![]() ![]() This would also need replacement.īurned plugs: Burned spark plugs are plugs with melted electrodes or blisters or white deposits on the electrodes due to running extremely hot. Lead-fouled plugs: In lead-fouled plugs, the nose of the insulator is covered in yellow deposits. While replacing spark plugs should handle the situation, find the source of the issue, and tackle it. This can happen due to oil leaking into the cylinders and getting past damaged pistons or valve guides.įouled plugs failing to ignite the fuel properly often cause an unusual vibration when starting the engine. ![]() Oil-fouled plugs: Oil-fouled plugs are plugs whose electrodes or insulator tips are covered with black oily deposits. The engine, however, compensates for lack of power by pushing more fuel into the combustion chamber. The inability to properly burn fuel also leads to insufficient engine power. Some symptoms of black spark plugs may include higher fuel consumption and sluggish acceleration, among other things.īlack or carbon-fouled plugs don’t burn fuel properly, resulting in longer acceleration. A plug can get fouled due to dirty air filters, using rich or lean fuel, idling too long, or driving at a relatively low speed. So, if you’re wondering how to tell if the spark plug is bad in a snowblower or other vehicle, you may find this helpful.Ĭarbon-fouled plugs: Carbon-fouled spark plugs are plugs whose electrodes and insulator tips are covered in dry or black soot. The electrode or insulator tip of a bad spark plug will look burnt, fouled, worn, broken, or covered with oil deposits. Allow them to dry out before reinstalling otherwise, clean them.įor people wanting to know how should bad spark plugs look? Here you go. While this doesn’t mean they are bad, using it this way may impact engine performance. Plugs can get wet due to engine flooding. Sometimes, you may also notice that your spark plugs are wet. A good spark plug should have a brownish or light deposit at the electrode side, i.e., the plug’s firing end. However, if you have used the plugs for a while, here is how to know if they are still in good condition. A new spark plug wouldn’t have any sediment in its body, electrode, or insulator.
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