivity and heat dissipation, making the 9748 spark plug a precise fit for secondary ignition systems in 4-cycle engines.

Technical Details and Compatibility

This spark plug is designed with a flat seat type and a single ground electrode, ensuring consistent spark delivery. The 6000 ohm resistor built into the plug helps reduce electromagnetic interference with vehicle electronics. With a thread diameter of 14 mm and a reach of 26.5 mm, it fits securely in the combustion chamber. The projected ceramic insulator improves voltage insulation and heat resistance.

Compatible Vehicles and Applications

• Dodge Ram 1500
• Dodge Challenger and Charger
• Jeep Grand Cherokee and Durango
• Mitsubishi Eclipse, Galant, Lancer, and Outlander

Common Issues Addressed by Bosch 9748 Spark Plug

• Engine misfires and rough idling
• Poor fuel efficiency due to incomplete combustion
• Difficulty starting the engine
• Reduced engine power and acceleration
• Excessive exhaust emissions

Installation Notes and Tips

Before installation, verify the spark plug gap is set to 0.8 mm as specified. Use a 16 mm socket wrench for proper torque application. Avoid over-tightening to prevent thread damage. It is recommended to replace spark plugs in sets to maintain balanced engine performance. Ensure the engine is cool before installation to avoid damage to the cylinder head.

Quality Assurance and Warranty

Bosch OE Fine Wire Iridium spark plugs are manufactured to meet OEM specifications, ensuring reliable performance and durability. The use of premium materials such as platinum-iridium and copper cores supports long service life. While specific warranty details may vary, Bosch products typically come with a limited warranty against manufacturing defects.