Autolite AP104 Spark Plug

Autolite Platinum Spark Plug AP104

Autolite Platinum Spark Plug AP104 is an OE-style replacement spark plug built for consistent ignition performance across a wide range of Ford, Lincoln, Mercury, Mazda, Cadillac, Buick, and other applications. With a platinum center electrode and a 0.050 in. pre-gap, it supports easier starts, quicker throttle response, and improved fuel economy compared with standard copper plugs.

Platinum Spark Plug Features

• Platinum center electrode tip and core material for added durability
• 0.050 in. / 1.30 mm pre-gap for OE-style service fitment
• 5,000 ohm resistor design for ignition noise suppression
• Tapered ground electrode tip with nickel core and nickel tip material
• Ceramic insulator with mid-projection design
• 14 mm thread diameter, 5/8 in. hex, tapered seat, and stud terminal

Product Line Overview

The Autolite Platinum Spark Plug line is positioned as an OE-form, fit, and function replacement for many domestic and import vehicles. AP104 follows that approach with a platinum firing tip for longer service life than standard copper designs, while maintaining the dimensions and seat style needed for factory-style ignition service.

Detailed Description

Autolite AP104 is a direct-fit platinum spark plug for many high-volume applications, including Ford Mustang, Ford F-150, Ford Ranger, Ford Focus, Lincoln Town Car, and Mazda Tribute models. It is also listed for numerous Buick, Cadillac, Mercury, and Mazda vehicles where OE-style gap and thread specifications are required. This part cross-references Bosch 7426 for the same application.

Built with a platinum center electrode and a tapered ground electrode, AP104 is engineered to maintain stable spark delivery and resist wear over extended service intervals. The resistor design helps reduce electrical interference, while the ceramic insulator supports consistent heat and electrical isolation.

Common Issues This Spark Plug Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent ignition firing
• Reduced acceleration response from weak spark delivery
• Fuel economy loss related to degraded plug performance
• Misfire symptoms tied to excessive electrode wear

Installation Notes and Fitment Tips

Verify the required gap before installation and compare the vehicle’s OE specification to the plug’s pre-gap. Fits 2013-2014 Ford Mustang, N/A; Fits 2011-2013 Ford E-150, N/A; Fits 2004-2009 Ford F-150, N/A; Fits 2006-2011 Buick Lucerne, N/A; Fits 2006-2011 Cadillac DTS, N/A; Fits 2005-2011 Ford Focus, N/A; Fits 2008-2011 Mazda Tribute, N/A; Fits 1999-2007 Ford Taurus, N/A. Always confirm engine-specific requirements and gap notes in the vehicle service information before installation.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, and AP104 is built to OE-style form, fit, and function standards for broad vehicle coverage.