If your car feels rough, stalls, or drinks more fuel, dirty spark plugs are often to blame. Cleaning them is cheaper than buying new ones and can give your engine a noticeable boost. Below you’ll find a simple plan to check, clean, and reinstall spark plugs so your ride runs smoother.
Look for these signs before you decide to clean:
If you notice two or more of these, pull the plugs and give them a good clean.
You only need a few basic items:
All of these are easy to find at any auto parts shop or online store.
1. Disconnect the battery. This prevents accidental sparks while you work.
2. Remove the spark plug wires or coil packs. Pull the boot straight off – never twist it.
3. Unscrew the plug. Use the socket and turn counter‑clockwise. Keep the plug upright to avoid spilling oil or coolant.
4. Inspect the plug. If the electrode is cracked or the insulator is broken, replace it instead of cleaning.
5. Brush off carbon. A brass wire brush removes most buildup. Lightly scrub the tip and the metal body. Avoid using a steel brush; it can damage the plug.
6. Blow out debris. Use compressed air to clear any remaining dust. Hold the plug upside down so debris falls out, not back in.
7. Check the gap. Use a feeler gauge to make sure the gap matches the vehicle’s spec (usually 0.6‑0.8 mm for most cars). Adjust if needed.
8. Apply dielectric grease. A tiny dab on the boot end helps prevent moisture and future fouling.
9. Reinstall. Screw the plug back in by hand, then tighten with the socket – about a ¼ turn past finger‑tight is enough.
10. Reconnect wires or coils. Push the boot back on until you hear a click.
11. Reconnect the battery and test. Start the engine. It should run smoother and idle steadier.
Regular oil changes and using the right fuel type reduce carbon buildup. If you drive short trips often, consider a fuel additive that helps clean the combustion chamber.
Also, check your air filter. A clogged filter forces the engine to work harder, which can foul plugs faster.
Finally, note the service interval in your owner’s manual. Most manufacturers recommend replacing plugs every 30 000‑50 000 km, but a good clean can extend that life a bit.
Cleaning spark plugs yourself saves money and gives you a better feel for your car’s health. Keep these steps handy, and you’ll notice a smoother ride and better fuel numbers in no time.
