The color of the exhaust from a vehicle
can give us an idea about what's happening inside the engine. Vehicle owners
should pay special attention if the exhaust is colored. It indicates any
possible default in your engine such as unburned fuel, burning of engine oil,
damaged valve and piston parts, etc.
Blue/ Gray smoke:
Blue smoke is a clear indication of
burning of engine oil or other lubricants during combustion. The valve seats
when damaged can allow few amount of lubricant oil to leak through it and that
oil mixes with the air-fuel charge and later when it is burned, produces blue
colored smoke. It may also occur in cases where the piston rings are worn out
and engine oil seeps through it from crankcase. The engine oil burns with the
fuel and produces blue smoke. One should regularly check the engine oil levels.
If the parts are worn out, it should be replaced with new ones to avoid ant
further issues. Excess oil levels can also cause this problem, hence oil level
should be maintained properly.
White smoke:
White smoke is a result of the coolant
being burned during combustion. Cracked cylinder head, blown head gasket
and cracked cylinder blocks can help the coolant to seep through and burn
during combustion. White smoke can also be caused by condensation when the
engine is too cold or when water gets vaporized during combustion.
Black smoke:
Burning too much fuel can result in
black smoke. Less amount of air can lead to incomplete fuel combustion. Clogged
air filter, carburetor malfunction, fuel injector malfunction, improper
ignition timing are some of the causes for incomplete fuel combustion
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