Denso 3377 Spark Plug

Denso Iridium Long Life Spark Plug 3377

Denso 3377 is an Iridium Long Life spark plug built for OE-level performance, durability, and emissions control. It is a direct-fit ignition component for a wide range of Honda, Acura, Dodge, Ram, Jeep, and Ram applications, including Honda Civic, Honda Accord, and Honda CR-V fitments.

Key Features

• Iridium center electrode tip for stable spark performance and long service life
• Platinum chip ground electrode tip design for consistent ignition characteristics
• Copper center electrode core and nickel ground electrode core for efficient heat transfer
• 5000 ohm resistance for ignition system compatibility
• Pre-gapped to 1.1 mm for OE-style installation
• 14.00 mm thread diameter, 19.00 mm reach, and flat seat design
• 16.0 mm hex size for standard service tooling
• Manufacturer heat range 20

Product Details

The Denso Iridium Long Life line is engineered for drivers who want a spark plug that follows original equipment performance targets without changing the factory ignition setup. Part number 3377 uses an iridium center electrode tip, a platinum chip ground tip, and a thick-electrode ground configuration to support reliable combustion and steady engine response. Denso 3377 is manufactured to meet strict OE standards for performance, durability, and emissions, making it a practical choice for maintenance on vehicles such as Honda Accord, Honda Civic, and Acura TL applications.

This part cross-references DENSO Auto Parts SKJ20DR-M11 for the same application.

What It Helps Address

• Rough idle caused by worn spark plugs
• Hard starting from weakened ignition output
• Misfire conditions related to plug wear or gap growth
• Reduced fuel economy from inconsistent spark delivery
• Loss of throttle response during acceleration

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. This spark plug is pre-gapped to 1.1 mm, but the gap should still be checked against the vehicle service specification before use. Use the correct 16.0 mm spark plug socket and follow the manufacturer torque specification for the engine. Confirm the exact engine application for Honda CR-V, Honda Accord, Honda Civic, Acura MDX, Acura TL, Acura TSX, and related fitments before service.

Quality Assurance

Denso manufactures this spark plug to OE performance, durability, and emissions standards. The 3377 part number is built as an OE-style replacement for maintenance on supported Honda, Acura, Dodge, Ram, and Jeep applications.