NGK 3306 Spark Plug - Exhaust Side

NGK Iridium IX Spark Plug 3306 Overview

NGK Iridium IX Spark Plug 3306 is built for drivers who need a precise OE-style ignition component with iridium center electrode technology and a 5,000 ohm resistor. This plug is a direct service option for a wide range of import and domestic applications, including select Toyota Supra, Toyota Camry, Honda Prelude, and Nissan Sentra models.

The NGK Iridium IX line focuses on stable ignition performance, consistent spark delivery, and long-term durability in everyday driving and maintenance service.

Key Features

• Iridium center electrode tip material for fine-wire spark delivery
• Copper center electrode core for efficient heat transfer
• Nickel ground electrode core with taper-cut tip design
• 5,000 ohm resistor for ignition noise suppression
• Pre-gapped to .044 inch
• 14 mm thread diameter, .75 inch reach, flat seat
• 5/8 inch hex size with non-removable nut terminal
• Manufacturer heat range 5

Product Details

Part number 3306, also identified as BCPR5EIX-11, is part of NGK’s Iridium IX Spark Plug line. NGK is a long-established OE supplier with broad coverage across automotive, motorcycle, marine, and small engine applications, and this plug reflects that OE-focused manufacturing approach. The iridium tip supports consistent ignition performance, while the copper core and nickel ground electrode help manage heat and durability in service. This part cross-references Monroe Shocks & Struts (e.g., 5601) for the same application.

Compatible With select 1985-1989 Toyota Corolla, 1986-1992 Toyota Supra, 1987-1991 Toyota Camry, 1988-1991 Honda CRX, 1988-1990 Honda Prelude, 1989-1990 Nissan Sentra, and 1998-2000 Mercedes-Benz SLK230 applications. Part number 3306 is also a service match for additional Toyota, Honda, Nissan, Acura, Chevrolet, Ford, and Mercury vehicles listed in the fitment data.

Common Issues This Spark Plug Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent ignition firing
• Misfire conditions related to plug wear or incorrect gap
• Reduced throttle response from weak spark delivery
• Ignition noise concerns in resistor-equipped systems

Installation Notes and Tips

Verify the vehicle application before installation and confirm the specified gap for the engine. The plug is supplied at .044 inch pre-gap, but several listed applications note a required adjustment to 0.044 inch or 0.039 inch depending on the vehicle. Use the correct torque procedure for the cylinder head material and inspect ignition wires or coils during service. For dual-plug applications such as the Nissan 200SX exhaust-side listing, follow the vehicle-specific service requirements exactly.

Quality Assurance

NGK manufactures spark plugs to OE standards and supports broad North American coverage through established manufacturing and distribution operations. The 3306 Iridium IX Spark Plug is built for consistent fitment, dependable service life, and repeatable ignition performance across the listed applications.