White or Black Smoke from Exhaust Problems

Exhaust smoke cigarettes is a means of your vehicle interacting with you to state what is incorrect. Usually, the smoke cigarettes that obtain emitted is dark, white, greyish and blue. The exhaust gases can be an outdated school method to identify symptoms of complications i.e. huge amounts of dark smoke may suggest the EGR is certainly blocked and its own over fueling.

Understanding the difference between your smoke that originates from the exhaust is quite useful. If you're not going to fix the car yourself, take note when the smoke appears and the color and report back again to your mechanic. Preventing the problem is only going to shorten the life span from the engine and bring about needless repair expenses.

This post will cover the various smokes that show up for different fuels. This will ideally put your brain at ease and present you a concept of what your vehicle is wanting to let you know.

Desk of Material

Why is Blue or White colored Smoke Coming out of my Exhaust?

White smoke has a varying amount of causes and symptoms, which are more common in gasoline cars. The most common cause of white smoke is when the car has just been started. Do not be worried about this , the white smoke is just steam from condensation that clears as the car warms up.

In my experience, thinner or clearer white smoke is not something that causes me to take action. However, if the smoke is solid and usually smelly, I will be looking for the route cause as soon as possible.

Blue/White colored Smoke from Petrol/Gas Car

White smoke as mentioned is definitely typical from startup however if it continues when warm, you have a problem. Check the following for white smoke causes in petrol cars:

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  1. Head Gasket Failing .
    A common problem with cars which have been neglected or just the gasket has already reached the finish of its life expectancy. Use a mind gasket sealer and examining to find out if any smoke cigarettes appears and you'll have located the problem.
  2. Turbo Problems .
    The turbo generally emits white or gray smoke that mainly shows up under acceleration. Much less common but seals and pushes perform fail and turbos complications worsen with later years.
  3. Burning up Essential oil .
    Blended with a blueish smoke cigarettes and a unique smells, burning essential oil is normally emitted through the exhaust. Some Causes such as bad valve guidebook seals, piston rings or PCV and more. Always where possible use fully synthetic motor oil when changing your oil.
  4. Overheating Engine .
    In some cases, certain engines tend to bellow out white smoke when they are too hot. Examine the temperature the next time there is certainly white smoke cigarettes. If its overheating, consider potential causes, such as for example broken enthusiasts or no drinking water.
  5. Damaged Engine Stop .
    Not really that common but a damaged engine stop will push white smoke towards the exhaust. This type of harm to the stop can cause a vehicle to become created off from the insurance firms.


Blue/White colored Smoke from Diesel Car

Sadly, white smoke from a diesel car operating at its optimum temperature is bad news in most cases. Check for the following for white smoke in diesel cars:


  1. Worn or Leaking Injectors.
    The seals on the fuel injectors are prone to breaking down and eventually leak. This can cause a blueish/white smoke to bellow from the exhaust. Take a look on your engine bay to see if there are any signs of leakage, generally by means of dark carbon build-up.
  2. LOW QUALITY Diesel .
    Frequently poor quality energy could cause a blueish mixture of white smoke cigarettes to emit through the exhaust. Its often best to make use of top quality injector cleaner to take care of your diesel energy.
  3. Low Cylinder Compression .
    Generally caused from other components such as piston rings becoming worn out
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Why is Black Smoke Coming out of my Exhaust?

Black smoke that gets emitted from a car is more common in diesel cars. Apart from when the car is cold, white smoke should never appear from a diesel car exhaust. The majority of older diesel cars will bellow black smoke under heavy acceleration but new diesels will not emit any black smoke.


Black Smoke cigarettes from Petrol/Gas Car

Black smoke cigarettes in petrol/gas cars will can be often the consequence of a wealthy mixture through the distributor. This will leads to very poor kilometers per gallon and further tension on engine parts.


  1. Wealthy Blend .
    A wealthy fuel blend or air blend will cause dark smoke cigarettes under acceleration or revving. This is often a consequence of a distributor device providing too much fuel to the injectors or not enough air getting to the fuel. Some cars are tuned to run rich such as the Mitsubishi Evo.
  2. Not Enough Air .
    A clogged air filter or not enough air getting to the intake system completely offsets the air to fuel ratio.


Petrol engines very rarely emit black smoke from your exhaust compared with diesel cars. In almost all conditions, black smoke from a petrol car is due to the air to fuel percentage.

Black Smoke from Diesel Car

Black smoke from a diesel car is the result of poor combustion of the fuel. In my experience, the issue is either due to insufficient air flow or poor quality diesel that builds up into a carbon deposit. Causes of black smokes from diesel car exhausts are the following:

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  1. Over Fueling or ECU Chip/Tuning/Remap .
    The term basically means that too much diesel is being pumped from the fuel pump. This has the potential to crack a cylinder head if its over fueling excessively. However, if the diesel car has been tuned or remapped, over fueling (and over boosting) is common. I had fashioned a 1.9 TDi that was remapped, which would keep a black smoke cigarettes screen in my own back mirror under heavy acceleration.
  2. Faulty Turbocharger and Poor Air to Energy Percentage .
    Diesel energy requires a satisfactory air ratio to be able to perform since it should through the factory. The indegent ratio is normally triggered through a faulty turbo, filthy/old air conditioning filter and detectors that control ventilation. With a poor air to energy ratio, efficiency will be decreased significantly.
  3. Sticking Swirl Flaps, Clogged EGR and Inlet Manifold .
    Swirl flaps that are locked set up will usually trigger the blockage from the EGR (Exhaust Gas Recirculation) as well as the inlet manifold. Not merely will this stop air moving through, in addition, it causes a big black carbon build up that effect the performance massively. With the components blocked, any sort of acceleration causes large cloud of black smoke to exit the exhaust (I have experienced this plenty of times!).
  4. Poor Quality Diesel Fuel.
    Poor quality fuel will also cause black smoke (as well as white) to come from the exhaust. Using a diesel additive to clean vital components can fix this problem, which we recommend to do on a full tank basis.


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