how to remove a broken spark plug

How to Remove a Broken Spark Plug


Sometimes, when you attempt to remove an old spark plug from your vehicle, it can break, causing frustration and potential damage. However, with the right tools and technique, you can safely remove a broken spark plug without causing further harm to your engine.

Step 1: Safety First

Before you begin, ensure that your engine is completely cooled to avoid any accidental burns.

Step 2: Gather the Tools

Here’s what you’ll need:

  • Socket wrench with a spark plug socket
  • Needle-nose pliers
  • Penetrating oil or a rust-breaker spray
  • A strong vacuum cleaner or compressed air
  • Thread chaser or tap and die set (optional)

Step 3: Prepare the Area

Remove any debris, dirt, or oil around the spark plug to prevent anything from falling into the engine during removal.

Step 4: Apply Penetrating Oil

Spray a rust-breaker or penetrating oil around the broken spark plug. Let it sit for a few minutes to loosen any corrosion or rust that may be causing it to stick.

Step 5: Grip and Remove the Broken Spark Plug

Using the needle-nose pliers, carefully grip the exposed part of the broken spark plug, gripping as close to the base as possible. Slowly and gently rotate it counterclockwise to loosen it from the threads.

Step 6: Clean the Area

After removing the broken spark plug, clean the area with a vacuum cleaner or compressed air to remove any debris or fragments.

Step 7: Inspect the Thread

Examine the spark plug hole’s thread for any damage or cross-threading. If necessary, use a thread chaser or tap and die set to repair the threads before installing a new spark plug.

Step 8: Install a New Spark Plug

Gently insert a new spark plug, making sure to hand-tighten it correctly. Avoid using excessive force, as it may damage the threads.

Step 9: Final Checking

Once the new spark plug is installed, double-check all connections, and make sure everything is tightly secured.


Removing a broken spark plug from your vehicle requires patience, the right tools, and careful execution. By following these steps, you can safely remove a broken spark plug and get your engine running smoothly again. However, if you’re unsure or uncomfortable with the process, it’s always best to consult a professional mechanic.

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