Meaning of the smoke colors coming out of the exhaust
Smoke coming out of any part of your vehicle can be cause for concern. If you are noticing it coming out of the exhaust, you can tell what the problem is by the color of the smoke.
Blue
If you notice blue or grey-colored smoke coming out of your exhaust, this could be due to a blocked PCV valve that sucks oil into the engine. If your engine continues to consume oil, this can create internal damage to the piston rings, valve seals or other components inside the engine.
Black
Having a rich fuel ratio can create black smoke coming from your exhaust. If your engine is burning more fuel without enough air intake, it could be caused by leaking fuel injectors, a bad fuel pressure regulator or a blockage in the air intake.
White
If the air is a little cooler and you notice the white smoke is wispier, there should not be too much cause for concern. As your engine warms up, the condensation in your exhaust is just turning into vapor. If you are noticing white smoke on an otherwise warm day or this continues to happen, then it could be due to coolant being consumed by your engine. This could happen from a leaking head gasket and should be fixed because a major break happens.
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