Updated at: 14-03-2022 - By: micdot

Because spark plugs are such an important component of an engine, it is imperative that all drivers keep them in top condition. There are various dangers associated with a faulty or damaged spark plug. As a result, it’s critical that you know what’s causing the problems and how to fix them. So, the question is:

Spark plug wires deterioration is caused by what? Many causes, including the spark plugs themselves, can harm the spark plug wires. Oil leakage, overheating, carbon buildup, and an incorrect spacing on the spark plugs are the four most common culprits. Maintaining spark plug wires necessitates addressing and resolving each issue. Spark plugs and their wires are critical components of any gasoline-powered vehicle. When starting an engine, these components are essential. Without them, there is no ignition. Because of this, you must be aware of the causes of harm and do your best to prevent and address them. The four most common ways that spark plug wires and spark plugs themselves become damaged are discussed in detail in this article. In this way, you can learn how to avoid them and deal with the problem if it arises. Let’s get started right away!

Reasons Why Spark Plug Wires Go Bad

Spark plug wires can fail for any of the following causes. In general, these are the four most common causes of spark plug failure. The performance of your spark plug and the wires connecting to it can be affected by each one, so please have a look at them.


If the spark plug tip is continually overheated, it is possible that the plug will shatter. Both pre-ignition and malfunctioning cooling systems can lead to overheating. When pre-ignition occurs, excessive heat builds up in the combustion chamber, causing spark plugs to break.

Motor and spark plugs overheat if the ventilation system is not working properly. Spark plug electrodes and wires might wear out more quickly if they are overheated.

Oil lead from the combustion chamber

Spark plug problems are frequently caused by oil leaking into the combustion chamber. A dirty and filthy spark plug tip could cause it to break prematurely if oil gets into the combustion chamber. You may have a faulty spark plug if your automobile begins to spit out oil, which is a common problem in older vehicles. The spark plugs in these vehicles, then, have a reduced lifespan.

Improper Spark Plug Gap

To get the best performance out of your engine, you must properly set the distance between the center and side electrodes of the spark plug. Having the necessary spacing ensures that the arcing occurs at the proper voltage to burn the gasoline and start the engine.

Consider what would happen if the gap weren’t properly adjusted. There is a possibility that additional stress will weaken the spark plug tip, resulting in an early burnout.

Carbon Buildup

Black, crusted soot coats the wires and insulation tip of a spark plug that has been contaminated with carbon. Carburetor failures, reduced speed, and the presence of the check engine light are all symptoms of carbon buildup on a spark plug. Carbon-fouled spark plugs can be caused by a clogged air filter, prolonged low-speed driving, too much fuel/air mixture, dirty fuel nozzles, or idling your vehicle for too long.

How Do I Know If My Spark Plug Wires Are Bad?

Signs and effects can tell you whether your spark plug wires are in need of repair or replacement. As a result, here are some things to keep an eye out for when determining whether or not your spark plug wires need to be serviced.

Symptoms of bad spark plug wires

The following are three key signs that your car’s spark plug wires are faulty or failing:

Damage due to excessive vibration

The electrical system at the spark plug can degrade over time if the engine is subjected to excessive vibration. A higher voltage is required to start the spark plug. As a result, the ignition coil and spark plug wires could be damaged.

Damage due to excessive heat

Wire insulation and boots may be damaged by the engine’s heat. In addition, a damaged boot could interfere with the proper positioning and operation of spark plug wires. For example, a broken wire wrapping could lead to the grounding of the spark plug, instead of allowing electricity to pass through it.

Damage due to excessive abrasives

The coating on spark plug wires shreds and breaks when they come into contact with engine components that have razor-sharp edges. When this happens, the spark plug may not be approached but rather electricity may fall to the base.

Effects of bad spark plug wires

If you have faulty or broken spark plug wires, you may suffer from their negative impacts. In other words, if you see any of the following symptoms, you may have a faulty spark plug wire:
Acceleration and performance issues
Slower mpg (miles per gallon) and less efficient fuel use
A lot of idle and stuttering
Misfiring and dying of the engine
Engines that are difficult to start
Generally speaking, if you notice any of these symptoms, don’t hesitate to get in touch with your mechanic. They’ll be able to tell you if the problem stems from a bad spark plug.


In a nutshell, spark plug wires deteriorate with time owing to a variety of circumstances. The four most common causes are oil leakage, overheating, carbon buildup, and an improper spark plug gap. As a result, it is necessary to address and fix each of the spark plug wires.

There are a lot of similarities between spark plug wire damage and the damage to spark plugs themselves, as can be shown. As a result, you can argue that keeping the spark plugs involves also maintaining the wires that are related to them. It’s imperative that these components are repaired at the end. If you don’t fix it fast, you could end up with a far more expensive problem down the road.