The emmission of visible colored smoke indicates that there is a problem with your car engine. It is a negative sign. However, it may be considered as positive as different colors indicate different problems. Blue smoke coming from exhaust pipe indicates that your engine is burning oil in combustion chamber.
A normal car engine have very thin white smoke. There should not be very much smoke at all. You may notice increased visible gases come out in cold weathers. It is due to contact of hot gases from exhaust with outside cold air. Moreover, it should vanish quickly.
Blue Smoke Coming From Exhaust Pipe
Is it okay to continue driving while blue smoke coming from exhaust pipe? No. Immediately visit a garage and get it repaired. Otherwise it may cause more damage and can completely kill your engine.
Blue Smoke Coming From Exhaust Pipe: Why?
The major cause is entry of engine oil into combustion chamber which burn with fuel. However below given factors are responsible to create this crucial issue. You must know these aspects so that you may aware and keep safe your engine.
1. Oil Leaks in Combustion Chamber
Oil leaks in combustion chamber due to various reasons. It may be due to worn engine oil seals, gaskets or cylinder heads. These seals get damaged due to overheating generally. Sometime oil leaks due to defective oil control rings. This leaked oil burn with fuel in combustion chamber and produce blue smoke.
2. Blown Turbocharger
Your turbocahrged car needs proper oil to perform efficiently. Low oil levels, poor quality or incorrect grade of oil build up carbon deposits in the engine and blow out turbocharger. It may become faulty due to inside broken oil seal or damaged turbo casing. In both cases oil seeps into air intake of engine and burn with fuel to produce blue smoke.
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3. Stuck PCV Valve: Blue Smoke Coming From Exhaust Pipe
A stuck PCV valve will continue mixing of air and other gasses in the engine. It may happens due to dirty air filter by which the air-fuel ratio will also be disturbed. The combustion of mixture of gasses and improper air fuel ratio produces blue smoke.
4. Damaged Valve Seals
The valves in engine have two major functions. These are entry of gasoline-air mixture and exhaust of gasses due to burning. The damaged rubber seals allow oil into the combustion chamber and produce blue smoke.
Must Read: Engine Oil Consumption: The Ultimate Guide To Optimize
5. Oil Coating on Spark Plugs
Basically it confirms the above given likely issues. Just pull your spark plugs one by one. The spark plug which has oil coating will give you idea where is the problem. This oil coating is confirmation of engine oil mixing with fuel in combustion chamber and produces blue smoke.
6. Overfilled Engine Oil
Engine oil filled more than its upper level is dangerous for engine. It creates oil pressure by which seals get damaged. Ultimately, broken seals allow engine oil into combustion chamber to burn with fuel and produces blue smoke.
7. One Blue Smoke Puff Every Morning
The blue smoke coming from exhaust pipe once in the morning on startup indicates valve guide seals are worn out. It allows oil past the seals down the valve into the combustion chamber to join fuel.
