How To Change 2014-2018 Silverado Sierra 5.3 6.0 6.2 Spark Plugs (3rd Gen)

Introduction

This tutorial will guide you through the process of changing the spark plugs in a 2014-2018 Chevy Silverado or GMC Sierra equipped with 5.3L, 6.0L, or 6.2L engines. This maintenance task is essential for improving engine performance and efficiency. The steps outlined here are based on a video demonstration and are applicable to similar GM truck models such as the Tahoe, Suburban, Escalade, and Yukon.

Step 1: Gather Necessary Tools and Parts

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

Tools

• 6" Magnetic Swivel Spark Plug Socket (not suitable for spark plug #8)
• 3.5" Magnetic Swivel Spark Plug Socket (recommended for spark plug #8)
• Standard Magnetic Spark Plug Socket
• Socket Extensions (1" extension recommended for tight spaces)
• Torx Bits
• Milwaukee Cordless Impact or a standard ratchet

Parts

• Spark Plugs (ACDelco 41-114 for 5.3L and 6.2L, ACDelco 41-110 for 6.0L)
• Spark Plug Wires (ACDelco 758EE for 5.3L and 6.2L, ACDelco 748UU for 6.0L)
• Dielectric Grease

Practical Tip

Make sure to check your vehicle’s manual for the specific spark plug specifications and quantities required.

Step 2: Prepare the Engine

• Disconnect the Battery: Always start by disconnecting the negative terminal of the battery to prevent any electrical shorts.
• Remove Engine Cover (if applicable): Use the appropriate Torx bits to remove the engine cover if your model has one.

Step 3: Access the Spark Plugs

• Locate the Spark Plugs: Identify the location of the spark plugs on each side of the engine. They are generally found beneath the ignition coil packs.
• Remove Ignition Coil Packs:
  • Unplug the electrical connectors from the coil packs.
  • Unscrew the bolts holding the coil packs in place.
  • Carefully lift the coil packs out to expose the spark plugs.

Step 4: Remove the Old Spark Plugs

• Use the Spark Plug Socket: Attach the appropriate magnetic swivel spark plug socket to the ratchet.
• Loosen and Remove Each Spark Plug:
  • Turn counterclockwise to loosen each spark plug.
  • Carefully lift the spark plug out of the cylinder head.

Common Pitfall

Avoid applying excessive force when removing old spark plugs, as this could break them inside the cylinder head.

Step 5: Install New Spark Plugs

• Apply Dielectric Grease: Lightly coat the threads of the new spark plugs with dielectric grease to ensure a good seal.
• Insert New Spark Plugs:
  • Hand-tighten each spark plug into the cylinder head to avoid cross-threading.
  • Use the spark plug socket to tighten them according to the manufacturer’s torque specifications.

Step 6: Reinstall Ignition Coil Packs

• Reattach Coil Packs: Place the ignition coil packs back over the new spark plugs.
• Secure and Connect:
  • Reinstall the bolts to secure the coil packs.
  • Plug the electrical connectors back into the coil packs.

Step 7: Reassemble and Test

• Reinstall Engine Cover (if applicable): Secure the engine cover back in place.
• Reconnect the Battery: Reattach the negative terminal of the battery.
• Start the Engine: Turn on the engine and listen for any irregular sounds. Ensure it runs smoothly.

Conclusion

Changing the spark plugs in your 2014-2018 Silverado or Sierra can enhance engine performance and fuel efficiency. By following these steps, you can successfully complete this maintenance task. Remember to regularly check and replace spark plugs as part of your vehicle's service routine for optimal performance. If you encounter any issues, consult a professional mechanic for assistance.