Why my car throws black smoke

The smoke expelled by the exhaust pipe of the car can say much of any fault that is present and when we are in the presence of black smoke, it is very common for people to become disconcerted thinking that it is something very serious and that it can seriously damage the useful life of the automobile.

For the most part, this characteristic in the smoke, when described black, is due to a bad combustion, that is to say that at least 90% of the causes are derived from the fact that there is a problem in the combustion of gasoline. If it has happened to you and you ask yourself, "Why does my car use black smoke ?", We bring you the possible causes and solutions to these situations.

Your car emits black smoke by bad spray

Why does black smoke come out of the exhaust? Well, there may be many reasons but to begin with, it may be due to failures in the injectors or directly in the injection pump. In the case of injectors may be due to obstructions, breaks or dirt inside them; These causes cause a bad combustion, starting from here the expulsion of black smoke.

Depending on the state of obstruction that the piece presents, a cleaning solution of injectors can be used, which will help a lot against leaks. In the event that they are broken or that the dirt is extremely crystallized or hardened, the piece must be replaced.

In this other article we tell you How to clean the car injectors.

On the other hand, poor spraying of the injection pump, may be due to poor regulation in that part, which generates an excess of pressure causing the injectors to spray in an uncontrolled manner, causing an excess of carbides. The solution is to repair or replace the injection pump with a new one.

Bad gasoline pressure

On many occasions, the circuit responsible for the distribution of gasoline to the engine can be damaged; this failure can generate changes in the fuel pressure causing the fuel pump to expel too much and with an excess of force the fuel to the engine. In addition, to make black smoke out of the exhaust of your car, this problem causes your car to consume more gas than necessary, so for one reason or another should be repaired as soon as possible.

This failure is necessary to verify it in the workshop with a specialist mechanic, in the same way to make any repair in the circuit or properly in the pump.

It is a sign that the air filter is dirty

It can vary depending on the car and the characteristics it presents, but in the case of older vehicles that have a carburetor, the excessive black smoke coming from the exhaust pipe will be noticeable and, in contrast, in the case of new cars that have an exhaust system. injection, more than smoke, will begin to have problems to accelerate.

When the air filters are clogged or clogged by excess dirt, the amount of air that enters the cylinders to burn is extremely small, resulting in heavy combustion and, therefore, black smoke.

The most appropriate solution is to change the air filter or send it to be cleaned by a specialist.

Faulty EGR valve

Another reason that answers your question about "why does my car smoke black?" It is a problem in the EGR valve. This valve called EGR valve, as its acronym in English indicate and can be translated as Exhaust Gas Recirculation, is responsible for reducing the emission of CO2 produced by the car. This is achieved thanks to the recirculation of the gases to the combustion chamber, causing that through the intake manifold, they burn again and generate much less CO2 than would normally be the case.

The process is carried out by opening and closing said valve, when it is oversaturated with carbon, it begins to present problems to open and when this happens, no clean oxygen passes, only air already contaminated with the same char, causing the fuel to not burn in its entirety and that the exhaust pipe eject black smoke .

To solve this problem, you must remove the EGR valve and clean it thoroughly, in the same way check if it has any breakage and if so, replace it.

Problems with the flowmeter

The function of this device is to measure the amount of air that the engine sucks in order to control both the need for gasoline and the amount of gas emitted by the car's engine . The flowmeter is a sensor that is responsible for telling the injectors when to spray and the appropriate amount of fuel. When the piece has some breakage or has faults in its structure, it begins to make erroneous measurements of air, making it oversaturated with fuel.

To solve it, remove the flowmeter and clean the sensor . If it presents excessive damage, change it to a new one to avoid black smoke.