NGK 4772 Spark Plug

NGK Iridium IX Spark Plug for Diablo

The NGK Iridium IX Spark Plug, part number 4772, is built for precise ignition performance in applications that call for a 12 mm, flat-seat plug with a 0.75 reach. It is listed for 1992-1996 Lamborghini Diablo models and should be gapped to 0.032 inches during service.

Key Features

• NGK Iridium IX Spark Plug line for performance-focused ignition service
• Iridium center electrode tip material for stable spark delivery
• Copper center electrode core with nickel ground electrode core
• 5000 ohm resistance for ignition system noise control
• Taper-cut ground electrode tip design with standard ground configuration
• 12.00 mm thread diameter, 18 mm hex size, flat seat, and .75 reach
• Manufacturer heat range 9 and pre-gap size of .032
• Fits 1992-1996 Lamborghini Diablo, N/A

Detailed Description

NGK part number 4772, also identified as DR9EIX, is an Iridium IX spark plug engineered around NGK’s long-standing OE manufacturing background. The iridium center electrode supports consistent ignition performance, while the nickel ground electrode and taper-cut tip design help maintain a focused spark path. For Lamborghini Diablo owners servicing the ignition system, this plug matches the listed fitment and specifications for 1992-1996 models.

This part cross-references DENSO Auto Parts (e.g., 5363, 5373) for the same application.

What It Is Used For

• Replacing worn spark plugs that cause rough idle
• Addressing hard starting related to weak ignition output
• Correcting misfire conditions tied to plug wear or gap drift
• Restoring consistent combustion in high-performance ignition systems
• Maintaining proper spark delivery in Lamborghini Diablo service work

Installation Notes and Tips

Verify the plug gap is set to 0.032 inches before installation. Confirm the 12 mm thread diameter, flat seat, 0.75 reach, and heat range 9 match the engine specification before service. Use the listed fitment for 1992-1996 Lamborghini Diablo, N/A, and follow the vehicle manufacturer’s ignition service procedure.

Quality Assurance

NGK is a major OE spark plug supplier with extensive North American manufacturing and distribution support. The brand’s OE-focused production standards and broad application coverage support consistent part quality for ignition service.