Autolite 2546 Spark Plug

Reliable Ignition with Autolite Copper Resistor Spark Plug 2546

The Autolite Copper Resistor Spark Plug 2546 is engineered to provide consistent ignition performance for select Ford and Mercury vehicles. Designed with durable materials and precise specifications, this spark plug supports efficient combustion and engine reliability.

• Resistance: 5000 ohms for effective electrical noise suppression
• Center electrode made of copper core with nickel tip for balanced conductivity and durability
• Tapered ground electrode tip and seat for optimal spark exposure
• Extra-long ceramic insulator for enhanced heat dissipation
• Pre-gap size of 0.054 inches (1.40 mm) for precise spark gap
• Standard/regular center electrode design with a single nickel ground electrode
• Thread diameter of 14.0 mm and reach of 0.809 inches (20.5 mm)
• Hex size 5/8 inch (16 mm) with stud-type electrical terminal

About the Copper Resistor Spark Plug Product Line

The Autolite Copper Resistor Spark Plug line combines copper core electrodes with resistor technology to reduce radio frequency interference while maintaining reliable ignition. The 2546 model features a tapered ground electrode and extra-long ceramic insulator, designed to meet the ignition needs of classic Ford and Mercury models. This product line balances conductivity and durability for steady engine performance.

Detailed Product Description

The Autolite 2546 spark plug incorporates a copper core center electrode with a nickel tip, providing efficient heat transfer and consistent spark generation. The tapered ground electrode tip and seat design optimize spark exposure to the combustion chamber, improving ignition reliability. The resistor type spark plug with 5000 ohms resistance helps minimize electrical noise that can interfere with vehicle electronics. Its extra-long ceramic insulator enhances heat dissipation, reducing the risk of fouling and pre-ignition. The plug’s thread diameter and reach are tailored for proper fitment in Ford and Mercury engines, including models such as the Mustang, Thunderbird, Capri, Cougar, LTD, and Marquis.

Compatible Vehicles and Common Applications

• Ford Mustang ignition system maintenance
• Mercury Cougar spark plug replacement
• Resolving misfires in Ford Thunderbird engines
• Improving combustion efficiency in Mercury Capri
• Replacement for worn spark plugs in Ford LTD and Marquis

Installation Notes and Tips

• Ensure the spark plug gap is set to 0.054 inches (1.40 mm) before installation
• Use a 5/8 inch (16 mm) socket for proper torque application
• Apply anti-seize compound on threads if recommended by vehicle manufacturer
• Check for proper reach (0.809 inches / 20.5 mm) to avoid engine damage
• Verify stud-type terminal compatibility with ignition wires

Quality Assurance and Warranty

Autolite spark plugs are manufactured to meet OEM specifications for fit, form, and function. The Copper Resistor Spark Plug 2546 undergoes rigorous quality control to ensure consistent performance and durability. While specific warranty details may vary, Autolite products typically come with a limited warranty against manufacturing defects. Consult vehicle and product documentation for exact warranty terms.