Why do cummins engines smoke

If your air filter is dirty or clogged, you should consider cleaning it or even better — replacing it. Check your engine rings. This will prevent the black smoke too. Check the fuel supply. The timing of fuel injection is important too. If the injected fuel is too much, incomplete combustion will occur. The right action is to have the fuel pump and the injection system inspected by a professional mechanic. Use fuel additives. Driving a diesel car daily with a regular fuel could cause a debris build-up in the cylinder chamber and fuel injectors.

This will result in a lower performance of the engine and therefore, a lower fuel economy. If a correctly maintained diesel engine smokes at any other time, it indicates a problem. Identifying this problem begins by examining the smoke. Different exhaust colours give clues about what type of repairs the diesel fuel injection system will need.

In most cases, the smoke coming from your vehicle will not be pitch black but instead a dark or dirty gray color. This occurs when unburnt fuel blows out of the combustion chamber and mixes with the normal gasses found in the exhaust.

If dark smoke is visible, the car or truck most likely has one of these issues:. This issue relates to the incorrect use of fuel within the fuel injection system. Either excess fuel, low-grade fuel, lack of air, or lack of appropriate time to burn the fuel is the culprit. If black or gray smoke comes out in the exhaust, the vehicle may also be experiencing low fuel economy and lack of power. Fixing this problem may pay for itself with increased miles per gallon.

This could happen because the head gasket has blown, the cylinder head is damaged or the engine block could be cracked. White smoke can also be a sign of fuel passing through the engine and reaching the exhaust without having been burned.

Diesel Extreme is the go-to solution for this color smoke since it attacks many of these issues. This improvement allows fuel to ignite properly at a more desirable temperature once it enters the combustion chamber. Diesel Extreme is one of the most powerful detergents on the market. We also offer Gasoline Extreme for gasoline engines. It can help attack many of the common causes of white smoke by cleaning fuel injectors, pistons, pumps, valves and more, while also restoring fuel performance.

Another fix for white exhaust smoke might include adding an automatic pre-heater or a complete replacement of your engine, depending on the issue. A little black smoke is normal on a properly functioning diesel — in fact, some diesel owners add larger injectors to create more black smoke. Stiction Eliminator is a great place to start when trying to get rid of black exhaust smoke.

It will make sure the turbo internals, camshaft, and HEUI injectors are cleaned and lubricated. It can help restore compression, ensuring that the combustion chamber is at optimal performance.

For other situations, a dose of Diesel Extreme might be what you need to clean out those injectors coked with burnt fuel and get them firing like new. You can also try replacing your air filter, checking the intake manifold out, or fiddling with your aftermarket tuner.