Discover the Secret to Changing Spark Plugs in a Subaru: Step-by-Step Guide

Are you looking to breathe new life into your Subaru? Replacing the spark plugs is a simple yet crucial maintenance task that can significantly improve your engine’s performance, fuel efficiency, and overall health. This comprehensive guide will walk you through the process of how to change spark plugs Subaru, empowering you to tackle this DIY project with confidence.

Why Change Spark Plugs?

Spark plugs are essential components in your Subaru’s combustion system. They ignite the air-fuel mixture, enabling the engine to run smoothly. Over time, spark plugs wear down, leading to:

• Reduced engine performance: Worn-out spark plugs can cause misfires, resulting in a loss of power and acceleration.
• Increased fuel consumption: Inefficient combustion due to faulty spark plugs leads to higher fuel consumption.
• Rough idling: A sputtering or irregular idle is a common symptom of worn-out spark plugs.
• Hard starting: Difficulty starting your Subaru can be a sign of spark plug issues.
• Emissions problems: Worn-out spark plugs can contribute to increased emissions, harming the environment.

Gather Your Tools and Supplies

Before diving into the process, ensure you have the necessary tools and supplies:

• New spark plugs: Consult your Subaru’s owner’s manual for the recommended spark plug type and gap.
• Spark plug socket: A 5/8-inch spark plug socket with a rubber insert to prevent damaging the plug.
• Wrench or breaker bar: Use a wrench or breaker bar that fits the spark plug socket.
• Torque wrench: A torque wrench is essential for tightening the spark plugs to the correct specifications.
• Gloves: Protect your hands from dirt and grime.
• Safety glasses: Protect your eyes from flying debris.
• Shop towels: Clean up any spills or messes.
• Optional: Spark plug gap tool: Use this tool to ensure the spark plug gap is set correctly.

Preparing Your Subaru for Spark Plug Replacement

1. Park your Subaru on a level surface: Ensure the parking brake is engaged and the transmission is in “Park” or “Neutral.”
2. Disconnect the negative battery terminal: This prevents any accidental electrical shocks during the process.
3. Locate the spark plugs: Consult your owner’s manual or online resources for the location of the spark plugs on your specific Subaru model. They are typically located on the top of the engine, under a plastic cover.
4. Remove the spark plug cover: Carefully remove the cover, which is usually held in place by clips or screws.

Removing the Old Spark Plugs

1. Clean the area around the spark plugs: Use a shop towel to remove any dirt, debris, or oil that may hinder access to the spark plugs.
2. Loosen the spark plugs: Using the spark plug socket and wrench or breaker bar, gently loosen the spark plugs by turning them counterclockwise.
3. Remove the spark plugs: Once the spark plugs are loosened, remove them completely. Be careful not to drop them or damage the threads.

Installing the New Spark Plugs

1. Inspect the new spark plugs: Ensure the new spark plugs are the correct type and have the recommended gap.
2. Install the new spark plugs: Carefully thread the new spark plugs into the spark plug holes, making sure they are seated properly.
3. Tighten the spark plugs: Using the torque wrench, tighten the spark plugs to the specified torque value. Overtightening can damage the spark plugs, while undertightening can lead to leaks.
4. Reconnect the battery terminal: Once the spark plugs are tightened, reconnect the negative battery terminal.

Final Touches and Starting Your Subaru

1. Reinstall the spark plug cover: Securely replace the spark plug cover.
2. Start your Subaru: Turn the key and start the engine. Listen for any unusual sounds or noises.
3. Check for leaks: Inspect the spark plug area for any signs of leaks.
4. Dispose of the old spark plugs properly: Do not throw them in the trash. Recycle them at a local auto parts store or recycling center.

Taking Your Subaru for a Test Drive

After completing the spark plug replacement, take your Subaru for a test drive to ensure everything is working properly. Pay attention to:

• Engine performance: Does the engine feel smoother and more responsive?
• Fuel consumption: Has fuel efficiency improved?
• Idling: Is the idle smooth and consistent?
• Starting: Does the engine start easily?

The Power of a Fresh Start: Your Subaru’s New Spark

By following these steps, you’ve successfully replaced your Subaru’s spark plugs, giving it a fresh start and restoring its power and efficiency. Remember to consult your owner’s manual for specific instructions and recommendations based on your Subaru model.

Frequently Asked Questions

Q: How often should I change my spark plugs?

A: The recommended spark plug replacement interval varies depending on your Subaru model and driving habits. Typically, it’s between 30,000 and 100,000 miles. Consult your owner’s manual for specific recommendations.

Q: Can I use any type of spark plug for my Subaru?

A: No, it’s crucial to use the correct type of spark plug for your Subaru model. Refer to your owner’s manual or consult a mechanic for the recommended spark plug type and gap.

Q: Can I replace the spark plugs myself, or should I take it to a mechanic?

A: Replacing spark plugs is a relatively simple DIY project. However, if you’re unsure or uncomfortable with the process, it’s best to take your Subaru to a qualified mechanic.

Q: What are the signs that my spark plugs need to be replaced?

A: Common signs include reduced engine performance, increased fuel consumption, rough idling, hard starting, and misfires.

Q: How long does it take to change spark plugs on a Subaru?

A: The time required to change spark plugs varies depending on the model and access to the spark plugs. However, it typically takes about 30 minutes to an hour.