Denso 4707 Spark Plug

Denso Iridium TT Spark Plug 4707

Denso Iridium TT 4707 is a spark plug built for OE-style durability with a focus on stronger power delivery and torque response. It combines an iridium center electrode with a twin-tip ground design to support consistent ignition performance in a wide range of import and luxury applications.

Key Features

• Iridium center electrode tip for stable spark performance
• Platinum twin-tip ground electrode design for efficient ignition
• Copper center electrode core and nickel ground electrode core
• 5000 ohm resistance for ignition system compatibility
• Flat seat design with 14.00 mm thread diameter and 19.00 mm reach
• Pre-gapped at 1.0 mm
• Compatible with select Jaguar, Volvo, Mercedes-Benz, Saab, Toyota, Honda, Mazda, Nissan, and other applications

Product Details

The Denso Iridium TT line is engineered to combine the durability expected from an OE-style spark plug with the sharper throttle response and torque characteristics associated with performance-focused ignition components. Part number 4707 uses an iridium center electrode for precise spark delivery, while the twin-tip ground configuration helps maintain efficient combustion over time. This makes it a practical choice for drivers servicing vehicles such as the Jaguar XJ8, Volvo S80, and Mercedes-Benz S500, where ignition consistency matters for smooth operation.

This part cross-references DENSO Auto Parts IQ20TT for the same application.

Common Issues This Spark Plug Can Address

• Rough idle caused by worn or inconsistent spark plugs
• Hard starting related to weak ignition output
• Misfire symptoms from degraded electrode wear
• Reduced throttle response from inefficient combustion
• Loss of fuel economy tied to aging secondary ignition components

Installation Notes and Tips

• Verify thread diameter, reach, seat type, and heat range before installation.
• Confirm the 1.0 mm pre-gap matches the vehicle specification.
• Some applications, including select Mercedes-Benz E320 and ML320 listings, note two spark plugs per cylinder in the fitment data.
• Use the vehicle service manual for torque and service interval guidance.
• Check coil boots and ignition wires during spark plug replacement to avoid repeat misfire concerns.

Quality Assurance

Denso manufactures this Iridium TT spark plug as an OE-style replacement with materials selected for long service life and stable ignition performance. Part number 4707 is listed across multiple import and European applications, including 1984-2003 Nissan 300ZX, 1988-1991 Honda Civic, and 1998-2003 Jaguar XJ8 fitments.