How to replace spark plugs

Spark plugs are essential for your car's engine to run properly. They ignite the air-fuel mixture in the cylinders, which creates the combustion that powers your car. Over time, spark plugs can wear out and need to be replaced.

If you're experiencing any of the following problems, it may be time to replace your spark plugs:

  • Engine misfiring
  • Decreased fuel economy
  • Rough idle
  • Difficult starting
  • Increased emissions

Replacing spark plugs is a relatively simple task that can be done at home with a few basic tools.

Here's our step-by-step guide:

Tools & materials needed:

  • New spark plugs (make sure to get the correct type for your car)
  • Spark plug socket
  • Ratchet
  • Torque wrench
  • Gasket sealer
  • Glove
  • Torque wrench


  1. Park your car on a level surface and turn off the engine. Let it cool down for at least 30 minutes.
  2. Pop the hood and locate the spark plugs. There is one spark plug for each cylinder in your engine.
  3. Use the spark plug socket and ratchet to remove the old spark plugs. Be careful not to drop them into the engine block.
  4. Apply a thin coat of gasket sealer to the threads of the new spark plugs. This will help to prevent leaks.
  5. Screw the new spark plugs into place by hand. Be careful not to overtighten them.
  6. Use the torque wrench to tighten the spark plugs to the manufacturer's specifications.
  7. Replace the spark plug wires or ignition coils.
  8. Start the engine and test the spark plugs. Listen for any misfiring or rough running.

Additional tips:

If you're having trouble removing the old spark plugs, you can use a penetrating oil to loosen them up. Be careful not to strip the spark plug threads when tightening the new spark plugs. If you're not sure what the manufacturer's torque specifications are, consult your owner's manual.


Posted on Nov 01, 2023 by Panel Beater Directory

Back to Articles