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 Capri Spark Plug Wire
28 itemsMisfires, rough idle, or weak acceleration can start with aging ignition wires. Replace your spark plug wires set to help deliver steady spark and restore smoother engine performance.
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Walker ProductsPart # 924-1373
Walker Products 924-1373 Spark Plug Wire Set
4.73 Reviews
$44.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1986-1987 Ford Thunderbird, 1985-1985 Ford Thunderbird, 1985-1985 Ford Thunderbird, 1985-1985 Ford Thunderbird, 1985-1985 Ford Thunderbird, 1985-1985 Ford Thunderbird, 1984-1987 Mercury Cougar, 1984-1986 Ford LTD, 1984-1986 Mercury Marquis, 1984-1984 Ford Thunderbird, 1983-1986 Ford Mustang, 1983-1986 Mercury Capri
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Mercury Capri
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1373, 35-6161, 2980, 9077, 26646, L-6851, CB-106, 35-87615,
...View moreitem #1001PT8R
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Walker ProductsPart # 924-1024
Walker Products 924-1024 Spark Plug Wire Set
4.73 Reviews
$39.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1976-1978 Mazda Cosmo, 1974-1978 Mazda RX-4, 1974-1977 Mazda Rotary Pickup, 1972-1978 Mazda RX-3, 1971-1974 Mazda RX-2, 1971-1973 Fiat 124, 1971-1972 Mercury Capri, 1970-1972 Mazda R100, 1970-1970 Fiat 124, 1970-1970 Mercury Capri, 1969-1971 Fiat 850, 1968-1969 Fiat 124, 1967-1968 Fiat 850, 1964-1967 Fiat 1500, 1962-1967 Fiat 600D, 1960-1962 Fiat 1500, 1960-1961 Fiat 600
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Mercury Capri
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1024, 8181, ME51, ZX99B, 4680, 4760, 9198, 9287,
...View moreitem #1001PQZ0
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Walker ProductsPart # 924-1396
Walker Products 924-1396 Spark Plug Wire Set
4.73 Reviews
$69.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1973-1973 Ford M-400, 1972-1974 Lincoln Mark IV, 1972-1972 Ford F-250, 1972-1972 Ford F-350, 1972-1972 Ford Gran Torino, 1972-1972 Ford P-350, 1971-1973 Ford F-100, 1971-1973 Ford F-100, 1971-1973 Ford F-250, 1971-1973 Ford F-250, 1971-1973 Ford F-350, 1971-1973 Ford F-350, 1971-1973 Ford P-350, 1971-1972 Mercury Comet, 1971-1971 Ford Country Sedan, 1971-1971 Ford Country Squire, 1971-1971 Ford Custom, 1971-1971 Ford Custom 500, 1971-1971 Ford Galaxie 500, 1971-1971 Ford LTD
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Mercury Capri
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1396, 35-8194, 2801, 9165, 9167, 106, 109, 4840,
...View moreitem #1001PP8Q
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Walker ProductsPart # 924-1162
Walker Products 924-1162 Spark Plug Wire Set
4.73 Reviews
$35.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1974-1974 Ford Mustang II, 1974-1974 Ford Pinto, 1974-1974 Mercury Capri, 1964-1967 Ford Anglia, 1962-1964 Ford Capri, 1962-1964 Ford Consul
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Mercury Capri
Item LocatedUnited States
QuantityOne Set
Part interchange
924-1162, 35-4149, 2410, 9111, 205, 29430, 35-77210, 4195,
...View moreitem #1001PQA2
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A-Premium®Part # APSPW469
6 Pcs Spark Plug Wire Set for Ford Escort Mercury Tracer 1991-1996 Capri Mazda 323
4.660 Reviews
$43.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1991 - 1996 Ford Escort, 1991 - 1996 Mercury Tracer, 1991 - 1994 Mercury Capri, 1990 - 1994 Mazda Protege, 1988 - 1989 Mazda 323
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Mercury Capri
Item LocatedUnited States
Quantity6
ConditionNew
item #1013DXUL
Note
【Note-1】 For 1990-1994 Mazda Protege fits the model with L4 1.8L DOHC. NOT SOHC.
【Note-2】 For 1988-1989 Mazda 323 fits the model with L4 1.6L Turbocharged, NOT Naturally Aspirated.
【Note-2】 For 1988-1989 Mazda 323 fits the model with L4 1.6L Turbocharged, NOT Naturally Aspirated.
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DensoPart # 671-6071
Spark Plug Wire Set - Denso 671-6071
51 Reviews
$43.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1983-1983 Ford LTD, 1983-1983 Mercury Marquis, 1982-1982 Mercury Cougar, 1981-1982 Ford Granada, 1980-1982 Ford Thunderbird, 1980-1982 Mercury Cougar, 1979-1982 Ford Mustang, 1979-1982 Mercury Capri, 1978-1983 Ford Fairmont, 1978-1983 Mercury Zephyr, 1977-1980 Ford Granada, 1977-1980 Mercury Monarch, 1977-1977 Ford Granada, 1977-1977 Ford Maverick, 1977-1977 Ford Maverick, 1977-1977 Mercury Comet, 1977-1977 Mercury Comet, 1977-1977 Mercury Monarch
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Mercury Capri
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 # 671-4051
Spark Plug Wire Set - Denso 671-4051
51 Reviews
$50.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1989-1989 Ford Ranger, 1986-1987 Ford Aerostar, 1984-1986 Mercury Cougar, 1983-1988 Ford Ranger, 1983-1988 Ford Ranger, 1983-1988 Ford Thunderbird, 1983-1986 Ford LTD, 1983-1986 Mercury Marquis, 1981-1982 Ford Granada, 1981-1981 Mercury Cougar, 1980-1980 Ford Pinto, 1980-1980 Mercury Bobcat, 1979-1990 Ford Mustang, 1979-1986 Mercury Capri, 1978-1983 Ford Fairmont, 1978-1983 Mercury Zephyr, 1977-1979 Ford Pinto, 1977-1979 Mercury Bobcat, 1977-1978 Ford Mustang II, 1977-1977 Mercury Capri
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Mercury Capri
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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DensoPart # 671-4013
Spark Plug Wire Set - Denso 671-4013
51 Reviews
$34.99
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 1976-1978 Mazda Cosmo, 1974-1978 Mazda RX-4, 1974-1977 Mazda Rotary Pickup, 1972-1978 Mazda RX-3, 1972-1973 Mercury Capri, 1972-1972 Mercury Capri, 1971-1974 Mazda RX-2, 1971-1973 Fiat 124, 1971-1971 Fiat 124, 1970-1972 Mazda R100, 1970-1971 Mercury Capri, 1970-1970 Fiat 124, 1969-1971 Fiat 850, 1968-1969 Fiat 124, 1968-1969 Fiat 124, 1968-1968 Fiat 850, 1967-1968 Fiat 850, 1967-1968 Fiat 850, 1964-1967 Fiat 1500, 1962-1967 Fiat 600D
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Mercury Capri
Item LocatedUnited States
QuantityOne Set
Part interchange
671-4013, 104013, 35-4013, 125, 6714013, ZE97A, 96929, 175-2781,
...View moreitem #1002HU34
Show less
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!