The most common cause of blue exhaust smoke is oil leaking past engine seals and into the cylinders where it then mixes and burns with the fuel. … Oil leaking into the cylinders can cause a rough idle, misfire and fouled spark plugs.
Can bad spark plugs cause smoke?
Spark plugs will not cause the motor to smoke, good or bad. Whitish gray smoke sounds like a fueling problem.
How do you fix blue smoke from exhaust?
How To Fix Blue Smoke From Exhaust
- Clean The Engine. Have you checked the engine yet? …
- Fix Valve Seals. Replacing Valve seals is not too hard and can be done at home by someone who can work on engines comfortably. …
- Fix Bad Glow Plug. …
- Fix PCV Valve. …
- Fix Blown Turbo. …
- Fix Transmission Modulator.
What does Blue smoke from the tailpipe usually indicate?
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.
Is Blue Smoke bad?
Blue/gray exhaust smoke means there’s likely an oil leak and your engine is burning oil. Time to have a qualified technician check things out. The leak could be caused by several issues like leaking valve seals, damaged piston rings, or worn cylinder walls.
Can low oil cause smoke?
Generally, blue smoke is caused by oil seeping into the engine and being burned along with the fuel. Your engine will be low on oil, as well. There is also the possibility that there is an external oil leak, and the oil is dripping onto the exhaust system.
What does GREY smoke mean?
Grey smoke can indicate that the fire is slowing down and running out of materials to burn.
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.
Why does my car throw blue smoke?
Blue Smoke From Tailpipe
A blue or grey colored smoke is typically caused by an engine that’s burning a significant amount of oil. If you’re lucky, this can be caused by a blocked PCV valve, which can start sucking oil into the engine. Fixing this problem is typically as easy as replacing that valve with a new one.
Will thicker oil stop Blue Smoke?
These seals prevent oil from leaking down the valve stems into the combustion chambers. As the vehicle sits after being operated, oil accumulates in the cylinders, and when the engine is restarted later, the accumulated oil burns off. … Thicker oil may not stop smoking at startup. It could; but not always.