What Does A Spark Plug Do
Spark plugs can make or break your engine’s performance. Understand how they work, how to recognize a faulty one, and get expert advice on choosing the right spark plug for better engine health.
Jul 21, 2026
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Mercury Cougar Spark Plug Wire
45 itemsShop precise fit replacement Spark Plug Wire to maintain and improve your vehicle's performance. Find the right parts for your make and model, backed by excellent customer service at A-Premium.
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Walker ProductsPart # 924-1443
Walker Products 924-1443 Spark Plug Wire Set
4.73 Reviews
$61.99
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3-year warranty
90 days free return
Fits 1991-1993 Ford Thunderbird, 1991-1993 Mercury Cougar
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Vehicle: Mercury Cougar
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1443, 35-8171, 2998, 9087, 160, 26879, L-6137, L-6311,
...View moreitem #1001PS20
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Walker ProductsPart # 924-1439
Walker Products 924-1439 Spark Plug Wire Set
4.73 Reviews
$58.99
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3-year warranty
90 days free return
Fits 1984-1985 Ford LTD, 1984-1988 Ford Thunderbird, 1985-1987 Ford Bronco, 1985-1987 Ford E-150 Econoline, 1985-1987 Ford E-150 Econoline Club Wagon, 1985-1987 Ford E-250 Econoline, 1985-1987 Ford F-150, 1985-1987 Ford F-250, 1988-1989 Ford LTD Crown Victoria, 1988-1991 Ford Country Squire, 1990-1991 Ford LTD Crown Victoria, 1984-1985 Lincoln Continental, 1984-1985 Lincoln Mark VII, 1984-1989 Lincoln Town Car, 1986-1987 Lincoln Continental, 1986-1987 Lincoln Mark VII, 1990-1990 Lincoln Town Car, 1984-1985 Mercury Grand Marquis, 1984-1988 Mercury Cougar, 1986-1986 Mercury Grand Marquis
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Mercury Cougar
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1439, 2972, 9089, 8HY-2972, 9086, 9087, 9088, L-6017,
...View moreitem #1001PSSN
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DensoPart # 671-6071
Spark Plug Wire Set - Denso 671-6071
51 Reviews
$43.99
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3-year warranty
90 days free return
Fits 1977-1977 Ford Granada, 1977-1977 Ford Maverick, 1977-1977 Ford Maverick, 1977-1980 Ford Granada, 1978-1983 Ford Fairmont, 1979-1982 Ford Mustang, 1980-1982 Ford Thunderbird, 1981-1982 Ford Granada, 1983-1983 Ford LTD, 1977-1977 Mercury Comet, 1977-1977 Mercury Comet, 1977-1977 Mercury Monarch, 1977-1980 Mercury Monarch, 1978-1983 Mercury Zephyr, 1979-1982 Mercury Capri, 1980-1982 Mercury Cougar, 1982-1982 Mercury Cougar, 1983-1983 Mercury Marquis
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Vehicle: Mercury Cougar
Item LocatedUnited States
QuantityOne Set
Part interchange
671-6071, 35-6158, MSW1286, 6716071, 16-816A, 11-611M, 2X1295, QW827,
...View moreitem #100318PL
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DensoPart # 671-4058
Spark Plug Wire Set - Denso 671-4058
51 Reviews
$53.99
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3-year warranty
90 days free return
Fits 1995-1998 Ford Contour, 1998-1999 Ford Escort, 1998-1999 Ford Escort, 1998-1999 Ford Escort, 1998-1999 Ford Escort, 1999-1999 Ford Contour, 1999-2000 Ford Escort, 2000-2002 Ford Escort, 1995-1998 Mercury Mystique, 1999-1999 Mercury Mystique, 1999-2002 Mercury Cougar
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Mercury Cougar
Item LocatedUnited States
QuantityOne Set
Part interchange
671-4058, 35-4020, 741, MSW1864, 6714058, FDZ046, 52099, 16-814U,
...View moreitem #1002HXP9
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DensoPart # 671-4051
Spark Plug Wire Set - Denso 671-4051
51 Reviews
$50.99
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3-year warranty
90 days free return
