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How to Remove Spark Plugs That Are Stuck? Authentic & Reliable Ways


Spark plugs that are jammed can only be unplugged. But how to remove spark plugs that are stuck?

The old spark plugs must be removed first. Then gap the spark plugs to test whether they’re recoverable. To continue, switch out the spark plug.

A good firing order requires that each spark plug wire be routed from the ignition source to the correct spark plug. As a result, only unplug one plug at a time and avoid cutting the wire in half. As long as there is just one wire missing, you won’t get any difficulty.

Spark plug removal is the subject of this article. You should be able to remove the stuck plugs from the cylinder head by the conclusion of this article without harming the cylinder head.

You’ll need these to Get Started

  • The oil that a needle can penetrate.
  • Never-seez.
  • 3-eighths of an inch
  • It’s an 8-inch break bar.
  • Extendable from 2 to 6 inches.
  • Pipe, 2 inches in diameter.
  • A socket wrench for removing spark plugs.
  • Turpentine.

How to Remove Stuck Spark Plugs

If you want to know how to remove a spark plug that is stuck, you’ll need the tools described above. Remove a stuck sparker with these instructions.

Step One: Locate The Plugs:

The first step is to find the plugs. The front spark plugs are typically more accessible than the rear ones. You may be able to access the rear plugs from beneath the car depending on the make and model of the vehicle.

In some circumstances, it may be necessary to remove specific components from other models before they may be accessed directly. For example, removing the electrical connector at the top is required to have access to the glow plugs on a 7.3 Powerstroke.

Remove the wiper tray for other car types to make it simpler to access the sparkers. On most automobiles, removing the tray is a simple task.

Step Two: Apply Penetrating Oil:

PB blaster or any other penetrating oil might be sprayed first. WD-40 isn’t truly oil but rather general-purpose grease as a rust penetrator.

As a result, WD-40 will not do what it was intended to. Leave the penetrating lubricant on overnight after spraying. Although if you only have 30 minutes to spare, it’s okay to participate in this activity.

Step Three: Tighten The Plugs:

The idea of tightening the plugs may sound odd, but it’s the correct procedure. To tighten the spark plugs, use a socket wrench. To aid the penetration of the penetrating oil into the threads, do this.

Step Four: Repeat:

Make sure you use penetrating oil after tightening the spark plug socket with the socket wrench. To remove the spark plugs, repeat this procedure until they fall out. The engine should be running for a few minutes before removing the plugs if you’re experiencing difficulties.

In order to remove blocked spark plugs from an aluminum head, simply starting the engine will do the trick. Because metal expands when heated, this is the explanation. This will give the penetrating oil a little more area to work.

Before attempting again, could you wait for it to cool off? In this case, an extension socket wrench at least six inches long can be used instead. Starting an engine after dismantling the vehicle’s rear sparker may not be a wise idea.

You’ll have to rest your hands on the hot exhaust manifold while working beneath the car. Preventing burns on your arms by removing the engine while it is still cold bits of help.

Step Five: Clean The Plugs:

Spray the threads and the seat to eliminate any remnants of the penetrating oil that may be left behind.

Installing New Plugs: Step 6:

New ones must be installed once the old ones are removed. In addition, use compressed air to remove rust from the ports before installing the new ones. For 5.7 Hemi engines, use these spark plugs, and for 5.4 Triton engines, use these spark plugs.

Tips on How to be Safe

Using the engine to assist in the removal procedure is not recommended; avoid touching the hot exhaust manifold until it has cooled.

Penetrating oils are combustible, and you may need to put out a fire if you’re applying them in an area where temperatures can reach a high level.

removing spark plug from engine

Reasons for Spark Plugs That Get Stuck or Seized

Spark plugs can get caught for a variety of reasons. Carbon accumulation in the combustion chamber is to blame for the first problem. 

As a result, threads might get clogged and are difficult to remove. If the plugs were not properly tightened during installation, carbon would build upon the threads.

Corrosion can develop up in the threads of the spark plugs if they are left alone for a lengthy period of time. These days, frequent maintenance is recommended by the majority of automakers.

Tips for Preventing Spark Plugs from Getting Stuck

It is suggested that you replace them with fresh ones after removing them. Corrosion brought on by time may have caused the plugs to become trapped.

Be sure to properly tighten the new spark plugs to avoid any issues in the future. This will not happen if you tighten the plugs.

Regular maintenance is another option. Inspecting the spark plugs on a regular basis will reveal any issues with them. Corrosion and the accumulation of various sorts of debris in the threads of the spark plugs should be prevented as a result.

Do you know the purpose of the spark plug?

An engine’s fuel/air combination is ignited with the help of spark plugs. Because they only perform one function, they must be constantly maintained. 

Vehicles with internal combustion engines use spark plugs—specifically, engines of four, six, or eight cylinders.

A vacuum-operated fuel pump delivers gasoline to our automobiles’ engines after it has been put into the tanks. Using spark plugs, your fuel mixture is ignited inside the cylinder, resulting in a power to move your car. 

Improved performance and reduced gas consumption can be achieved by increasing the efficiency of this process.

Myths and Facts about Spark Plug Removers

Myth 1: 

Unscrewing the spark plug is made more accessible by applying steel wool before removing it.

It is known that spark plugs with steel wool on top will not come out. Using steel wool to attach to a spark plug makes it impossible to remove them from the engine.

Myth 2:

To remove a spark plug, all you need is a rubber mallet.

Myth 3:

You cannot use chemicals to dissolve the aluminum spark plugs in your skull.

Chemicals do nothing more than assist in loosening the spark plug. Spark plugs caught in aluminum heads will not be removed using this method.


This guide makes it appear that replacing a blocked spark plug is simple. However, this may rapidly turn into a tiresome endeavor. If you speed through it, this is even more likely to happen. Ideally, the penetrating oil should be left overnight.

It’s rare for someone to remove a seized spark plug on their first try successfully. Consequently, it may take several attempts before they loosen up sufficiently to be removed. The method needs time, so be prepared to put in some effort.

The final result should be that with patience and the proper equipment, you should be successful in removing your seized spark plugs.

car engine spark plug replacement


What happens if a spark plug gets trapped in the propeller?

Spark plugs being lodged in the cylinder head can be caused by a variety of factors, including:

  • Spark plug or cylinder head debris.
  • Spark plugs can seize or emit blue exhaust smoke if oil or dirt builds upon their ceramic insulation.
  • Stumped spark plugs need to be replaced because the threads have been stripped.

Is it possible to remove spark plugs with a magnet?

Spark plugs will not come out with a magnet. It’s not going to work. The magnetic nature of spark plug wire boots gives rise to this urban legend.

Can you remove the spark plug with pliers?

Yes, you may use pliers to remove spark plugs if necessary. You can, however, harm the spark plug by using this procedure.

How can I change my own spark plugs?

Yes, in a nutshell. But if you’re not sure what you’re doing, we suggest you call in a professional technician to assist you. Aside from helping to keep things in good shape, it may also save a lot of time and effort.

What size sockets are spark plugs?

Generally speaking, the most common spark plug sizes are 13/16/18 inches in length. In addition, it changes based on the vehicle in question. Before you begin, double-check your engine’s specifications to ensure you’re using the proper spark plug sockets.

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