2021 Spark Plug Wires Buying Guide
Some of the most common signs of worn spark plug wires include an illuminated Check Engine
light or ignition problems such as hesitation, misfires, reduced power, rough idling or surging.
Test leads with a multimeter to indicate whether plug wires or other car parts are the cause of a
problem. This guide will point you towards the best replacement wires for spark plugs for your
Signs Of Worn Spark Plugs and Wires
Damaged or worn out spark plugs and wires can cause ignition problems. Check the leads for
indications of cracked or scorched wires, corrosion or faulty springs. A spark that fails to quickly
ignite the mixture of air and fuel in the combustion chamber may result in rough idling or an
engine that will not start.
You can verify that wires connected to spark plugs are faulty by testing ignition leads with an
Ohm meter or multimeter. Disconnect each spark plug wire for testing and reconnect each wire
afterward to avoid reconnecting these cables out of order. Place the probes of the multimeter on
the metal connectors of each ignition lead. It may be possible to replace a single faulty wire, but
two or more faulty wires will require replacement all of the plug wires.
How To Choose Your Between Spark Plug Wire Brands
You may prefer to install wires made by the original equipment manufacturer or boost
performance by using upgraded aftermarket wires. It is not necessary to match the brands of
spark plugs and wires. If you are not sure which parts come standard in a vehicle, check the
owner’s manual or use a VIN decoder.
It is important to keep in mind that many newer vehicles use a coil on plug design and do not
have plug wires. If your vehicle has plug wires, you can upgrade these components to improve
performance. Leading brands specialize in making plug wires that have low resistance and
superior pull strength and can withstand exposure to automotive solvents and high temperatures.
Why To Replace Spark Plugs and Wires
Worn spark plugs or wires can result in ignition problems. Over time, a vehicle may experience
poor combustion, low mileage and misfires. The worst problems caused by wear and tear on
these parts may include voltage leaks to nearby engine parts that can cause electrical arcing,
major component failures and performance problems.
The owner’s manual for your vehicle will make a recommendation for the frequency with which to
change out plug wires. Most manufacturers recommend changing wires between 60,000 and
100,000 miles. It is also a good idea to switch out spark plugs in sets, as these components
should match and have comparable levels of electrical resistance for smooth engine operation.
If your vehicle is experiencing ignition problems and you have ruled out the spark plugs, plug
wires could be the source of the problem. It is worthwhile to test the resistance of plug wires to
ensure that these are the components that require replacement. A plug wire set or spool of wire
can restore the function of plug wires.