Autolite 2544 Spark Plug

Autolite Copper Resistor Spark Plug 2544 Overview

Autolite Copper Resistor Spark Plug 2544 is an OE-style ignition replacement built for quick starts, smooth acceleration, and consistent fuel economy. It uses a copper center electrode, nickel tip materials, and a 5,000-ohm resistor to support stable spark performance in older Ford and Mercury applications.

The Autolite Copper Resistor Spark Plug line focuses on OE form, fit, and function for domestic and import vehicles. Part number 2544 is a practical choice for drivers servicing classic Ford Thunderbird, Ford Escort, Ford Ranger, Mercury Cougar, Mercury Lynx, and Mercury LN7 applications that call for a tapered-seat, 14 mm spark plug.

Key Features

• Copper center electrode for reliable ignition response
• 5,000-ohm resistor helps reduce electrical noise
• Nickel center and ground electrode tip materials
• Standard/regular center electrode design
• Extra-long ceramic insulator for stable plug construction
• 0.044 in. pre-gap size for listed applications
• 14.0 mm thread diameter with 5/8 in. hex size
• Tapered seat design

Detailed Product Description

Autolite 2544 is a copper resistor spark plug engineered around common OE specifications for older Ford and Mercury engines. The copper core supports dependable spark transfer, while the nickel electrode materials and tapered ground electrode tip design help maintain consistent combustion performance. With a 0.044 in. pre-gap, 14.0 mm thread diameter, 0.809 in. reach, and stud terminal type, this spark plug matches the requirements of the listed applications.

Fits 1989-1995 Ford Thunderbird, N/A; Fits 1989-1990 Mercury Cougar, N/A; Fits 1985-1986 Ford Escort, N/A; Fits 1983 Ford Escort, N/A; Fits 1985-1986 Mercury Lynx, N/A; Fits 1984-1985 Ford Escort, N/A; Fits 1984 Ford Ranger, N/A; Fits 1983-1984 Mercury Lynx, N/A; Fits 1983 Ford Ranger, N/A; Fits 1983 Mercury LN7, N/A. This part cross-references FEL-PRO 402 for the same application.

Common Issues This Spark Plug Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent ignition output
• Reduced throttle response during acceleration
• Misfire symptoms tied to aged plug electrodes
• Electrical interference concerns in resistor-equipped ignition systems

Installation Notes and Tips

Verify the vehicle’s required thread diameter, reach, seat type, and pre-gap before installation. For the listed Ford Thunderbird, Ford Escort, Ford Ranger, Mercury Cougar, Mercury Lynx, and Mercury LN7 applications, confirm the engine specification and compare the existing plug to the Autolite 2544 dimensions. Use proper spark plug service procedures and torque to the vehicle manufacturer’s specification.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, with a focus on OE-style fit and function. Part number 2544 is built to meet the dimensional and electrical requirements called out for the listed applications.