Diesel produces more smoke than gasoline when it burns. So, it is normal for all diesel cars to generate some emissions. Are you facing the problem of smoke from exhaust on startup? All fumes aren’t the same and some of them may be giving us clues about possible mechanical problems, here you will see why.
Does your car make smoke from exhaust on startup
Surely, you’ve ever seen how the car in front expels strange colored smoke. Have you stopped to look if your car also happens? A lot of eyes, because it is a symptom that something can go wrong. We could even make a kind of saying: Does your car smoke from exhaust on startup? Tell me the color and you will know the fault.
It is clear that the smoke is known where the fire is depending on the type of smoke that comes from the exhaust of our car. We can find out what is happening inside the engine and take appropriate steps to avoid major problems.
White smoke from car exhaust
Is it hard for your car to start? Once it starts, it emits a lot of white smoke from car exhaust and it is quite thick (it takes a while to disperse)? As soon as the engine heats up, stop throwing it? Normally, it is due to a bad set-up of the diesel injection system. That white smoke is actually diesel vapor: if the injection pump is out of point and injects the fuel too early or too late. Instead of burning by the compression in the cylinder, only a part is burned. The rest evaporates. If your vehicle does not have an injection pump because it is a common rail or injector pump. What happens is that the combustion chamber is very cold? You probably have a preheater in poor condition.
White smoke from car exhaust in cold and hot
A little white smoke from car exhaust and not very thick (it disperses quickly) is normal when starting the engine, especially in winter. When burning a hydrocarbon – gas oil or gasoline- water vapor is generated. When the propeller is turned off, the cold outside condenses the steam and causes water to remain in the exhaust pipe. When we start the mechanics and the temperature rises. We evaporate the water from the exhaust again and comes out white smoke from car exhaust. This is not usually much. If it persists, we will usually have a cooling problem. The part of the antifreeze enters the cylinder and mixes with the fuel.
This smoke from exhaust on startup has a very peculiar smell and is usually accompanied by temperature failures. Most likely, the head gasket is bad and has to be replaced. It is not a cheap repair; about 6 hours of labor plus the planned stock, etc. Price range between $800 and $1,500. However, if we take a long time to solve it or if we are not careful and “pass” the temperature, we can deform the stock so much that it cannot be planned and we need a new one. It is usually around $3500.
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Blue smoke from car exhaust
If the blue smoke from car exhaust on startup is slightly blue and smells a bit of toasting from the exhaust, what happens is that oil is entering the combustion chamber.
There are four possible reasons for this to happen to white smoke from car exhaust on startup:
- That the cylinder head gasket is in poor condition and oil from the distribution to cylinder number 1. In this case, the smoke usually appears always.
- That the turbo is worn out and the oil that lubricates its axle leaks in the intake circuit. The smoke will come out especially when smoke from exhaust when accelerating hard and when we are stopped at idle.
- That the valve guide seals are worn: The smoke exits through the exhaust when we release the accelerator and the car retains. It is because the vacuum is generated in the cylinders and absorb the oil that oozes from the valves.
- That the engine is worn (normally, the piston segments): In this case, the smoke usually comes out always, but more when smoke from exhaust when accelerating. What happens is that there is no hermetic seal between the piston and the cylinder wall and the lubrication oil goes into the combustion chamber.
Black smoke from exhaust when accelerating
The black exhaust smoke is due to a bad combustion of diesel, usually due to an excess of fuel (or lack of oxygen) or a bad spray of the injectors. It usually occurs when smoke from exhaust when accelerating thoroughly. If you do it just a moment when you “stop”, it is more or less normal. But if we continue to black exhaust smoke as if we were a squid fleeing from its hunter. We have a fault. Most often it is due to a problem with the recirculating exhaust valve (famous EGR) to the accelerator should be closed to come into the cylinder only clean air and oxygen-rich. In order to burn well the excess fuel, we inject smoke from exhaust when accelerating. If it is not closed, the fuel will continue to mix with the recirculated exhaust gas.
By having less oxygen, the diesel does not burn completely and that’s cause of smoke from exhaust on startup. It may also be that we have an air intake in the intake manifold or the flowmeter in poor condition. A dirty air filter can also cause this problem by not allowing the intake air to enter correctly. If all that is perfect, the fault is in an injector that does not spray the fuel well. If the drops that are injected into the cylinder are too large, they do not mix with oxygen optimally and do not burn well.
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