Anytime you see excessive smoke or steam being produced from the exhaust pipe is means there is a problem. The color of the smoke determines what system could be malfunctioning. A small amount of smoke or steam from the exhaust pipe of the car is normal at start up or under power. Typically, once a vehicle starts producing smoke the pattern will continue until the engine is repaired.
The color of the smoke will help determine what to look for when troubleshooting the problem. Now, when we say the "color" in some cases it will be the tint of the smoke from example blue smoke will be a light gray with a blue hue. Black smoke is basically a very dark gray while white smoke or stream is plain white.
Smoke is always caused by a liquid being present inside the combustion chamber that is not normally there such as coolant, excessive fuel or engine oil. Each symptom has its own set of problems and costs to be associated with.
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