Autolite 404 Spark Plug

Autolite 404 Copper Resistor Spark Plug

The Autolite 404 is a copper resistor spark plug built for OE-style form, fit, and function across a wide range of foreign and domestic applications. It is engineered for quick starts, smooth acceleration, and consistent ignition performance in classic Chevrolet, Honda Civic, Volkswagen Vanagon, and other compatible vehicles.

Key Features

• Copper center electrode for dependable ignition response
• Nickel center and ground electrode tip materials
• 5000 ohm resistor design for ignition noise suppression
• 0.034 in. pre-gap size
• Flat seat with 14.0 mm thread diameter and 0.750 in. reach
• Ceramic insulator with short insulator type
• Removable nut terminal for common ignition wire setups
• OE-style replacement for a broad range of applications

Product Details

Autolite Copper Resistor Spark Plugs are part of the Autolite Copper Spark Plug line, which focuses on OE-style replacement performance at a value-oriented price point. The 404 uses a standard/regular center electrode design, a tapered ground electrode tip, and a nickel ground electrode core to support stable spark delivery. For buyers searching for an Autolite 404 spark plug for Honda Civic, Volkswagen Vanagon spark plug replacement, or classic Chevrolet ignition service, this part number is a direct match for many listed applications.

This part cross-references Champion Spark Plug 120 for the same application.

Common Uses

• Restoring weak spark or inconsistent ignition on older engines
• Replacing worn plugs that contribute to hard starting
• Addressing rough idle or hesitation during acceleration
• Reducing ignition noise in resistor-equipped systems
• Servicing OE-style ignition setups on classic Chevrolet, Honda, and Volkswagen models

Installation Notes

Verify thread diameter, reach, seat type, and terminal style before installation. The listed pre-gap is 0.034 in. / 0.90 mm, but several vehicle applications in the fitment data specify different OE-style gap requirements, including 0.028 in., 0.030 in., 0.032 in., 0.035 in., 0.040 in., and 0.044 in. Set the gap to the vehicle specification before use. Confirm compatibility for your exact engine and ignition system when ordering an Autolite 404 spark plug.

Compatible With 1980-1983 Honda Civic, 1975-1979 Honda Civic, 1976-1978 Honda Accord, 1983 Honda Prelude, 1989 Volkswagen Vanagon, 1980-1983 Volkswagen Vanagon, 1966-1969 Chevrolet Bel Air, 1963 Chevrolet Bel Air, 1969 Chevrolet Blazer, 1967-1969 Chevrolet C10 Suburban, 1967-1969 Chevrolet C20 Suburban, 1967-1969 Chevrolet Camaro, 1966-1969 Chevrolet Caprice, 1969 Chevrolet Corvette, 1966-1969 Chevrolet Impala, 1963 Chevrolet Impala, 1969 Chevrolet K10 Suburban, 1967 Chevrolet K10 Suburban, 1967-1969 Chevrolet K20 Suburban, 1969 Chevrolet Nova, 1968-1969 Pontiac Acadian, 1966-1969 Pontiac Laurentian, 1966-1969 Pontiac Parisienne, 1966-1967 Chevrolet Malibu, 1963 GMC G1000 Series, 1956-1958 Bentley Continental, and 1952-1955 Bentley Continental.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, and this spark plug is built to OE form, fit, and function standards for listed applications. The 404 part number is supported by established interchange references and fitment data for a wide range of vehicles.