Sunday Service: Spark Plugs

Changing Your Own Spark Plugs—A DIY Guide

Spark plugs are small but mighty—they play a crucial role in your engine’s performance, fuel efficiency, and smooth starts. This Sunday Service, we’ll walk you through how to check and change your spark plugs at home, saving you money and keeping your ride running strong.

Spark Plug and Socket Wrench

When Should You Replace Spark Plugs 

Check your owner’s manual—most cars need new plugs every 30,000–100,000 miles.

Signs It’s Time To Get Them Changed: 
  •  Rough idle
  •  Hard starts
  • Sluggish acceleration
  • Poor fuel economy
  • Engine misfire

What You’ll Need To Get Job Done

  • New spark plugs (right type for your vehicle)
  • Spark plug socket and ratchet
  • Socket extension
  • Torque wrench (recommended)
  • Dielectric grease (optional)
  • Anti-seize compound (optional—check manufacturer recommendations)

Step-by-Step Instructions

  • Let the engine cool completely before starting.
  • Locate your spark plugs—usually under ignition coils or plug wires.
  • Remove one plug wire or coil at a time to avoid mix-ups.
  • Use the spark plug socket and ratchet to remove the old plug.
  • Check the old plug for wear, oil, or carbon buildup (a window into your engine’s health).
  • Thread in the new spark plug by hand to avoid cross-threading. Tighten to spec with a torque wrench.
  • Reinstall the wire or coil, moving to the next plug and repeating until all are changed.

    • Pro Tips

    • Only work on a cool engine to avoid burns and stripped threads.
    • Replace plugs one at a time to keep wires in order.
    • Check gap on new plugs if your vehicle requires it (many come pre-gapped).
    • Don’t overtighten—use a torque wrench for best results.

    Not sure what plugs your car needs, or want a pro to handle it? Contact Torque Motorsports for expert service and advice!

    Author: Brandon Hurst-Torque Motorsports

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