Autolite AP404 Spark Plug

Autolite Platinum Spark Plug AP404

Autolite AP404 is a platinum spark plug for a wide range of classic and older gasoline applications. It is listed for direct fitment across many Volkswagen, Honda Civic, and Chevrolet models, with application-specific gap requirements shown in the fitment data.

Key Features

• Platinum spark plug construction for ignition service in older engine applications.
• Application-specific gap listings help match the plug to the correct tune-up specification.
• Fits a broad range of vintage import and domestic vehicles.
• Compatible With classic Volkswagen Vanagon, Honda Civic, and Chevrolet truck and car applications.
• Part number AP404 for catalog and service reference.

Detailed Description

AP404 is an Autolite platinum spark plug built for many legacy vehicles that use conventional secondary ignition service parts. The fitment data includes applications such as Fits 1980-1983 Honda Civic, N/A, Fits 1976-1978 Honda Accord, N/A, and Fits 1967-1969 Chevrolet Camaro, N/A, along with numerous other classic import and domestic models. Because the listed applications span different engine families and eras, the correct gap and reach notes in the fitment table should be matched to the exact vehicle entry. The AP404 part number is also useful when cross-checking service records or ordering by catalog reference.

What It Is Used For

• Replacing worn spark plugs that cause rough idle.
• Restoring ignition performance after misfire complaints.
• Addressing hard starting in older carbureted engines.
• Correcting fouling or weak spark conditions during tune-up service.
• Maintaining proper combustion in vehicles specified for AP404.

Installation Notes and Tips

Verify the exact year, make, model, and gap specification before installation. Use the fitment notes to confirm reach and gap requirements, especially on older applications where specifications vary by engine and production year. Always inspect the ignition system, set the plug gap to the listed value, and torque to the vehicle manufacturer’s specification. AP404 should be matched only to the applications shown in the fitment data.

Quality Assurance

Autolite is a long-established ignition brand with broad coverage in replacement spark plugs. AP404 is cataloged as a platinum spark plug for service use in many classic applications, and the part number AP404 helps ensure correct identification during ordering and maintenance.