How To Replace Worn Toyota Spark Plugs

If you've noticed a decrease in engine performance, rough idling, or poor fuel economy, it could be time to replace your Toyota's spark plugs. Spark plugs play an essential role in igniting the air/fuel mixture inside your engine, and when they become worn or damaged, it can negatively impact your car’s performance. In this article, we’ll guide you through the process of replacing worn spark plugs in your Toyota, so you can keep your engine running smoothly. If you're not confident doing it yourself, you can always visit Empire Toyota of Green Brook for professional service.

Signs Your Toyota Spark Plugs Are Worn

Before diving into the replacement process, it's important to know when to replace your spark plugs. Some common signs of worn spark plugs include:

1. Rough Idling: If your Toyota is shaking or idling roughly when stopped at a red light, it may be a sign that the spark plugs are misfiring.
2. Poor Acceleration: A noticeable lag when accelerating or a decrease in power while driving could point to worn spark plugs.
3. Poor Fuel Economy: If your gas mileage has dropped unexpectedly, faulty spark plugs might be the culprit.
4. Engine Misfires: A misfire occurs when one or more cylinders fail to ignite properly. This can cause jerking or hesitation during acceleration.
5. Check Engine Light: In some cases, the check engine light will illuminate if there’s an issue with the spark plugs.

If you’ve noticed any of these issues, it’s a good idea to check and possibly replace your spark plugs.

How To Replace Worn Toyota Spark Plugs

1. Gather the Necessary Tools

To replace the spark plugs, you’ll need:

• A ratchet wrench
• Spark plug socket (typically 5/8” or 13/16”)
• Torque wrench
• Extension bar
• New spark plugs (specific to your Toyota model)
• Anti-seize lubricant (optional but recommended)
• Compressed air (optional)

2. Locate the Spark Plugs

Open the hood of your Toyota and locate the spark plugs. The spark plugs are typically found under the ignition coils or spark plug wires, depending on your model. Make sure the engine is cool before working to avoid burns or injury.

3. Remove the Old Spark Plugs

Before removing the spark plugs, disconnect the battery to avoid electrical shocks. Then, remove the spark plug wire or ignition coil from the spark plug. You can use a ratchet wrench with the spark plug socket to carefully unscrew the spark plug. Be sure not to apply excessive force, as this can damage the threads in the cylinder head.

4. Install the New Spark Plugs

Take your new spark plugs and, if you like, apply a small amount of anti-seize lubricant to the threads (this will help with future removal). Using your torque wrench, tighten the spark plugs to the manufacturer’s recommended torque specification. Be cautious not to overtighten, as it can damage the spark plug or cylinder head.

5. Reattach the Ignition Coils/Wires

Once the new spark plugs are installed, reattach the ignition coils or spark plug wires, ensuring they are securely connected.

6. Test the Engine

Start your Toyota to ensure the new spark plugs are functioning correctly. If you no longer experience rough idling, misfires, or other related symptoms, the replacement was successful.

If you're unsure about performing this task yourself, or if you’d prefer professional help, Empire Toyota of Green Brook has a team of experts who can handle your spark plug replacement and ensure your Toyota is running at its best.