Subaru Forester XT 2.0 Spark Plug Replacement (2014 - 2018)

Introduction

This tutorial provides a step-by-step guide for replacing the spark plugs in a 2014 to 2018 Subaru Forester XT with a 2.0 turbo engine. Regular maintenance, such as changing spark plugs every 60,000 miles, is essential for optimal engine performance. This process involves removing the airbox and battery for access, making it slightly more complex than other inline 4-cylinder engines.

Step 1: Gather Required Tools and Materials

Before starting the spark plug replacement, ensure you have the following tools and materials:

• New spark plugs (Turbo models: NGK ILKAR8H6)
• Socket wrench with extension
• Spark plug socket (typically 5/8 inch)
• Screwdriver set
• Pliers
• Torque wrench
• Clean cloths or rags
• Safety goggles and gloves

Step 2: Disconnect the Battery

To ensure safety while working on the engine:

1. Open the hood and locate the battery.
2. Use a socket wrench to disconnect the negative terminal first, followed by the positive terminal.
3. Remove any battery hold-down clamps to take the battery out if needed for better access.

Step 3: Remove the Airbox

The airbox needs to be removed to access the spark plugs:

1. Disconnect the air intake hose by loosening the clamp with a screwdriver.
2. Remove any screws or clips securing the airbox in place.
3. Carefully lift the airbox out of the engine bay, ensuring no components are damaged.

Step 4: Access the Spark Plugs

With the airbox removed, you can now see the spark plug wells:

1. Inspect the area for any debris and clean it with a rag to prevent contamination when replacing the plugs.
2. Identify the spark plug locations.

Step 5: Remove the Old Spark Plugs

Follow these steps to remove the old spark plugs:

1. Use a socket wrench with a spark plug socket to carefully unscrew each spark plug.
2. Turn counterclockwise until the spark plug is free.
3. Gently pull the spark plug out of the well.

Tip: Be cautious to avoid dropping any debris into the cylinder.

Step 6: Install the New Spark Plugs

Now it's time to install the new spark plugs:

1. Take the new spark plug and apply a small amount of anti-seize compound to the threads (optional).
2. Carefully insert the new spark plug into the well.
3. Hand-tighten the plug initially, then use the torque wrench to tighten it to the manufacturer’s specifications (usually around 13-15 lb-ft).

Step 7: Reassemble the Airbox and Battery

Once all spark plugs are replaced, reassemble the components:

1. Reinstall the airbox by reversing the removal steps:
   • Secure any clips or screws.
   • Reattach the air intake hose and tighten the clamp.
2. Place the battery back in its tray and secure it with clamps.
3. Reconnect the positive terminal first, followed by the negative terminal.

Conclusion

Replacing the spark plugs in your Subaru Forester XT is a straightforward process that can significantly enhance engine performance. Regular maintenance such as this should be part of your vehicle care routine. After completing the replacement, consider checking other engine components, such as air filters and fluids, to ensure your vehicle runs smoothly. If you have any questions or run into issues, consult your vehicle’s service manual or a professional mechanic.