Fire every cylinder in the 3.8L V6 that powered Ford and Mercury rear-drivers with the Autolite Copper Spark Plug 2546. It's cataloged as a direct-fit replacement for the 1984-1986 Ford LTD, 1984-1986 Ford Mustang, 1984-1987 Ford Thunderbird, 1984-1986 Mercury Capri, 1984-1987 Mercury Cougar and 1984-1986 Mercury Marquis, all with the V6-3.8L engine, which uses six plugs per application.
- Copper-core center electrode: aids thermal control and improves resistance to fouling.
- High-nickel-alloy center and ground electrode: designed to provide extended service life.
- High-alumina multi-rib ceramic insulator: provides thermal conductivity and insulation for added strength.
- Nickel-plated shell: corrosion resistant for added durability.
This is a resistor-type plug rated at 5,000 ohms to help suppress radio-frequency interference. It carries a standard, long-projection center electrode, a single standard ground electrode, an M14-1.25 metric thread (14 mm diameter), a 5/8-inch hex and a tapered seat. It arrives pre-gapped to 0.054 in (1.4 mm) with a heat range of 7; washers are not included. Country of origin: China. Backed by a 2-year limited warranty. Manufacturer part number 2546.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
Which vehicles does the Autolite 2546 fit?
It's a direct-fit replacement for the 1984-1986 Ford LTD, Mustang, Mercury Capri and Marquis, plus the 1984-1987 Ford Thunderbird and Mercury Cougar, all with the V6-3.8L engine. See the Buyer's Guide tab to confirm your vehicle.
Is this a resistor spark plug?
Yes. It is a resistor-type plug with 5,000 ohms of resistance, which helps suppress radio-frequency interference.
Does it come pre-gapped, and is a washer included?
It ships pre-gapped to 0.054 in (1.4 mm) and uses a tapered seat, so no washer is included. Verify the gap against your engine's specification before installing.
How many plugs do I need for my engine?
The listed V6-3.8L applications use six plugs each. This plug is sold individually, so order the quantity your engine requires.
What are the thread and hex sizes?
It has an M14-1.25 metric thread with a 14 mm diameter, a 5/8-inch hex, a tapered seat and a heat range of 7.
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