Toyota Corolla How to replace spark plugs. 2014 -2019

Introduction

This tutorial provides a step-by-step guide on how to replace the spark plugs in a 2014-2019 Toyota Corolla with a 1.8-liter 4-cylinder engine. Regular maintenance of spark plugs is essential for optimal engine performance and can help prevent issues such as misfiring or reduced fuel efficiency. It is recommended to replace the spark plugs every 70,000 to 75,000 miles.

Step 1: Gather Necessary Tools and Parts

Before starting the replacement, ensure you have the following tools and parts:

Tools Required

• 3/8" ratchet (preferably with a flex head for flexibility)
• 3/8" extension wobble set
• 14mm socket (3/8")
• 14mm spark plug socket with a magnetic base
• 10mm socket (3/8")
• 3/8" torque wrench
• Pocket screwdriver (flathead recommended)

Parts Needed

• Spark Plugs Part #90919-01275

Make sure to wear personal protective equipment (PPE) such as gloves and safety glasses throughout the process.

Step 2: Prepare the Vehicle

1. Park the Vehicle: Make sure the car is parked on a flat surface and the engine is turned off.
2. Open the Hood: Secure the hood with the prop rod.
3. Disconnect the Battery: To prevent any electrical shorts, disconnect the negative terminal of the battery.

Step 3: Remove Engine Cover

1. Locate Fasteners: Use the 10mm socket to remove any screws or bolts securing the engine cover.
2. Lift Off the Cover: Carefully lift the engine cover off and set it aside.

Step 4: Access Spark Plugs

1. Identify Spark Plug Wires: Locate the spark plug wires or ignition coils.
2. Remove Wires/Coils: If your model has ignition coils, unclip and remove each coil using the pocket screwdriver if necessary.

Step 5: Remove Old Spark Plugs

1. Use the Spark Plug Socket: Attach the 14mm spark plug socket to the ratchet and fit it over the first spark plug.
2. Loosen the Spark Plug: Turn the ratchet counterclockwise to loosen and remove the spark plug.
3. Repeat for Remaining Plugs: Follow the same process for all four spark plugs.

Step 6: Install New Spark Plugs

1. Prepare New Spark Plugs: Check the gap on the new spark plugs to ensure they meet specifications. Adjust if necessary.
2. Insert New Spark Plugs: Carefully thread each new spark plug into the cylinder head by hand to avoid cross-threading.
3. Tighten with Torque Wrench: Use the torque wrench to tighten each spark plug to the manufacturer’s specified torque (usually around 13-16 lb-ft).

Step 7: Reattach Wires/Coils

1. Reconnect Ignition Coils: If applicable, reconnect each ignition coil or spark plug wire securely.
2. Ensure Proper Connection: Listen for an audible click to confirm they are properly seated.

Step 8: Replace Engine Cover and Reconnect Battery

1. Reattach the Engine Cover: Secure the engine cover back in place using the screws or bolts removed earlier.
2. Reconnect the Battery: Reattach the negative terminal of the battery.

Conclusion

Replacing the spark plugs in your Toyota Corolla can enhance engine performance and efficiency. Regular maintenance, like this, helps avoid costly repairs in the future. After completing this task, consider checking other engine components or scheduling a comprehensive vehicle inspection. Always consult your vehicle's manual for specific recommendations related to your model. Happy driving!