Autolite AP5144 Spark Plug

Autolite Platinum Spark Plug AP5144 for OE-Style Ignition Service

Autolite Platinum Spark Plug AP5144 is built for drivers who need a direct-fit ignition service part with OE form, fit, and function. It uses a platinum center electrode and platinum tip to support easier starts, quicker acceleration, and improved fuel economy in the right applications.

This Platinum Spark Plug line is positioned as an OE-style replacement for foreign and domestic vehicles, giving you a practical option for routine ignition maintenance on Ford F-150, Ford Ranger, Ford Focus, and related applications.

Key Features

• Platinum center electrode and platinum tip for improved durability versus standard copper plugs
• Pre-gapped to 0.054 in. / 1.40 mm for listed applications
• Resistor type spark plug with 4000 resistance
• Nickel ground electrode with tapered tip design
• Ceramic extra-long insulator for ignition service applications
• 14.0 mm thread diameter, 20.5 mm reach, and 5/8 in. hex size
• OE-style replacement for a wide range of Ford and Mazda vehicles

Product Details

Autolite AP5144 is a platinum spark plug engineered around OE-style dimensions and ignition requirements. The stud terminal, tapered seat, and standard center electrode design support direct replacement service where this specification is called for. For fitment-specific applications, this part is listed for vehicles such as the 2008 Ford F-150, 2006-2008 Ford Ranger, 2000-2004 Ford Focus, and 2001-2007 Mazda B4000. This part cross-references AMS Automotive 4104 and Champion Spark Plug 407 for the same application.

Common Issues This Part Helps Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from aged ignition components
• Slower throttle response in high-mileage tune-ups
• Reduced fuel economy linked to degraded spark performance
• Misfire concerns when replacing worn OE-style plugs

Installation Notes and Tips

• Verify the vehicle-specific gap before installation; listed applications include 0.054 in. / 1.40 mm and some notes call for 0.044 in. / 1.1 mm or 0.052 in. / 1.3 mm.
• Confirm thread diameter, reach, seat type, and terminal style match the engine specification before service.
• Use the fitment notes for each vehicle, especially on Ford F-150, Ford Escort, Ford Thunderbird, and Mercury Tracer applications.
• Follow the manufacturer’s torque specification for the engine being serviced.

Quality Assurance

Autolite supplies ignition products for automotive aftermarket and original equipment applications, with a focus on OE-style fit and function across a broad vehicle range. AP5144 is built to meet the dimensional and performance requirements listed for the supported Ford and Mazda applications.