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When starting the engine on your Renault megane there is smoke coming from exhaust?

It's common for a Renault Megane (or any car) to emit a small amount of smoke upon starting, especially when cold. This is often just water vapor, which is harmless and a normal part of the combustion process.

However, if you're seeing significant or unusual smoke, it could be a sign of a problem. Here's a breakdown of what the smoke color might indicate:

* White smoke: This is usually water vapor, particularly on cold mornings. However, if it's thick, persistent, or accompanied by a sweet smell, it could indicate a coolant leak into the combustion chamber, a serious issue.

* Blue smoke: This indicates burning oil, usually due to worn piston rings, valve stem seals, or a leaking turbocharger.

* Black smoke: This often means a rich fuel mixture, which could be due to a faulty fuel injector, air intake leak, clogged air filter, or a problem with the engine control unit (ECU).

Here's what you should do:

1. Don't panic! A small amount of smoke is usually normal.

2. Observe the color and quantity of the smoke: This can give you clues about the possible cause.

3. Check your engine oil level: If it's low, it could indicate burning oil.

4. Check your coolant level: If it's low, it could indicate a leak into the engine.

5. If the smoke is excessive or persistent, consult a mechanic: They can diagnose the problem and recommend repairs.

Important: Never ignore smoke coming from your exhaust, especially if it's accompanied by other symptoms like a loss of power, strange noises, or unusual smells. Early detection and repair can prevent more serious damage to your engine.