In the life of every motorist, a moment comes when his car does not want to start. It happens that he still gives some signs of life, but often he just keeps silent and rotates with a starter, leading to a dead state and the battery. Then a series of events should be held.
To ignite a mixture in a combustion chamber, two things are required: the mixture itself and the spark that will ignite it. First of all, in such cases, you should make sure that you have the first one. If everything is normal with her, then you need to unscrew the candles and make sure that there is a second one.
In addition, you need to make sure the electrodes are clean and find out whether there is carbon deposits on candles. The color of the spark plugs in such situations may indicate the origin of the malfunction. Of course, you need a certain skill to determine the shade, but it all comes down to the practice and inspection of candles in various situations.
For example, black soot on candles, which are cleaned only with coarse-grained emery paper, indicates that oil gets into the cylinders, which means it's time to think about replacing it, along with piston rings and oil seals. Typically, this symptom is accompanied by increased engine smoke, as well as a sharp drop in power. The first manifests itself most of all during start-up and starting, since at such moments the most combustible mixture enters the cylinders.
Black soot on spark plugs, which is erased with a finger or rags, is a consequence of over-enrichment of the mixture, it's just soot. It is logical to assume that in addition to this, the driver should notice an increase in fuel consumption. If the car owner himself does not notice, then he should be indicated on this at the next inspection, since the concentration of harmful emissions increases significantly. Also a hint may be black smoke from the exhaust pipe, which is quite rare. In general, the color of the exhaust gases and the color of the spark plugs are directly related, since the former are deposited on the latter, and experienced car enthusiasts and car service masters use this.
In addition, soot on candles can be white or shade of gray. This color indicates that there is not enough gasoline in the combustible mixture, it is depleted. To eliminate this problem, it is worth adjusting the carburetor a little, or check the serviceability of the control unit. Like all other symptoms, this one is not left alone, as they say "there is no smoke without fire", only here it is the other way around. Besides the fact that there is soot on candles, there are also puffs of smoke of the same color, which are especially manifested during heavy loads on the engine. Starting is also difficult, it occurs only after 20-30 seconds of rotation of the crankshaft by the starter. The thing is that there is not enough gasoline in the mixture to ignite.
So what should be the candles? Redheads. This answer can be confusing for many car owners, but it is. Color should be sand. An important condition is the cleanliness of the electrodes. It is worth paying attention to the above symptoms with each replacement of spark plugs, this will help extend the life of the engine.