Autolite AP5143 Spark Plug

Reliable Ignition Performance for Ford, Land Rover, Mazda, and Mercury Vehicles

The Autolite Platinum Spark Plug AP5143 is engineered to deliver consistent ignition performance for select Ford, Land Rover, Mazda, and Mercury models. Designed with durable materials and precise specifications, this spark plug supports efficient combustion and engine reliability.

• Platinum center electrode tip and core for enhanced durability
• Tapered ground electrode tip made of nickel for stable spark
• Extra-long ceramic insulator for improved heat dissipation
• Resistor type with 4000 ohms resistance to reduce electrical noise
• Standard center electrode design with a 0.054 inch (1.40 mm) pre-gap size
• Thread diameter of 14.0 mm and reach of 0.809 inch (20.5 mm)
• Hex size 16 mm (5/8 inch) for easy installation
• Compatible with stud-type electrical terminals

About the Autolite Platinum Spark Plug Line

The Platinum Spark Plug line from Autolite focuses on combining platinum materials in both the center electrode tip and core to provide longer service life and consistent spark delivery. This line is designed to meet the ignition demands of modern engines, offering improved wear resistance compared to conventional spark plugs. The AP5143 model benefits from these features, making it suitable for vehicles requiring reliable secondary ignition components.

Technical Details and Compatibility

The AP5143 spark plug features a tapered seat type and a single ground electrode constructed from nickel, which contributes to stable spark generation and combustion efficiency. The extra-long ceramic insulator enhances heat control, reducing the risk of pre-ignition and fouling. With a resistor value of 4000 ohms, this spark plug helps minimize electromagnetic interference with vehicle electronics.

This spark plug is compatible with various Ford, Land Rover, Mazda, and Mercury models, including the Ford B4000, Escort, Explorer, Explorer Sport Trac, Mountaineer, Mustang, Ranger, as well as the Land Rover LR3 and Lynx. The AP5143 part number ensures precise fitment and performance for these vehicles.

Common Applications and Problem Solving

• Restores proper ignition in engines experiencing misfires
• Reduces engine hesitation and rough idling
• Improves fuel efficiency by ensuring complete combustion
• Prevents spark plug fouling and premature wear
• Minimizes electrical interference affecting vehicle sensors

Installation Notes and Tips

• Verify compatibility with your vehicle’s make and model before installation
• Use a 16 mm (5/8 inch) socket wrench for proper torque application
• Check and adjust the spark plug gap to 0.054 inch (1.40 mm) if necessary
• Apply anti-seize compound on threads to prevent galling
• Ensure the spark plug is seated properly with the tapered seat for optimal sealing

Quality Assurance and Warranty

Autolite manufactures the AP5143 spark plug to meet industry standards for ignition components. The use of platinum electrodes and high-quality ceramic insulators supports durability and consistent performance. While specific warranty details are not provided here, Autolite products typically come with manufacturer-backed quality assurance to ensure reliability in compatible vehicles.