Champion 3346 Spark Plug - Intake Side

Champion Platinum Power Spark Plug 3346

Champion Platinum Power spark plug 3346 is built for steady ignition performance across a wide range of import and domestic applications. It uses a platinum center electrode, a nickel ground electrode core, and Champion’s Heat-Active alloy to help deliver a focused spark and consistent combustion.

With OE-style dimensions and a resistor design, this plug is a direct-service replacement for many vehicles, including Toyota Corolla, Honda CR-Z, and Subaru Legacy applications that call for RC10PYC/RC12PYC-style fitment references.

Key Features

• Champion Platinum Power line for secondary ignition service
• Platinum center electrode tip for durable spark delivery
• Heat-Active alloy construction for stable performance
• Fine-wire center electrode and V-trimmed ground electrode for sharp spark focus
• Resistor type plug for ignition system noise control
• Flat seat design with 14 mm thread diameter and 0.75 in reach
• Pre-gapped at 0.046 in for service-ready installation

Detailed Description

Champion 3346 is a platinum spark plug from the Platinum Power line, engineered for vehicles that require a flat-seat, resistor-style plug with a 0.625 in hex. The platinum tip helps maintain electrode durability, while the nickel ground electrode core supports reliable ignition service over time. This part cross-references Monroe Shocks & Struts (e.g., 5664) for the same application.

Fitment coverage includes many Toyota Camry, Toyota Prius, Hyundai Sonata, Kia Sorento, Mitsubishi Lancer, and Subaru Outback applications. It also appears in long-tail searches such as Champion 3346 spark plug for 2009-2012 Toyota Corolla, Champion Platinum Power plug for 2011-2016 Honda CR-Z, and replacement spark plug for 2010-2012 Subaru Legacy.

What It Helps Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent spark delivery
• Misfire conditions tied to aged secondary ignition components
• Reduced throttle response from degraded plug performance
• Maintenance replacement for OE-style ignition service

Installation Notes and Tips

Verify the required plug type, gap, and seat style before installation. This plug is listed with a 0.046 in pre-gap, but several vehicle applications in the fitment data specify different gap settings, including 0.040 in, 0.043 in, 0.044 in, 0.050 in, and 0.052 in. Always confirm the vehicle-specific specification before use. Check thread reach, hex size, and terminal style against the original plug to ensure proper fit.

For best results, inspect ignition coils, plug wires, and cylinder head threads during service. Use the vehicle manufacturer’s torque specification when installing spark plugs.

Quality Assurance

Champion Platinum Power plugs are built around Champion’s Heat-Active alloy and a fine-wire electrode design to support consistent spark focus and dependable ignition service. Part number 3346 is cataloged for broad vehicle coverage and OE-style replacement use.