Autolite 414 Spark Plug

Autolite 414 Copper Spark Plug Overview

Autolite 414 is a copper non-resistor spark plug built for quick starts, steady idle quality, and smooth throttle response. It is an OE-style replacement for a wide range of foreign and domestic applications, including common Honda Civic and Toyota Corolla service needs where a standard copper plug is specified.

The Autolite Copper Non-Resistor Spark Plug line focuses on OE form, fit, and function with a value-oriented design for everyday ignition service. Part number 414 follows that approach with a standard regular center electrode, nickel tip materials, and a flat seat for direct replacement use in the correct application.

Key Features

• Copper center electrode core for reliable ignition performance
• Non-resistor design for applications that call for a resistor-free plug
• Nickel center and ground electrode tip materials
• Tapered ground electrode tip design for consistent spark exposure
• Pre-gapped to 0.025 in. / 0.60 mm
• 14 mm thread diameter, 0.500 in. reach, and 13/16 in. hex size
• Flat seat with ceramic short insulator construction

Detailed Description

Autolite 414 spark plug is engineered as a direct OE-style replacement for engines that specify a copper, non-resistor plug with a flat seat and 0.500-inch reach. The nickel-tipped center and ground electrodes support stable spark delivery, while the removable nut terminal provides broad ignition wire compatibility in the correct fitment. For routine tune-ups on vehicles such as Honda Civic and Toyota Corolla, part number 414 offers the standard dimensions and ignition characteristics expected from a conventional copper plug.

This part cross-references Champion Spark Plug 306 for the same application.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent ignition firing
• Reduced throttle response during acceleration
• Misfire conditions related to aged plugs
• Fuel economy loss from inefficient combustion

Installation Notes and Tips

Verify the engine calls for a 14 mm, flat-seat spark plug with a 0.500-inch reach before installation. Check the specified gap for the application and confirm the ignition wire or coil terminal matches the removable nut terminal style. Use the vehicle service manual for torque and replacement interval guidance, especially when servicing Honda Civic or Toyota Corolla ignition systems.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, with spark plugs built to OE-style form, fit, and function. Part number 414 is manufactured to support dependable everyday service in the correct application.