Why white fumes appear from the silencer when we start an automobile?

Question

Accepted Answer

White fumes from automobile silencer are due to condensation of water vapor and unburnt fuel.

During combustion, water vapor is produced as a byproduct.
When the exhaust gases cool down in the silencer, the water vapor condenses and appears as white fumes.
Unburnt fuel can also contribute to the white fumes.
This is a normal phenomenon and nothing to worry about unless the fumes are excessive or have a strange odor.

Accepted Answer

Coolant leak
White smoke is often a sign that coolant is leaking into the engine's combustion chamber and burning. This can be caused by a cracked or leaking head gasket, or a cracked engine block. If the smoke smells sweet, it could indicate that coolant has mixed with the engine oil. 
 
Condensation
When a car is started in cold weather, the hot exhaust gas meets the cold air outside, causing condensation and steam to form. 
 
Bad fuel injector
White smoke can also be caused by a bad fuel injector, which can happen when there's a lack of fuel in the injector body.

Accepted Answer

When your car sits outside, especially overnight, condensation can build up inside of the exhaust system. Starting your car will warm that condensation, turning it into steam. As the exhaust system warms up, the condensation will disappear, and the white steam along with it.

Accepted Answer

White fumes cause unburn fuel and water Lin combation chamber

Accepted Answer

White fume from the silencer before the engine at rest once the engine run the speedy what flow make congestion since the consisten of oxygen in water emit it self leaving back hydroxile thus forcebly form white fume .

Accepted Answer

Air fuel combustion takes place in Engine

Accepted Answer

The exhaust gases through the atmosphere

Accepted Answer

The exhaust gases through the atmosphere

Accepted Answer

WHILE WE START THE ENGINE, THE CYCLINDER PUMPS FORM BOTTOM TO TOP. SO THAT TIME THE FUEL WILL BURN DUE TO COMPRESSION. SO WHEN THE STROKE APPLIES THE FUME WILL BE EXHAUSTED

Accepted Answer

WHILE WE START THE ENGINE, THE CYCLINDER PUMPS FORM BOTTOM TO TOP. SO THAT TIME THE FUEL WILL BURN DUE TO COMPRESSION. SO WHEN THE STROKE APPLIES THE FUME WILL BE EXHAUSTED

Why white fumes appear from the silencer when we start an automobile?

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