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White Smoke from ExhaustA little whitish vapor in the first few seconds after start-up is nothing to worry about; it's condensation being blown out of the exhaust system and will quickly disperse. Smoke that persists, however, is cause for concern.

* Black smoke comes from partially burned fuel. This indicates that the air filter or fuel system needs to be serviced.

* Blue smoke indicates burning oil is a bad sign. Clouds of blue smoke on start-up may indicate worn valve-guide seals, valves, or piston rings, the latter of which can mean a cylinder-head or engine rebuild is needed.

* Billowy white smoke may indicate that coolant is getting into the engine. Another bad sign. This can be a result of a blown head gasket, damaged cylinder head, or even a cracked block. All are expensive repairs.

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Q: What is causing white smoke to come out of the exhaust for a few seconds when you first start your car?
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