Many drivers pay attention to the exhaust pipe only when blue or black smoke begins to come out of it, and large soot deposits have appeared. But you can’t bring it to this, if you make it a rule to regularly look into the pipe and check if deposits have appeared in it. It is known that soot is formed for a reason, and it can be used to judge the condition of the engine and the problems that have appeared.
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Causes of soot formation
If there are no malfunctions in the engine, then a minimum amount of carbon deposits will form in the exhaust pipe. But if strong deposits appear, this is a reason to be wary.
As a rule, the formation of a thick layer is accompanied by other bad signs: muffler shots and / or intense smoke. Difficult starting of the engine and too high fuel consumption are also possible. Such symptoms most often indicate the ingress of engine oil or unburned fuel into the exhaust system or their simultaneous penetration.
Nagar due to bad fuel
The most common cause of soot formation is poor-quality fuel. The fact is that low-grade fuel cannot provide the required level of detonation. Sensors mistakenly perceive this as a need to enrich the mixture and give a command for additional fuel supply. It burns incorrectly, resulting in an increase in the concentration of carbon, which at high temperatures is converted to soot. If you continue to refuel with low-quality fuel, then very soon this will lead to coking of the engine.
In addition, the formation of large deposits of soot in the exhaust pipe can contribute to the malfunction of the nozzles or the carburetor, caused by their severe contamination. In this case, the shape of the spray pattern changes, due to which the air-fuel mixture burns not in the cylinder, but in the exhaust manifold.
If you notice that the soot in the pipe has grown too quickly, and the muffler makes uncharacteristic sounds, this indicates a failure in the power system. And, most likely, they were provoked by low-quality fuel. In this case, a cleaning additive will help correct the situation. The use of such a tool will save you from spending on diagnostics and replacing candles.
Another explanation for the formation of soot is an air filter clogged with dirt, which allows too little oxygen into the combustion chamber. As a result, the system incorrectly calculates the load on the engine and creates an incorrect air-fuel mixture. As a result, it does not burn out completely, part of it is thrown into the exhaust pipe, settles on its walls and forms soot.
Carbon deposits due to oil
Lubricant can enter the exhaust pipe for various reasons. But most often this is facilitated by worn piston rings or their occurrence. As a result, the substance is deposited on the walls of the cylinder, then enters the combustion chamber, and then into the exhaust system, where it is converted into soot and soot.
Another reason for oil ingress is engine coking. In this case, you will need to use drugs to clean it.
In addition, the penetration of grease into the muffler may occur due to worn valve seals. Therefore, they allow oil to pass through, which then goes to the exhaust valves. You can cope with a similar problem by replacing the oil seals and regularly cleaning the oil system.
Other causes of heavy carbon deposits in the exhaust pipe
In addition to the listed factors for the appearance of deposits in the pipe, there are others:
- incorrect setting of cold engine speeds;
- breakdown of the fuel pump;
- incorrectly adjusted ignition timing, due to which the combustible mixture is too enriched;
- violation of sparking;
- incorrectly set gaps between the breaker contacts.
- The appearance of strong soot is also due to malfunctions in the motor itself. Most often it is provoked by:
- deterioration of the cylinder-piston group;
- incorrect valve clearances;
- gas distribution failure.