Denso 4706 Spark Plug

Denso Iridium TT 4706 Spark Plug

Denso Iridium TT 4706 is an OE-style spark plug built for drivers who want dependable ignition performance with a focus on durability, power, and torque. Its twin-tip design combines an iridium center electrode with a platinum ground tip to support consistent spark delivery across a wide range of applications, including BMW 750iL, Mercedes-Benz E320, and Toyota Corolla fitments.

Key Features

• Iridium center electrode tip for stable ignition performance
• Platinum twin-tip ground electrode design for extended service life
• Copper center electrode core and nickel ground electrode core
• 5000 ohm resistance for standard ignition system operation
• Flat seat design with 14.00 mm thread diameter and 19.00 mm reach
• Pre-gapped at 1.0 mm for direct replacement use
• Part number 4706 for easy catalog matching

Product Details

The Denso Iridium TT line is engineered to blend OE-style durability with performance-focused ignition characteristics. This spark plug uses a 0.4 mm iridium center electrode and a platinum twin-tip ground electrode layout to promote efficient spark formation and consistent combustion. The result is a practical replacement choice for older import and domestic vehicles where reliable starting, smooth idle quality, and steady throttle response matter. This part cross-references DENSO Auto Parts IQ16TT for the same application.

Compatible With applications such as 1999-2002 Saturn SL2, 1986-1992 Toyota Supra, and 1994-1995 Mercedes-Benz E320, this plug also appears in fitments for BMW, Honda, Nissan, Saab, and Geo models. If you are searching for Denso 4706 spark plug fitment for Toyota Corolla, Mercedes-Benz E320, or BMW 750iL applications, this listing provides the core specifications needed for a direct replacement decision.

Common Issues It Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition output
• Misfire symptoms related to aged secondary ignition components
• Reduced throttle response from degraded spark quality
• Maintenance replacement for high-mileage ignition service

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. The listed pre-gap is 1.0 mm, but final gap should always be checked against the vehicle service specification. Clean the plug seat area, thread the plug by hand first to avoid cross-threading, and confirm the ignition system is in good condition before final assembly. Some applications, including certain Mercedes-Benz E320 configurations, may require vehicle-specific service procedures.

Quality Assurance

Denso manufactures this Iridium TT spark plug as an OE-style replacement part with performance-oriented electrode materials and a durable twin-tip design. The construction is intended to support long-term ignition consistency in demanding daily-driver and maintenance applications.