What does your vehicle's smoke color means?

The color of vehicle exhaust can tell us a lot about  vehicles. You can even predict the problem in you vehicle by looking at smoke color. Generally the smoke emitted by the vehicles is colourless.  But in case of problem the smoke colours may vary. The  commonly observed colours are black, white or blue etc. The smoke colour may change due to burning of other materials i.e. lubricant, water, coolant etc along with petrol Let's see what does a particular exhaust color means.

Smoke Color: Blue/gray    
                       Vehicle emitting blue smoke, what does the colour of vehicle smoke means

Blue/gray exhaust smoke means there may be an engine oil leak and your engine is burning engine oil. The leak could be caused by several issues like leaking valve seals, damaged piston rings, leaking cylinder head gasket or worn cylinder walls
Smoke Color: Black 

Thick black smoke being emitted by a vehicle

It is the most commonly seen exhaust color. You might notice block smoke at the time you pull your choke, but this is normal. Black exhaust smoke appears when the vehicle burns very fuel rich mixture. The Ideal Air-fuel ratio for Gasoline is 14.7:1. This is also called stoichiometric Air-Fuel ratio. Any mixture containing fuel more than the stoitiometric one is called rich mixture. The reasons for mixture to get rich may be :
1. Blocked air filters,
2. Malfunctioning of fuel injection system and 3.  Blocked intake manifold etc.
All these can choke the air supply to the engine causing the Air-fuel mixture to be rich and produce black smoke on burning. 

 Smoke Color: Thick white/gray 

Thick white smoke being emitted by a vahicle
The white smoke may be caused due to water vapor. It means that some water is present inside and is coming out as vapor. This occurs only at the starting of vehicle and stops after some times. But a steady stream of thick white/gray exhaust smoke coming from your muffler could mean there is a damaged head gasket. In this case the coolant may be leaking and burning inside combustion chamber. A coolant leak in the summer could easily lead to an overheated engine.
Heavy white/gray exhaust smoke  could also mean a cracked block or cylinder head—both very serious problems that should be addressed quickly.


  1. This is really a nice and informative. containing all information and also has a great impact on the new technology. Thanks for sharing it
    Vehicle Banksman

  2. Great article. Thanks for sharing the valuable information. Next time, will be checking the smoke and then investigate the problem through this article itself.

  3. Hey what a brilliant post I have come across and believe me I have been searching out for this similar kind of post for past a week and hardly came across this. Thank you very much and will look for more postings from you.
    Vehicle Banksman


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