- Excessive oil consumption: Blow-by can cause the engine to consume excessive oil as it seeps into the combustion chambers and is burned with the fuel.
- Piston ring damage: Blow-by can often be a result of worn or damaged piston rings, which fail to seal the combustion chamber properly and allow gases to escape.
- Blue or white smoke: Blow-by can cause a blue or white smoke to be emitted from the exhaust pipe. The blue smoke indicates the presence of oil, while the white smoke indicates water entering the combustion chamber through leaky head gasket.
- Rough idle and knocking sounds: Blow-by can lead to a rough idle and knocking sounds in the engine. This is due to the loss of compression caused by the leaking gases.
- Exhaust back pressure: Excessive blow-by can increase the exhaust back pressure, leading to a loss of power and performance.
- Increased emissions: Blow-by can result in increased hydrocarbon (HC) and carbon monoxide (CO) emissions from the exhaust as unburned gases escape the combustion chambers.
