A blown head gasket can allow coolant to enter the combustion chamber, where it will vaporise and exit the exhaust as white smoke. This is usually accompanied by other symptoms, such as low coolant levels, overheating, and a rough idle.
2. Intake manifold leak:
A leak in the intake manifold can also cause white or grey smoke, especially when the engine is hot. This is because the vacuum created by the engine can draw coolant or oil into the manifold, where it will burn and produce smoke.
3. Cracked cylinder head:
A cracked cylinder head can also allow coolant to enter the combustion chamber, causing white smoke. This is a serious condition that can lead to engine failure.
4. Worn piston rings:
Worn piston rings can allow oil to enter the combustion chamber, where it will burn and produce blue or grey smoke. This is usually accompanied by low oil levels and a loss of engine power.
5. Turbocharger failure:
A failed turbocharger can also cause white or grey smoke, especially when the engine is under boost. This is because the oil that lubricates the turbocharger can leak into the exhaust system and burn.
