What is the reason for the black smoke from the car?

Reasons for black smoke from cars (a) general reasons 1, air filter clogging; 2, injector faults, such as poor atomization, dripping or injection pressure is too high; 3, fuel system pressure is too high, such as return pipe clogging, fuel supply is too large, or the regulator is faulty; 4, air leakage; 5, the vacuum is lowered; 6, the ignition system energy is too low, such as spark plugs jumping fire weakly, thus causing the buildup of carbon, affecting the quality of combustion; 7, valve sealing is not tight, internal leakage; 8, improper adjustment; 9, the cylinder barrel and piston clearance is too accurate; 10, the ignition timing is out of alignment, which can cause carbon accumulation, affecting Combustion quality; 7, the valve seal is not tight, internal leakage; 8, improper adjustment; 9, cylinder cylinder and piston clearance is too large; 10, ignition timing is out of alignment, will make the mixture combustion is incomplete; or a few cylinders of the engine does not work, there will also be a small amount of black smoke discharged; 11, combining the gas is too thick, that is, too much mixture in the cylinder air coefficient is too small, the combustion is incomplete, and some of the fuel is decomposed at high temperatures into free carbon from the exhaust pipe, and the formation of black smoke. Discharge, and the formation of black smoke. (B) electronic control reasons 1, oxygen sensor failure, such as power supply line disconnection, can not be heated, oxygen sensor poisoning itself or dirty; 2, air flow meter failure, such as metering error or out of adjustment; 3, cold start injector failure; 4, fuel pressure regulator failure, such as oil pressure regulator vacuum hose damage or clogging, will cause the regulator is not sometimes controlled by the vacuum, thus resulting in fuel pressure Excessive; 5, throttle position sensor and its circuit is faulty; 6, intake pressure sensor is faulty, for example, can not provide a normal intake pressure signal; 7, coolant temperature sensor is faulty, for example, can not correctly provide the temperature of the coolant; 8, ECU computer program failure; 9, assembly errors, such as connecting the intake pressure sensor's vacuum hose to the intake manifold (should be connected to the throttle body). . Automobile smoke solution 1, the corresponding parts of the repair and replacement, air filters, injectors, valve seals, cylinder cylinder and piston with, oxygen sensors, etc. 2, cleaning the corresponding accessories to avoid clogging occurs, air filters, injectors is often cleaned accessories. 3, driving habits are also very important, if often slamming on the gas pedal, automobile smoke this type of problem will be aggravated and often occur. 4, often to a series of series of vacuum tubes (should be connected to the throttle body), and the car will not be able to use a series of vacuum tubes. 4, often on a series of accessories to check the system oil pressure, air filter, oil supply system, air intake system, air intake system and intake pressure sensor, line, spark plugs and ignition lines, oxygen sensors, flow meters and related lines, fuel injector related lines, pressure regulator and related lines. 5, fuel oil should not be used arbitrarily, the importance of choosing the quality of the same brand of oil. Fuel model selection is also quite important, do not arbitrarily not the same model selection.