How to Clean Spark Plugs?
2 Answers
Methods for cleaning spark plugs: 1. Cleaning with carburetor cleaner: Carburetor cleaner is a specialized cleaning agent for oil and carbon deposits, effectively removing oil, grease, and carbon buildup. Squeeze the carburetor cleaner into a container, soak the spark plugs in it for half an hour, then use a soft brush to scrub the spark plug heads. This will remove the carbon deposits on the spark plugs. However, special care must be taken to avoid contact with eyes and skin when using carburetor cleaner. If accidental contact occurs, rinse immediately with plenty of water. 2. Cleaning with white vinegar: A common method found online is soaking the spark plugs in white vinegar to clean carbon deposits, as white vinegar is readily available in daily life. The method is similar to using carburetor cleaner: soak for half an hour and then brush with a soft brush. While white vinegar can indeed help clean carbon deposits to some extent, it is not recommended. The acidity of white vinegar can corrode the spark plugs, significantly reducing their lifespan.
I often do DIY car maintenance, and spark plug cleaning is something I do frequently. First, make sure the engine has cooled down for at least an hour before working to avoid burns. Carefully unscrew them using a dedicated spark plug socket wrench, and remember their positions to avoid mixing them up. After removal, gently brush off the carbon deposits on the electrodes with a stiff-bristle brush or a small toothbrush—avoid using a steel brush to prevent scratches. If there's heavy carbon buildup, spray some dedicated spark plug cleaner, let it sit for five minutes, then wipe it clean with a cloth. After cleaning, check the electrode gap; around 0.8-1.0 mm is ideal—too large or too small affects ignition. When reinstalling, align them properly and tighten to a torque of about 20-30 N·m—too loose may cause leaks, too tight may damage them. Cleaning may temporarily restore performance, but they age faster—it's best to replace them every 20,000 km for peace of mind and cost savings. Avoid frequent short trips and cold starts to reduce carbon buildup, and check them during routine maintenance.
