What Causes a Spark Plug to Blow Out? (Causes and Easy Fixes)

what causes a spark plug to blow out

So let us find out what causes a spark plug to blow out and how to fix it to prevent harm to your engine.

It blows apart whenever the spark plug is fitted too firmly or not securely sufficient to the engine plug. Consequently, the spark plug physically malfunctions and can no longer effectively transfer electrical energy from the tip to the cylinder block.

This is an extremely risky situation since it can occur while you’re riding and result in a wide range of engine issues. Thankfully, spark plug repair is reasonably simple and affordable. Nevertheless, if your ignition blows out, you could have to pay extra costs that drive up the overall cost and length of the restoration project. 

Spark Plug Blow Out Symptoms

This is another instance where you really don’t need to worry about performing any diagnosis, despite the fact that some instructions include a tonne of indications of a blown spark plug.

This is due to your vehicle’s noise when a spark plug explodes within the engine block.

Creaking or thumping noises from the engine may indicate that the spark plugs must be changed.

Everyone nearby the car at the time may realize since it is loud and very obvious. In addition, if the vehicle would even start to operate, it would sound terrible. And it only applies to one damaged spark plug.

It’s rather simple to identify the issue because the spark plug is hanging by a cable when you open the bonnet.

Also, the majority of modern vehicles feature an initial advantage that alerts you to any engine problems. For instance, if the engine indicator light flashes or glows, the engine may be having problems.

As soon as you notice the signals alerting you, you must move quickly to get the problem fixed before it’s too late and the vehicle sustains irreparable harm. We suggest that you keep a lookout for lights like this one since they may signal spark plug issues.

What Happens with a Blown Spark Plug?

A Misfiring Powerplant

A vehicle’s power may easily be seen increasing and decreasing. You should get your car checked if this is the situation. Usually, misfires are caused by insufficient spark plugs in the space.

A malfunctioned motor will damage the catalyst converter and spray fuel over the exterior. Intense smells might serve as indicators of possible harm.

Excessive Gas Usage

The engine begins to destress itself in an attempt to continue running whenever a spark plug burns out. You’ll notice that your automobile is using more gasoline than before as a result of the gasoline consumption rate being impacted.

A worn-out spark plug directly hampers the engine block, and the resulting reaction increases fuel economy. The cylinder ceases operating effectively, forcing you to replace the gasoline earlier than necessary. If you’ve experienced this, your automobile needs maintenance.

Unnatural Acceleration

You may easily identify spark plug blowout issues by pressing the accelerator pedal. Spark plugs that have broken are clearly visible if the vehicle’s velocity is not increasing and it stutters.

Failure of the spark plug can slow down the carburetor’s responsiveness and prevent it from accelerating as quickly as it once did. If you have this issue, you ought to be aware that the plug is insufficiently powerful to spark the air-fuel mixture effectively.

What Causes a Spark Plug to Blow Out?

According to legend, spark plug failures were less common in the past since cylinder heads were typically made of cast iron, and their threading was extremely hard to remove. The cylinders in contemporary automobiles are increasingly frequently composed of aluminum alloys.

The cylinder head threads often peel when spark plugs that have been built and manufactured to be more durable are used, and they may even blow out the upper plug casing or its ceramic core.

Here are some main causes of sparkplug blow out:

Cross-threaded Plug

Cross-threaded plugs are one of the important factors in spark blowouts. It may happen as you place a spark plug and, rather than taking it out and straightening it, you continue to twist it with a wrench after it starts to stick out of the slot. Cross threading causes the thread breakage that might make the plug not fastened. Once this occurs, a spark plug burst may occur because of the intensity of the ignition.

Installing the plug with only your finger effort will ensure a clean placement and prevent spark plug cross-threading. You may utilize an attachment on a spark plug spanner if you can’t access the connection with your finger.

Fractured Threads

A spark plug that has been put on broken holes may also cause a blowout. Worn threads won’t hold the plug firmly if the ignition force pushes out the plug.

Unstable Spark Plugs

Spark plug blowouts may also be caused by plugs that are too sloppy or that aren’t tightly fastened. It tends to slide across the holes if it is free. Whenever this occurs, the threads may eventually become fatigued and come free. 

Produced with a Defect

It is quite uncommon to receive a defective plug because companies that make automotive components evaluate their goods before shipping them. Despite this, spark plug producers may still deliver subpar material.

How to Fix Spark Plug Blow Out?

You can take things into your hands and repair them yourself or send your vehicle to a car service center.

If you are going to do it yourself, specialized repair kits include everything you require for this issue.

With the help of the equipment, you may retighten the spark plug hole that has been blown out and, afterward, attaches a sleeve to accommodate the replacement spark plug.

Simply replacing the spark plug runs the danger of it popping out once more. Use the proper torque specification for the sleeve to prevent the issue from recurring.

Or else you may send the vehicle to a trusted workshop and do the work properly.

How Far Can you Drive With a Blown Out Spark Plug?

In summary, a vehicle may continue operating with a fallen spark plug, but doing so is risky. You may run as far as you need if the problem is with one spark plug. We encourage you to get the unit fixed as soon as you notice any issues so as not to put the vehicles under undue strain when driving.

How Much Does It Cost to Fix a Blown Out Spark Plug?

A vehicle with a burst spark plug may normally cost around $800 and $1,000 to repair. However, based on the vehicle, you should prepare to pay around $250 and $600 if you decide to do the operation at home and purchase the replacement part you’ll need to do the task. The cost of the necessary instrument determines the cost in this instance. 

You May Also Like


Please enter your comment!
Please enter your name here