How To Stop Spark Plug Wires From Arcing? (Explained)

Many people have experienced the condition of spark plug wires arcing in their automobiles on multiple occasions, and as a result, they start looking for solutions to prevent spark plug wire arcing. So, how to stop spark plug wires from arcing?

When it comes to car maintenance, spark plug wires are a necessary evil. They can be difficult because they are long and thin. Additionally, they become charged electrically, occasionally acting as a lightning rod when the wires are too close. The wires may occasionally spark so badly that they catch fire from the electric charge.

Any of these circumstances can cause the metals in your spark plug wires to spark when they come into touch with each other. This leads to exposing your car’s engine to failure or other issues that might be too expensive to fix.

The finest method for preventing spark plug wire arcing is crucial to understanding since it will keep the engine of your car running smoothly and efficiently. The engine of your car cannot function properly without spark plugs and the wires that connect them.

How to Know If Your Spark Plugs Are Arcing?

Your spark plugs will undoubtedly exhibit certain indications if they are arcing. You might observe an engine misfire, for instance. Unexpected increases in fuel usage are projected. You’ll idle in an odd way. The radio occasionally makes a high-pitched screech.

Below, we’ll list a few symptoms.

Increased Fuel Consumption

A spike in your car’s fuel usage is one of the most common indicators of a damaged spark plug. An engine’s moving parts can become contaminated by a spark plug that is so defective that it develops gaps and transfers debris to the area of combustion.

Rough Idle of Engine

Rough idle is yet another typical spark plug arcing symptom. The wires in your spark plugs assist in transferring electrical currents from your vehicle’s electrical system to the spark plugs in its engine during ignition.

Your spark plug wires may hinder the steady flow of electric current that should reach the spark plugs if they are arcing. A rough engine idle may be the result of such restriction.

Engine Noise

A severe instance of engine knocking can result from an arcing spark plug. When an engine knocks, further components could be damaged. These components include the perforable piston head and the molten cylinder head valves.

The piston compression rings and the cylinder, which can get perforated due to continual pressure in the combustion chamber, are other components that could be damaged. Other components could stop working if the lubricating system becomes clogged with debris.

Misfiring Engine

Partial fuel combustion causes engine misfiring. This symptom is always indicated by a flashing check engine light and might result in problems such as power loss. In addition, there are erratic engine noises, carbon deposits near the spark plug, and engine knock.

Reduction In Acceleration Power

Your car may lose acceleration power as a result of an arcing spark plug. The vehicle’s high fuel consumption is one of the effects of this condition. Fuel usage is higher than usual.

Reasons For Arcing of Plug Wires

We aided you in recognizing these symptoms in the section above. The causes will then be discussed. What then triggers spark plug arcing? Let’s go over the primary causes of arcing so that you can more easily manage and avoid the problem.

Inadequate Ground Connection

There is a link between the spark wires and the ignition coil. Only when the ground connection is stable will the created voltage be able to pass through the plug wires to the coil.

However, if there is a faulty connection, the power cannot return and sparks may appear to be coming from the spark plug wires.

Damaged Wires

There are a number of flaws that plug wires could have, such as a poor ground connection, subpar insulation, and an excessive amount of contaminants. All of them have the potential to damage the plug wires and, under some circumstances, lead to arcing.

Faulty Electrical Connection

Arcing may occur on the plug wires if the wires receive an unsteady electric supply from the battery. Since the electrical flow is not simultaneous in the case of an unstable connection, spark plug arcing is frequently seen outside.

Unreliable Ignition Coil

A poor or unstable ignition coil cannot withstand the high voltage that travels through the plug wires. Because jumping off the plug gap requires enduring the voltage.

The plug wires arc when an ignition coil fails to sustain voltage because the coil offers low voltage through a convenient and alternate path.

How To Stop Spark Plug Wires From Arcing?

If your spark plug wires are arcing, you already know it because you have witnessed the signs of spark plug arcing. Now that it has started, we need to know how to stop it, and the methods for doing so are mentioned below.

Routine Inspection

One essential step in preventing spark plug wire arcing is to perform a routine inspection of the vehicle’s engine and wires. By regularly checking the spark plugs, you can ensure that your automobile is running smoothly.

Additionally, you need to regularly inspect your spark plug wires for wear-outs and be sure to remedy any issues as soon as you see them. Your spark plug wires could arc if you neglect to perform this regular maintenance check on the engine of your car.


Spark plug wires arcing can be brought on by a number of causes, one of which is a broken shift linkage. Electrical current that does not flow uniformly is the reason for the disconnect.

So the solution to stop the wires from arcing is to locate this point of disconnect and rectify it. The wires shouldn’t arc at ground planes like the engine bracket, exhaust manifold, or intake gasket, for example. This will also assist.

To check for loose wire connections in electric arcs, use an arc-fault detection instrument. You should carefully replace any faulty connections after identifying them by replacing any relevant parts or cables.

Alternate The Arcing Ignition Coils

The purpose of ignition coils is to deliver high voltage sparks to the spark plugs. The combustion gases in the engine cylinder ignite due to the high voltage sparks. However, a weak coil may result in spark plug arcing.

Due to the high voltage’s inability to spin and escape to grounds or sources outside of the coil ignition’s support surfaces, arcing occurs. Therefore, stopping spark plug wire arcing requires replacing the weak ignition coils and the spark plug wires that are attached to them.

Replacement of All Spark Plug Wires with New Wires

Typically, sparking from spark plug wires and worn-out wires will cause plug wires to arc. This may occur as a result of wires that aren’t working properly and are causing arcing between the engine’s ground block and the cables.

The best course of action in this situation is to replace all of the damaged spark plug wires with new ones, which is simple given that the wires are reasonably priced. The wire arcing will stop once all the damaged wires have been swapped out for new ones, and your car will run at its best.

Put Electric Grease On

Applying dielectric grease will stop spark plug wire arcing, particularly if a poor connection is the root of the spark. The spark plug’s wires that link to the distributor cap must be unplugged in order to accomplish this.

Replace the spark plug wires after applying the dielectric grease to the terminals, and then wait around 60 minutes for the grease to properly seal. By doing this, the engines will run smoothly and wire shorts from the distributor cap will be prevented.

Frequently Asked Questions

Q: What causes plugs to arc?

When electrical connections are sloppy, a phenomena known as arcing can happen. This might occur at wire connections, circuit breaker connections, wall switches, receptacles, or even inside an appliance. Voltage and an actual space both contribute to arcing. The amount of physical space that an arc may cover increases with voltage.

Q: What happens if you keep using a burnt coil?

You can immediately start choking or throwing up, depending on how badly the coil is burned. Depending on the coil type you’re using, they may produce some particles that adhere to the vapor and get inhaled by the user when they’re burned out completely. Some people are allergic to these particles.

Q:What is the difference between arcing and sparking?

Spark is a light-emitting electric discharge that occurs between two electrodes for a relatively brief period of time. An arc is a persistent electrical discharge between two electrodes that emits light that can be seen.

Final Thoughts

Last but not least, doing things the way other people do works best if you have children and take care to keep them safe. Arcing spark plug wires can be a serious safety risk since they can start a fire if they happen while you’re driving. How to stop spark plug wires from arcing is described in this post. To keep your car in good working order and to ensure safe driving, you must know this information.

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