8 Causes of White Smoke From Exhaust When Accelerating + Fix

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white smoke from exhaust when accelerating

As a car owner, you never want to discover your vehicle blowing an inappropriate amount of smoke; that is unacceptable. Regardless of the smoke’s color, a thick smoke blowing from your exhaust system may indicate irregularity or that something is wrong.

But how about when the smoke is white? In most circumstances, particularly during the winter or cold days, little white smoke coming out of your exhaust is typical and causes no concern. However, other factors may be a reason for worry.

White smoke from the exhaust while accelerating is one such alarming indicator. As a general rule of thumb, the denser white smoke you see, the worse the situation is. Trust me; this issue needs to be managed as soon as possible, ignoring this kind of problem may lead to engine trouble.

Continue reading to learn why this occurs and when you should be concerned about resolving the problem.

Causes of White Smoke Coming Out of Your Exhaust

Some reasons for this issue are mild and can be quickly resolved without causing any problems. However, there are also more instances why white smoke is emitted that are much more significant and may result in additional serious issues.

Leaking Oil

If engine oil suddenly leaks out of your valve seals or piston rings, it would mix with the fuel in the internal combustion chamber. Whenever the oil and fuel are combined, smoke begins to emanate from the exhaust. Your exhaust will most likely emit a blue-ish hue smoke; however, to some folks may look like white-ish smoke.

Naturally, you’d want to repair this leak fast since if the engine components are not adequately lubricated with oil, they’ll begin to wear down and damage very rapidly. This will result in a whole new set of costly troubles that you do not want.

Cracked Cylinder Head

If your car’s got a cracked cylinder head, the coolant begins to seep from it. Additionally, this does not have to be a large crack to cause the issue. It only takes a small amount of coolant to seep out and blend with the engine oil.

When this issue occurs, the engine oil will then become polluted. White smoke coming from the exhaust pipe is the first indicator of contaminated oil. As this process progresses, the white smoke develops a distinct odor.

Condensation Burn Off

Do not instinctively expect the worst if you observe white smoke emission from your tailpipe. You may not need to be concerned since this could simply be the accumulation of condensation.

Typically, you may notice this white smoke emanate from these circumstances on colder days. Once you start your engine, just a little quantity of smoke should escape. After around 30 seconds to about a minute, the white smoke must dissipate.

If this happens, you need not be worried. However, if you still see white smoke from the exhaust when accelerating, there might be a serious issue that needs to be addressed immediately.

Coolant Internal Leak

After your engine has warmed up and you still see white smoke from the exhaust when accelerating, this is a clue that your car may have a coolant leaking in one of your car’s piping or engine. When the coolant leaks, your engine will not cool itself properly or supply enough lubrication for the moving components, resulting in overheating and an excessive response.

The clearest sign of coolant leakage in your automobile is white smoke emerging from the exhaust, leaving a recognizable stench. If you detect white smoke from the tailpipe and the smoke smells sweet, this may be directly attributed to your car’s coolant leaking.

The primary cause for a coolant leakage is that there might be damage to the internal engine components or the cylinder head. The cylinder head is located atop the cylinders or the cylinder block and contains parts such as the intake and exhaust valves that assist in cooling the engine.

Even though the fracture is tiny and insignificant, it may still allow coolant to seep out and pollute the majority of your engine, resulting in white smoke from the exhaust.

When you discover coolant seeping from your car and the coolant reservoir tank is low, your engine may quickly overheat due to the extreme temperature and friction. This results in head gasket failure due to the engine’s inability to seal correctly.

Engine Control Unit (ECU) Error

If your car has a malfunctioning engine control unit (ECU), the timing of the fuel injectors may be thrown off, causing the white smoke to come out of your exhaust. This does not imply that the fuel injector is broken in any way. This means that you must repair or reconfigure the engine control unit to adjust the fuel injector timing.

Usually, you may resolve the problem by unplugging your vehicle battery for a couple of minutes to reset the system. However, if you can’t do so, you will need to visit your dealership to have this done since it needs experienced technicians experienced with your car to reset the ECU.

Failing Fuel Injectors

A malfunctioning fuel injector is often jammed open or has an o-ring leak that will supply too much fuel to the car’s combustion chamber. Too much fuel cannot be burned correctly in the engine but instead escapes via the exhaust as white smoke.

The problematic aspect is determining which fuel injector is faulty, and relying on the car’s mileage, many technicians may suggest replacing all of the injectors, as they are pretty inexpensive in the majority of situations.

Transmission Fluid

When you detect white smoke from the exhaust when accelerating or even during start-up and warm-up, this indicates that your vehicle’s engine is absorbing too much transmission fluid from the vacuum hose or line, resulting in burning oil and a noticeable burnt smell.

Cracked Engine Block

Having a cracked engine block may be the worst-case scenario. These are the kind of issues that might be the most expensive to resolve since the engine block covers the entirety of your car’s engine. You’re unlikely to understand which of these issues leads the white smoke to be produced unless you have a professional mechanic inspect and diagnose your car.

