What could be the cause?
I know some water out of the exhaust while it"s cold is normal, but in this case, it happens at every start, even with a hot engine, and the soot is considerable. I"ve just seen a Mazda drip a few drops, which is normal, but if you see the video linked there is a lot of water and soot.
You are watching: Black soot coming out of tailpipe
The electronics in the car are not working very well either.
Edit: There is no overheating, No oil in the cooling fluid and no other symptoms.
Video of the actual problem
engine vw exhaust head-gasket smoke
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edited Oct 16 "15 at 12:51
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asked Oct 13 "15 at 14:13
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There is nothing wrong, water is a byproduct of gasoline combustion.
2 C8H18 + 25 O2 → 16 CO2 + 18 H2O
where C8H18 is the gasoline reacting with oxygen (O2) and giving Carbon-dioxide (CO2) and water (H2O) as the byproduct.
So, this simply is:
2 * Gas molecules + 25 * Oxygen Molecules → 16 * Carbon Dioxide Molecules + 18 * Water Molecules
So the black soot is just water mixed with carbon in exhaust pipe.
Water usually comes out when engine is not hot enough like when starting it. So the liquid water drips out of exhaust with the carbon mixed in it making it black. But after driving a little the engine becomes hot and so thus the water and it comes out as steam. So you don"t need to worry.
In some cases the cause of water leaking from exhaust is a blown up head gasket, or cracked head, but that also results in overheating of engine. Since your engine is not overheating so i would say that it"s just water getting accumulated in our silencer and coming out when you start the engine.
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I can"t say much about the electronics, maybe just some wires got loose. You should probably get that checked by someone in the garage.