Whatever a person does, experience comes over the years, and with it the skill. This also applies to trade operations with used cars. So, for example, many outbidders who have filled their hand can easily determine the general condition of the power unit, simply by looking at the exhaust pipe of the car. Anyone can do this if they know exactly which nuances to pay attention to.
Many problems of the power unit of a car can be identified without serious diagnostics, which is carried out using special tools and equipment. Of course, an assessment by eye will not give the motorist an accurate and undeniable conclusion, but it will allow with a certain degree of probability to determine the presence of a complex of certain problems and malfunctions with motor. This is exactly how outbids are done already at the first acquaintance with the client's car. In order for "everything to become clear", most often it is enough just to start the engine and look at the exhaust pipe.
1. Blue smoke
If dense blue smoke is pouring out of the car, then there are definitely problems with its engine. This indicates the presence of problems with ventilation of crankcase gases or severe wear of the valve stem seals. In advanced cases, the problem may lie in the wear of the cylinder walls. In any case, the presence of gray smoke is already a reason for deep car diagnostics.
2. White smoke
Is acrid white smoke coming out of the tailpipe? If so, things are clearly bad. This behavior most likely indicates that the machine has serious problems with antifreeze. Most often, white smoke appears when the latter enters the engine's combustion chamber. Sooner or later, this will lead to engine breakdown and serious repairs.
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3. Soot
Another important point that most agents pay attention to is the presence of soot in the exhaust pipe. If it accumulates in a representative amount, it means that the power unit of the car has problems with fuel consumption. Most likely, the engine absorbs more of it than it needs and burns it incorrectly. And this is already a reason for a serious, full-scale diagnosis.
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4. Black condensate
Last but not least, what car buying and selling agents pay attention to is the presence of condensation in the muffler. If there is something like wet carbon deposits on the car's muffler, then things are bad. Most likely it is black condensation. When it flows out of the exhaust pipe when the engine is started, nothing terrible happens. There are problems with the engine if black condensation accumulates at the outlet of the muffler even when the car is idle. Most likely, such a car has serious problems with oil consumption.
If you want to know even more interesting things, then you should read about what triangles are knocked out on the side of the tires.
A source: https://novate.ru/blogs/080720/55216/