How to Remove a Spark Plug That is Stuck

How to Remove a Spark Plug That is Stuck?

The engine’s combustion system is composed of a variety of components, each of which is essential to the operation of the automobile. The spark plug is among the essential parts. Your car may experience significant issues when a spark plug is broken or stuck. So How to remove a spark plug that is stuck?

Any automobile requires regular spark plug replacement as part of normal repairs. Sometimes, a spark plug will get trapped or seize up when you attempt to take it out. A blocked spark plug could be difficult and time-consuming to remove. But if you put in a little work and have a large amount of patience, you can do it.

What Exactly Is A Spark Plug?

The spark plug is among the most vital elements of a vehicle’s power source. It is in charge of igniting the gasoline and air combination in the cylinders by producing sparks.

A metallic shell, a central electrode, and a ground electrode make up a conventional spark plug. The metallic shell has threads that allow it to be fitted onto the motor’s cylinder head. The ground conductor is attached to the engine compartment, while the center conductor is linked to the ignition coil.

The center conductor receives voltage when the combustion is turned on. This power causes a spark to fly throughout the space between the ground conductor and the center conductor. The gasoline combination in the pistons is ignited by the spark, which causes the vehicle to start.

Based on the vehicle and riding style used, a spark plug’s lifespan might change. Spark plugs may typically be changed after 20000 kilometers. Spark plugs with iridium or platinum tips are now widely available from manufacturers and have an 80,000-kilometer lifespan.

What Causes A Spark Plug To Stick?

There are a variety of causes for a spark plug to become jammed, such as rust, starting to fail, and clogging. Spark plug choking is a prevalent issue. Whenever particles accumulate on the spark plug’s conductors, clogging takes place.

The engine may operate badly due to these contaminants lowering the spark plug’s functionality. Some other frequent issue with spark plugs is misfiring. The motor may run harshly or halt if the spark plug fails to produce a spark, which causes malfunctioning.

Spark plug oxidation is another prevalent issue. The spark plug conductors can rust and create corrosion, which can make the machine run badly or even not at all.

What Causes Spark Plugs to Get Stuck?

Various factors might cause plugs to stick to the engine.

  1. Oil 
  2. Corrosion
  3. Faulty Ignition Coil
  4. Rust


The plug could become oil-coated and challenging to replace if it is placed in a position where there has been a lot of grease buildup, such as close to the valve cover.


The plug conductors can corrode and induce corrosion, which might result in the engine idling badly or never at all.

Faulty Ignition Coil

A defective ignition coil may create severe electricity to accumulate on the plug, causing it to ignite the engine.


Rust can build up mostly on the screw’s threading and making it hard to detach.

How to Remove a Spark Plug that is Stuck?

Removing a fouled or blocked spark plug might be challenging, particularly if the plug is attached to the cylinder. So let’s see how to remove a spark plug that is stuck or jammed.

Identify the precise location of the spark plug of your motor. Spark plugs are frequently located in difficult-to-reach areas of automobiles, such as the side or bottom of the engine. You may have to employ a lift in such circumstances to get to them.

Remove the spark plug by pulling the cover from the plug cable.

Apply penetration oil down the spark plug’s bore to form a solid coating around the plug. The penetration lubricant should aid in removing any blockage and corrosion leading the spark plugs to block.

Wait anywhere between ten and thirty minutes. By doing so, the lubricant will have more time to go below the accumulation surrounding the spark plug. Waiting longer is preferable. The majority of mechanics advise letting penetration oil on overnight.

Before trying to remove the spark plug, twist it to tighten it gently. Rotate the plug in the right direction with a wrench. After that, remove it by rotating it backward. The accumulation around the plug’s threading may be loosened by slightly compressing the plug.

If the plug is still jammed, dip it in oil once again.

Start the car’s engine, and let it heat up. The lubricant will be able to penetrate farther into the plug’s threading thanks to the heat’s assistance in loosening the buildup surrounding the plug. Let the vehicle cool, and wrench the plugs again. 

How Can I Prevent Trapped Spark Plugs?

Ensure your plugs are the exact fit and kind for your vehicle beforehand. Seizures might result from plugging incorrectly.

Also, ensure the spacing between plug electrodes is adjusted appropriately by checking it. Ignition issues might result from a distance that is either too large or too small.

Utilize the right grade of gasoline, and maintain your engine in good working order. Utilizing fuel that is contaminated or of low quality might result in particles that can block the plugs.

Could a Faulty Spark Plug Harm My Engine?

An unreliable spark plug occasionally causes engine harm. The motor may choke or operate roughly as a result of misfiring. The engine may become harmed if this occurs frequently enough.

The motor may sustain harm as a result of rusting. The plug conductors can corrode and create rust, which might make the car run badly or not work at all.


A trapped or burnt spark plug might be challenging to remove. There are a number of techniques that may be utilized, though, to attempt to get the obstacle out of the way. Using propane oil to loosen hard and jammed plugs is simple. An excellent tool for releasing fused plugs is a heat gun.

The plugs might need to be changed if they are severely rusted. Although cleaning plugs is a reasonably simple chore, it is crucial to do it correctly to make sure the plugs are functioning properly.

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