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Author Diagnose the cause of exhaust smoke
Sam
Moderator
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Registered: 24th Dec 99
Location: West Midlands
User status: Offline
21st Oct 11 at 21:52   View User's Profile U2U Member Reply With Quote

Blue Smoke = OIL

This is caused by oil entering the combustion chamber, burning along with air and fuel. Leaking cylinder head gaskets are common causes of this type of smoke.

Black Or Grey Smoke = FUEL

This is a result of an excessively rich mixture of air and fuel entering into the cylinders. The proportion of fuel is more in the air to fuel ratio. This fuel rich mixture does not burn completely in the combustion chamber and produces black smoke coming out of your exhaust tailpipe, thus affecting engine performance and fuel economy. Although a rich mixture is necessary for engine start up, black smoke is an indication of a faulty fuel injection system or ECU sensor(s).

White Smoke = WATER/COOLANT

The white smoke coming from your exhaust tailpipe is actually steam, which indicates that water or coolant is being burned along with the fuel and air mixture in the engine. You may also judge the problem, if you have to add water and coolant more frequently than normal and you don't have a visible coolant leak. Water or coolant if mixed with the engine oil entering into the engine's cylinders can seriously damage your engine. Leaking cylinder head gaskets and cracked/warped/porous cylinder heads are common causes of this type of smoke. This diagnosis can be confirmed by checking your oil and header tank (coolant) caps for a white mayonnaise-like substance on the inside of the caps.

[Edited on 29-02-2012 by Ian]

 
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