Fits 1977-1978 Ford Mustang II, 1977-1979 Ford Pinto, 1978-1983 Ford Fairmont, 1979-1990 Ford Mustang, 1980-1980 Ford Pinto, 1981-1982 Ford Granada, 1983-1986 Ford LTD, 1983-1988 Ford Ranger, 1983-1988 Ford Ranger, 1983-1988 Ford Thunderbird, 1986-1987 Ford Aerostar, 1989-1989 Ford Ranger, 1977-1977 Mercury Capri, 1977-1979 Mercury Bobcat, 1978-1983 Mercury Zephyr, 1979-1986 Mercury Capri, 1980-1980 Mercury Bobcat, 1981-1981 Mercury Cougar, 1983-1986 Mercury Marquis, 1984-1986 Mercury Cougar
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Mercury Cougar
Item LocatedUnited States
QuantityOne Set
Part interchange
671-4051, 267, 35-4130, MSW1810, 6714051, 16-814H, 11-4076M, 2X1288,
...View moreitem #1002HVWK
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What are spark plug wires?
Spark plug wires, also known as ignition cables or spark plug leads, are a set of wires that connect the ignition coil or distributor to the spark plugs in an internal combustion engine. They are responsible for transmitting high-voltage electrical energy from the ignition source to the spark plugs, which ignite the fuel-air mixture in the engine's cylinders.
The spark plug wires typically consist of a central core made of conductive materials such as copper, and an insulating layer made of materials like silicone or rubber to prevent electrical current from leaking. The wires are designed to withstand high temperatures and electrical interference and are often color-coded to ensure correct installation.
Signs of bad spark plug wires
Spark plug wires play a crucial role in ensuring reliable engine performance. Worn or damaged spark plug wires can cause misfires, rough idling, and poor fuel efficiency, so it's important to take regular maintenance and replace them as needed.
Engine knocking
When the spark plug wires fail, the engine may produce a knocking sound, particularly under heavy loads. This can be caused by pre-ignition or detonation, which can occur when the spark plug wires are not delivering enough energy to the spark plugs.
Rough shifting (automatic transmission)
In some cases, a damaged spark plug wire can cause rough shifting in an automatic transmission. This can be due to a drop in engine power caused by misfires or other problems related to the spark plug wires.
Burned spark plug wires
If you notice that your spark plug wires are discolored or burned, this can be a sign that they are not functioning properly. Burned spark plug wires can be caused by excessive heat, electrical interference, or other issues.
Poor acceleration
When the spark plug wires are failing, the engine may have trouble accelerating smoothly. This can be due to misfires or other problems related to the spark plug wires.
Stalling
A damaged spark plug wire can cause the engine to stall or cut out, particularly at idle. This can be due to a drop in engine power caused by misfires or other problems related to the spark plug wires.
How to change spark plug wires?
Replacing a spark plug wire set is a relatively simple task, and can usually be completed in under an hour. You can follow these steps:
1. Remove the worn or faulty spark wire set.
To avoid confusion and prevent accidentally switching the wires, it is recommended to replace each spark plug wire individually, starting with the longest one. When removing the wires from either the spark plug or distributor cap, it is important to loosen the connection by twisting or rotating the boot. Yanking or forcefully pulling on the wires may cause them to break. Only pull on the boot and refrain from pulling on the cable.
2. Install the new spark plug wire set
Install the new spark plug wires in the same location as the old wires, making sure to connect each wire to the correct spark plug. If your new spark plug wires have boots, be sure to push the boot firmly onto the spark plug until it clicks into place.
3. Test the new spark plug wires
Once you have installed the new spark plug wires, start the engine and check for any signs of misfires, rough idling, or other problems that could indicate an issue with the spark plug wires. If everything looks good, you're all set!