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Corsa Sport » Message Board » Tutorials & FAQ » Engine Work, Tuning & Exhausts » Diagnose the cause of exhaust smoke » Post Reply

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[quote][i]Originally posted by Sam[/i]
[b]Blue Smoke = OIL[/b]

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.

[b]Black Or Grey Smoke = FUEL[/b]

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).

[b]White Smoke = WATER/COOLANT[/b]

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] [/quote]

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Sam	posted on 21st Oct 11 at 21:52
Sam	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]