Why White Smoke From Exhaust When Accelerating?


Noticing a white cloud of smoke coming out of your exhaust when accelerating isn’t always a cause for worry or panic; nonetheless, it warrants a thorough and careful examination to determine how to proceed in the safest way possible. 

White smoke usually comes out from the exhaust when accelerating due to condensation. It could also be caused by a cracked head gasket, oil leak, defective fuel injector, or cracked engine block.

Depending on the temperature, car model, and many other circumstantial factors, there can be some very usual scenarios where this phenomenon doesn’t signal any inherent damage. But your safety should always be your number one priority on the road, so I’ll take you through each of these possible causes and how to notice and fix them properly. 

White Smoke From the Exhaust Could Be Harmless or Harmful

As I mentioned, the possible root causes of this problem can range from harmless to seriously threatening. That’s why learning about each scenario can save you a lot of time, effort, and worry in the long run. 

The White Smoke Results From Condensation

When noticing white smoke coming from your exhaust during acceleration, condensation is the most harmless possible cause. Luckily, it’s also one of the most common sources of the problem, especially for those living in colder climates. 

When hot gases coming out of your exhaust meet the cold outside air, condensation occurs, leading to the creation of a white cloud of smoke. If this is the case, the phenomenon should go away after a short period of driving without any further issues. 

So for those of you who are used to driving in hotter climates and have recently changed your environment, keep in mind not to panic when seeing white smoke coming from your exhaust, as it’s to be expected. 

Your Head Gasket Might Be Damaged

Another very common but less harmless cause for this problem is a damaged head gasket, a metal sheet situated between the cylinder head and its block. The role of this component is to seal the mechanism and prevent coolant leakage. 

As you can imagine, when a head gasket is cracked, damaged, or fully unfunctional, the coolant is no longer contained. This issue leads to the liquid leaking around the cylinder, where it will burn due to high temperatures. Inevitably, it will lead to a white flow of steam, a process catalyzed by high levels of pressure inside your exhaust. This flow of steam will then be released into the air, which is where you can identify it as a white cloud of smoke. 

If you suspect that a cracked head gasket is causing your problem, you need to stop your engine immediately. A dead giveaway that confirms this is the problem you’re dealing with is if you notice that the white smoke leaves a sweet, pleasant odor in the surrounding air. 

Be very careful when dealing with this scenario because if the leakage turns into a coolant flood, severe irreparable damage can occur to your vehicle. Furthermore, if there’s no more coolant left, your car can very quickly overheat, leading to a plethora of other damages and problems, including the ignition of a fire. 

You can often notice when the situation is deteriorating if the smoke changes color and turns black; therefore, make sure to react as quickly as possible after witnessing this problem by immediately shutting down the engine and asking for professional help. 

There Might Be an Oil Leak

On the other hand, oil leakages can be just as dangerous when it comes to your car’s ability to function properly. Due to wear or damage found on your piston rings and valves, sometimes oil can leak into the combustion chamber, where it mixes with fuel. 

This leads to an unusual white-ish smoke coming out of your tailpipe. I say white-ish because the smoke you’ll see is usually characterized by a blue tinge, caused by the fact that oil changes its chemical composition when it comes in contact with the high temperatures inside the engine. 

The best course of action to take, in this case, is to quickly take your vehicle to your nearest local mechanic right after noticing the blue-ish tinted smoke. If this isn’t an option for you, remember that although you can fix this issue with a bit of experience, you should never remove the coolant reservoir cap while your car is still running, as the engine’s high temperature can lead to serious injuries. 

Therefore, you should always wait for the vehicle to cool down before checking the coolant level. Doing so will allow you to locate where the leaks are coming from, making the repair process much more manageable. 

You Might Have a Defective Fuel Injector

If you notice a cloud of white (or gray-ish) smoke coming out of your exhaust pipe, another possible cause is a faulty fuel injector, which can also cause leakage. You can spot a malfunctioning injector by examining if it’s leaking from the o-ring or tuck open. This kind of damage will lead to the drive of an excessive amount of fuel into the combustion chamber. 

What happens, in this case, is that your engine can’t properly or fully burn the unnecessary amount of fuel in the chamber, which will force the excess material to come out as a cloud of smoke out of the tailpipe. 

If you think this is the root cause of the problem, you can try to replace the o-ring or repair any visible damages. With that said, the best solution would be to fully replace all your fuel injectors, as they are so affordable that in most cases, a simple repair it’s not worth taking on the added risk. 

Your Engine Block Might Be Cracked

If condensation is the best-case scenario, this is the worst. If your exhaust continues to emit white smoke for an extended amount of time, chances are there might be structural damages within your engine block. 

The smallest crack or opening can result in a significant amount of engine oil getting inside the cylinders, causing a dangerous compression loss in the process. Continuing to operate your vehicle in this condition can cause severe and irreparable damage, which is why it’s important to react quickly if you suspect a faulty engine block to be the cause of your problem. If so, immediately turn off your car and call local assistance lines for mechanical help. 

Tips for Fixing White Smoke Coming From the Exhaust 

While you can’t always fix some of these more serious causes yourself, knowing how to understand the type of problem you’re dealing with and checking for solutions you can or cannot execute yourself can prove to be immensely helpful in your day-to-day life. There are two simple steps you’ll need to take: 

Look for Any Possible Cracks or Leaks

The first and most crucial step is figuring out the nature of your problem. Therefore, you’ll need to look for any cracks or leaks that may have occurred. Here are some of the main components you’ll want to focus on: 

  • Head gasket 
  • Cylinder head 
  • Piston rings 
  • Valves 
  • Fuel injector 
  • Engine block 

Investing in an automotive diagnostic tool or scanner can help you immensely in this troubleshooting process, as many damages are visible to the naked eye, especially when you’re stressed or flustered. This handy electronic device can quickly confirm or pinpoint a problem, which will make it much easier to solve. 

Consider Repairing or Replacing

After finding the root cause of your problem, it’s time to determine whether the extent of the damage requires to be handled by a mechanic or if you’re able to take on the repair yourself. If the smoke is caused by a small removable blockage, a small crack, or an easily replaceable component, you can most likely fix the problem yourself if equipped with the necessary tools. 

Read the instructions thoroughly and don’t hesitate to call for professional help as soon as you feel it’s necessary, whether you need to: 

  • Replace a head gasket 
  • Repair a cracked engine block, or 
  • Stop a valve seal from leaking 


Although a simple condensation can often cause white smoke to come out of your exhaust pipe, this phenomenon can also signify that more serious damage or malfunction has occurred. Therefore, knowing how to find the cause of the problem and promptly fix it is essential in ensuring the well-functioning of your vehicle. 

Leave a Comment