How To Replace Spark Plugs

Many car owners are intimidated by the idea of replacing spark plugs. It’s actually an easy and straightforward task anyone can do with the right tools. If you replace the spark plugs yourself, you’ll save a lot of money on labor.

If you’re not sure how to replace your spark plugs, this tutorial is for you. We’ll walk you through the process of replacing the spark plugs in your engine.

Finding Replacement Spark Plugs

Spark plugs replace

Before starting the job, you need to get replacement spark plugs. Even if you have only one bad spark plug, it’s still a good idea to replace all your spark plugs at once. It costs more than replacing only one spark plug, but it brings some benefits. For instance:

  • If one of your spark plugs is bad, chances are all the others will go bad soon. Replacing them all at once will save you time.
  • All your spark plugs will have the same levels of electrical resistance. This makes the engine run smoothly.

We always recommend OEM over aftermarket spark plugs for the reasons listed here. We carry OEM spark plugs for many different makes and models at wholesale prices. Here are some of our best sellers:

If you're not sure how many spark plugs to get, look at how many cylinders your engine has. You need one spark plug per cylinder. For example, if you have a V8, you need 8 spark plugs.

Once you have your replacement spark plugs, it’s time to start the replacement process.

Replacing Your Spark Plugs In 11 Steps

Spark plug tools

The spark plug replacement process may vary slightly between makes and models. The general overview of the process, however, remains the same. If you're a car owner who's just starting to work on cars, replacing the spark plugs is the perfect job for beginners. It's a pretty simple job, and you would only need a couple of tools:

  1. Spark plug socket
  2. Ratchet

You may also need a couple of extensions if you have spark plugs that are hard to reach. A ring nose plier may come in useful, too, but it's not necessary.

Without further ado, here's how to replace the spark plugs in your engine:

  1. Make sure that the engine is off and cool to the touch.
  2. Disconnect the negative battery cable from the battery.
  3. Remove the engine cover (if there's one).
  4. With compressed air, blow away the dirt and debris surrounding the ignition coils or spark plug wires.
  5. Find the coil or spark plug wire and then disconnect each one.
    1. Pull it straight up (not at an angle). If this is difficult to do, use a ring nose plier.
  6. Now you can see the spark plug deep down into the well. With the spark plug socket, unscrew the spark plug and then remove it.
  7. Compare the old spark plug to the new spark plug.
    1. Make sure that they're exactly the same size.
  8. Apply anti-seize lubricant to the new spark plug's threads.
  9. Screw the new spark plug into the combustion chamber by hand with the socket and ratchet. Never use an impact gun. Be careful not to overtighten it.
  10. Push the spark plug wire all the way down into the cylinder until it clicks.
  11. Repeat with the rest of the spark plugs in your engine.

Got any questions about replacing your spark plugs? Please contact us!