With normal spark plug wear, the base of the insulator turns slightly yellow or brown, indicating that nothing is wrong with the engine. When wear goes beyond normal, the center electrode erodes and the distance between the electrodes becomes large. Corroded electrodes, black soot (which indicates a dirty air filter), oily dirt on the electrodes, lead residue or impurities, a fused electrode and a cracked insulator are all indications that the spark plugs should be replaced, often due to problems in other parts of the engine.

When inspected, the spark plugs usually indicate symptoms of other problems that may be occurring with the engine, such as: a dirty air filter, a faulty choke or one that has been working for too long, the use of poor-quality fuel, lead residue in the fuel, the use of corrosive additives in the fuel or lubricating oil, among others. In these situations, replace the set of spark plugs in your engine with new Wega spark plugs, checking the correct application described on our website or in the app.

When it comes to spark plugs, never reuse damaged plugs and always use appropriate tools for removal or installation, as tightening may vary according to the model of each engine. Always consult a trusted mechanic or a specialist from your preferred store.