What causes blue smoke to come out of the exhaust?

Blue smoke can often look like grey smoke at first. But if you notice a distinctive bluish tint, it may signal that the engine is burning lots of oil. This could be due to worn engine components like piston rings, valve seals, or PCV (Positive Crankcase Ventilation) valves.

1. What is the most likely cause of blue exhaust smoke?
2. Why does my car smoke blue when I accelerate?
3. Does Blue smoke mean blown head gasket?
4. Will bad injectors cause blue smoke?
5. Can low oil cause blue smoke?
6. Can PCV valve cause blue smoke?
7. Can a bad EGR valve cause blue smoke?
8. How much does it cost to fix blue smoke from exhaust?
9. Can a bad O2 sensor cause blue smoke?
10. How do you diagnose blue smoke from exhaust?
11. Can a bad diesel injector cause blue smoke?
12. Why is my car smoking but not overheating?
13. Can a bad fuel pump cause smoke?

What is the most likely cause of blue exhaust smoke?

Blue/gray exhaust smoke means there's likely an oil leak and your engine is burning oil. ... The leak could be caused by several issues like leaking valve seals, damaged piston rings, or worn cylinder walls.

Why does my car smoke blue when I accelerate?

Blue Smoke From Exhaust When Accelerating

When blue smoke is emitted from a car's exhaust pipe, this usually indicates that a leak in the engine's valve seals is allowing oil to leak into the combustion chamber where it is being burned along with the fuel. This may be due to natural deterioration or a faulty part.

Does Blue smoke mean blown head gasket?

The most common sign of a blown head gasket is exhaust smoke. White smoke indicates that your car is burning coolant that is leaking into the cylinders. A similar problem is indicated by blue exhaust smoke, though this is a sign of oil leaking from the gasket.

Will bad injectors cause blue smoke?

This can be caused by worn/leaking injectors or restrictions in the air intake system. Blue smoke is normally the result of engine oil entering & burning inside the combustion chamber. ... But what we see more often than not are issues related to worn injectors.

Can low oil cause blue smoke?

Oil leaking into the cylinders can cause a rough idle, misfire and fouled spark plugs. In addition, a reduction in power and oil loss can be indicators that the blue exhaust smoke is caused by an internal engine oil leak.

Can PCV valve cause blue smoke?

Stuck PCV Valve

To put it simply, a PCV valve uses the engine vacuum to pull blow-by (combustion gases entering the crankcase) gases out of the crankcase. ... And the vehicle would emit blue smoke from the exhaust upon combustion of this mixture. A bad PCV valve could cause major engine trouble if ignored.

Can a bad EGR valve cause blue smoke?

The exhaust gas recirculation (EGR) valve might be sticking occasionally and ti can give you blue smoke, when it sticks open it allows in spent exhaust gases which interfere with the combustion process but usually gives other symptoms like rough idle and possible EML warnings.

How much does it cost to fix blue smoke from exhaust?

The Cost of Fixing your Blue Smoke Problem

If you aren't that handy with a wrench, the part will probably cost $80 from a shop, then factor in $500 +/- for labor. It's pretty expensive, but cheaper than a totaled car or a new engine!

Can a bad O2 sensor cause blue smoke?

When operating properly, the O2 sensor cannot cause your engine to smoke. ... If your car runs excessively lean for an extended period of time, you could cause serious engine damage, resulting in black, white or blue smoke from the exhaust, but usually you will be alerted to other symptoms first, such as rough running.

How do you diagnose blue smoke from exhaust?

If you are noticing blue smoke from the exhaust, it means your engine is burning oil due to an oil leak. This symptom could be the result of a leaking valve seal or a problem with a piston ring. What is happening is that the engine seals are not effectively sealing the oil from getting into the cylinders.

Can a bad diesel injector cause blue smoke?

Constant blue smoke on a turbocharged diesel is unlikely to be caused by worn valve stem seals. Instead, the problem is more likely to be: ... Diesel fuel contaminating the oil. This may be caused by faulty injector pump and/or lift pump (which allows engine lubricating oil to mix with the diesel).

Why is my car smoking but not overheating?

The most common answer to, “Why is my car smoking but not overheating?” is that there's a type of fluid that's landed on the engine. This can be motor oil, fuel, transmission fluid, coolant, or even condensation. It can cause your engine to smoke because it's burning off that fluid from the engine.

Can a bad fuel pump cause smoke?

injector pump timing is the most common cause of white smoke. White smoke will result from incomplete combustion if the fuel delivery is delayed or the pressure is decreased. ... A worn out timing gear can cause the incorrect timing.