How To Diagnose and Fix White Smoke From Exhaust?

mechanic diagnosing white smoke from exhaust

When your car is functioning correctly, you’ll notice only a little smoke coming from the exhaust. Your vehicle’s emissions control system is intended to handle the majority of exhaust emissions. If your car is blowing white smoke from the exhaust while accelerating or even just during the start-up, there is an issue that requires attention.

Below is the list of things you need to check and examine or replace once you notice that white smoke from the exhaust pipe.

Hey! The following are potential solutions to your “white smoke from exhaust” issue. Here’s a word of warning. Suppose you are unfamiliar with vehicle components or cannot determine the problem, it is recommended that you take your car to a certified auto repair shop or mechanic to get it repaired. A poor repair will worsen the existing issue and result in further difficulties in the future, which will incur additional expenses and time to fix.

Examine the Engine Block

Check and examine your engine block for cracks. There are three primary methods for repairing a cracked engine block. You may use cold-metal patching to cover the crack, cold-metal stitching, or rewelding the crack.

These tasks need expert assistance and are rather costly. The cost of labor for engine block repair may vary depending on the type of your vehicle since some vehicles are more difficult to access than others depending on the kind and manufacture of your car.

A temporary repair for this issue might cost between $2,500 and $4,000.

Examine the Intake Manifold Gasket

Your intake manifold gasket should be examined before the head gasket. The intake manifold gasket is responsible for the transportation of oxygen and coolant to the car’s engine. If it forms a crack, your engine can overheat due to the air and coolant seeping out.

Because it is primarily composed of high temp plastic or rubber, too much heat may be a severe danger to such a gasket. Do not be concerned. It is fixable if spotted early enough!

Examine the Head Gasket

If there is no issue with your intake manifold gasket, the head gasket must be examined next. The head gasket’s purpose is to secure the engine block and prevent coolant from entering the cylinder. Suppose you discover a crack in your head gasket. Avoid running your car long and replace it as soon as possible.

Examine the Cylinder Head

The cylinder head is one of the critical components of your car’s engine since it links the engine block and head gasket. Due to the higher possibility of aluminum heads warping or breaking due to overheating, they must be changed promptly if any fracture is discovered during the examination.

Examine the Fuel Injector

Your car’s injectors may get clogged with carbon and sediment and cease to function correctly. However, commercial fuel injector cleaners can remove them, which are available at most auto shops!

Other Exhaust Smoke Colors

car emit white smoke

It’s natural to think that there is nothing to be concerned about as long as your vehicle is operational. However, if you observe any colored smoke coming from the exhaust, this might signify that a mechanical issue is on the way.

The color of the smoke that blows out of your tailpipe might indicate a variety of things, including what may be wrong. Continue reading for additional information worth noting.

But hey! Please see an experienced mechanic first if your car runs on a diesel engine. The below information applies to gas engines only and may not apply to your automobile.

Light or Thin Vapor

Typically, thin or light-colored exhaust smoke is just water vapor. You’ll see it immediately when starting your automobile, particularly on a chilly day. This occurs as a result of condensation typically accumulating in the exhaust system. Vehicles often emit this exhaust smoke.

Gray or Blue Smoke

Gray or blue smoke from the exhaust is not normal; it indicates that your engine is most likely leaking oil internally and burning it. It’s essential to have a certified specialist inspect the situation. Leaks may be produced by various factors, including leaky valve seals, faulty piston rings, or deteriorated cylinder walls.

Dark Grey or Black Smoke

When an engine burns excessive gasoline, dark gray or black smoke may occur. This might be due to a clogged air filter, irregular fuel pressure and damaged fuel injection mechanism, a clogged manifold, or any number of other factors.

A clogged air filter will not affect your gas consumption due to modern automobile technology, but you will pay the price in terms of performance. Consult a specialist to determine why your car burns more gasoline than average, and produces a cloud of black smoke.


You only need to stop worrying about white smoke if it passes within a bit of while of start-up or warm-up. If it persists for an extended period, or when you look at your rearview mirror and see that white smoke from the exhaust when accelerating, you must identify which of the factors listed above is causing the issue and seek professional help to resolve it. By addressing the white smoke from the exhaust, you may avoid possible fuel system difficulties, fuel injection system troubles, engine and transmission problems caused by an accumulation of unburnt gasoline and vapors.


Does white smoke always mean blown head gasket?

A cloud of smoke is one of the most prevalent symptoms of a blown head gasket. White smoke signifies that coolant is being burned in your engine due to a leak in the cylinders. Another sign of a broken head gasket is the existence of coolant in the oil, which may negatively affect the oil’s lubricating properties. Examine your engine’s dipstick for a whitish material, evidence of water, or dark, bubbling oil.

Can I drive with white smoke from the exhaust?

Experts warn against continuing to drive the vehicle. If proven that a gasket failure or a crack in your engine is causing the white smoke, it might result in overheating or more contaminations, which actually means “Bye, engine.”

Why is my car smoking when I accelerate?

Suppose your vehicle is smoking when you hit the gas and accelerate. In that case, it might be a simple issue that simply requires adjustment or minor repairs, or it could be an indication that something is severely incorrect with your car’s engine. The color of the smoke from your exhaust, whether it’s white, blue, gray, or black smoke can indicate the severity of the issue. Consult your trusted mechanic if the problem is confusing to you.

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