How are the three colors of smoke from the exhaust pipe different? Symptoms of smoke coming from the exhaust pipe of a car whether it is a gasoline or diesel engine. Indicates a malfunction of the combustion system. Which may be classified according to the smoke characteristics into 3 types: white smoke, black smoke and blue smoke. What abnormal symptoms does each type indicate? What abnormal symptoms does the color of smoke from the 3 exhaust pipes indicate? Black Smoke - Black smoke is the most common. which is caused by incomplete combustion which is caused by an improper mixture of IDs May contain a lot of oil or too little air There is also a chance of this happening if the car owner modifies the engine by installing a rail push box to increase the amount of fuel. Or blocking the soot removal device called Exhaust Gas Recirculation or EGR will cause abnormal black smoke. White Smoke - White smoke is usually caused by the engine becoming loose due to being used for a long time. This is a result of engine oil escaping into the combustion chamber. Through piston rings that have been used so hard that they have deteriorated. Which usually has symptoms of engine oil disappearing together. Blue smoke - Blue or bluish-gray smoke. It is smoke that is rarely seen. The cause of the blue smoke is similar to the case of white smoke. But it is at the stage where the engine has seriously deteriorated. Until a large amount of engine oil escapes into the combustion chamber. The best way is to take the car into the garage to find a solution for further repairs. Information from sanook.com