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Blowing blue smoke - F-150 Ford Cars & Trucks

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Blowing blue smoke means burning oil. a compression test can help pin point where oil is leaking in the cylinder(s). remove all of the spark plugs and check the compression pressures of each cylinder. If the lowest pressure reading is within 10%-15%, you can assume that the lower half of the engine is Ok. one at a time, squirt a few drops of engine oil in the spark plug hole and check the compression pressures again. a big increase in pressure means poor piston rings. very little or no difference in pressure means valve train leaks. like valve guides or seals.

Posted on Oct 20, 2013

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Why is my 2000 kia sephia blowing blue smoke from the tailpipe. it has 86,000 miles. the check oil warning light is on even though the dipstick reads full.


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. This is most frequently seen in older or high mileage cars with worn seals and gaskets. It only requires a very small amount of oil leaking into the cylinders to cause excessive blue exhaust smoke.

Blue exhaust smoke only at start-up can indicate worn piston seals or damaged or worn valve guides which may also cause a rattling noise. An external engine oil leak can drip onto hot engine and exhaust parts causing what appears to be blue exhaust smoke. Other possible causes of blue exhaust smoke include: piston wear, worn valve seals, a dirty or non-functioning PCV valve, worn piston rings, an intake manifold gasket leak, worn engine oil seals and possibly even head gasket failure.

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. Internal engine oil leaks can also allow fuel to mix with the oil in the crankcase which will degrade the oil and prevent it from adequately protecting the engine.

Operating a car with a severely dirty oil filter, air filter or improperly functioning PCV valve can also sometimes result in engine oil blow-by, oil loss and blue exhaust smoke. Periodically checking the engine oil level with the oil dip stick will indicate if there is excessive oil consumption. Higher viscosity engine oil can sometimes temporarily reduce the amount of blow-by; however, this is not generally recommended. Excessive blue exhaust smoke indicates a possible internal engine oil leak that should be inspected by an ASE certified mechanic.

Dec 08, 2014 | 2000 Kia Sephia

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Blowing blue smoke


Hi can you tell me make and model. Does the car blow blue smoke all the time and other than smoke any other symptons? poor starting , power loss etc.
I had a similar problem on a golf gti after servicing drove very well but smoked on start up, and found to be the high grade fully synthetic oil recommended by the factors was simply too thin, and thus giving me by pass on worn valve seals and pistons on older engine sometimes a thicker grade oil is better.

Dec 01, 2013 | Audi Cars & Trucks

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95 ford probe car runs ok but blows whitish blue smoke as accelerate


That is probably the head gasket leaking. White smoke is from antifreeze going through the exhaust. The engine compression is pushing the water out of the radiator.

Nov 27, 2013 | 1995 Ford Probe

1 Answer

Aux heater blowing blue smoke but no heat


That may be antifreeze mist you see. check the heater core

Nov 22, 2013 | Chrysler Cars & Trucks

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2008 6.4 f350. blowing tons of blue smoke for the last 12 months


Blue smoke means burning oil. Black smoke means running too rich (too much fuel in the air/fuel mix). If it is blue smoke:
If it blows blue smoke only shortly after starting, it means oil is leaking into the cylinders from above, through the valves. This us typical of older engines, and can be repaired without removing the engine from the truck (although it is still expensive). A 2008 should not have this kind of problem.
If it blows blue smoke all the time, it is bad piston rings or scored cylinder walls. Oil is leaking from below up into the cylinders. This is bad news - any solution will require removing the engine from the truck and complete disassembly (i.e. a rebuild). No engine oil treatment will make it go away, regardless of what the label says.
It is very, very rare in modern engines for a well maintained vehicle with less than 100K miles to need a rebuild. Damage such as this usually comes from not changing oil AND the oil filter often enough. 3-4000 miles for conventional oil or 6-8000 miles for synthetics. If using synthetic, be sure to get a high quality filter designed to be effective for the synthetic oil change interval.

Nov 03, 2013 | 2000 Ford F350 Super Duty Super Cab

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Engines idle goes up and down after warming up and blows blue smoke


If the engine idles for a while then blows blue smoke this is an indication of oil passing the valve stem seals and being burnt in the combustion process. ( When you are at lights and they change and you accelerate away leacing a cloud of blue smoke this is worn valve guides and failed valve stem seals) As for the idle it could be the oxygen sensor is coated with oil and soot and is malfunctioning henace the cpu cannot regulate the fuel setting correctly. Have the valve seals replaced and clean the Oxygen sensor and check for other fault codes

Feb 17, 2013 | Cars & Trucks

1 Answer

Blue smoke and idel's rough


blue smoke is oil burning, it is call blow by, where oil gets by the valve seals and burns

Nov 28, 2012 | 1997 Ford Thunderbird LX

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