Causes of Blue Smoke From the Exhaust of a Truck

The exhaust gases can tell you a lot about the condition of your truck. But what are the causes of blue smoke from the exhaust of the truck? When everything is working in perfect condition, your truck will emit a thin white smoke or very light smoke accompanied by water vapor. If you see blue smoke from your truck exhaust, something is wrong, and you should fix it immediately.

What are some of the Causes of Blue Smoke from the Exhaust?

Various reasons can lead to the emission of blue smoke from your truck. This guide will help you understand the common cause such as oil problems, turbochargers, or PCV valves.

Presence of Oil in the Combustion Chamber

The combustion chamber is composed of pistons, cylinders, and valves. The primary role of oil in the engine is to lubricate the moving parts. Pistons move in the cylinders, so they must be lubricated. The pistons have piston rings that ensure that oil does leak into the combustion chamber.

If the piston rings wear out, the oil will leak into the combustion chamber. It will mix with fuel and air. When this mixture burns, it produces blue smoke. A cracked valve seal also leads to oil mixing with fuel and air in the combustion chamber.

Faulty Turbocharger

If your truck has a turbocharger that has blown out, you will see blue smoke from the exhaust. It can also result from a leaking oil seal. Oil will seep into the engine, and if this happens, it will mix with fuel, producing blue smoke from the exhaust system.

Faulty Piston Rings

The pistons’ rings keep oil in the combustion chamber at its right position. Oil is not supposed to move into the combustion chamber. Oil will find itself in the combustion chamber when the piston rings are damaged or faulty.

As air, fuel, and oil mix, you will see blue smoke from the exhaust of your truck. Unfortunately, it is pretty costly to replace the piston rings.

Dripping Oil

When something is wrong with your truck, and hot oil starts to drip from the engine, there is a high chance this oil will come into contact with the hot areas of the engine. When this happens, you will see blue smoke as you accelerate. The blue smoke will result from oil hitting up the engine block. Such does not come from the exhaust, but it will look like it is.

Suppose oil drops from a blown gasket in the engine block. It will make its way into the hot exhaust, which will produce blue smoke.

Faulty PCV Valve

The positive crankcase ventilation does the role of releasing pressure that accumulates in the oil pan. The released pressure goes to the intake manifold for the fumes to be re-burned. When the PCV is stuck, the oil will mix with air and other gases. The intake manifold is connected to the air filter, which produces blue smoke.


The production of blue smoke is common, especially when part of your truck’s engine starts to wear out. When you see blue smoke from the exhaust of your truck, these are some of the common causes that you should pay attention to when doing maintenance

Water Coming Out of Exhaust – Why Water Is Coming Out of My Truck Exhaust?

If you have experienced water coming out of exhaust, then it should ease your mind to know that you can easily know the problem. Trucks have an internal combustion engine whose by-product is exhaust gases. After complete combustion, the outlet valve of the combustion chamber will open to let the exhaust fumes into the exhaust system. The exhaust system has various components, from the engine to the tailpipe. At some point, you will observe water coming out of your tailpipe, which might signal leakages from the exhaust system. 

Water Coming Out of Exhaust

Water coming out of exhaust should not make you worry because it does not symbolize any serious issue with your truck. But it is necessary to find out the actual cause of water from the exhaust system and fix it as soon as possible. Doing this will enable you to troubleshoot your truck and fix it. Here are some of the reasons why water might come out of your exhaust system.

Hot Engine

The engine will be heated most when you start your truck for the first time in the day. The oil will flow to various parts to cool down and lubricate your engine. Before this happens, your engine and the exhaust system will be very hot. If it is cold, you will see water droplets from the tailpipe of your truck for a while before drying up.

Condensation of Water in the Engine

During combustion, your truck will produce some pollutants, such as carbon dioxide, nitrogen, and water vapor. When the exhaust fumes are exiting the combustion chamber, water and carbon dioxide mix as your engine is cooling down, and as this happens, you will be able to see condensed water from your exhaust pipe.

The Catalytic Converter Performing its Role

Water coming out of exhaust might not be a bad thing after all. The catalytic converter is an essential part of the exhaust system. During combustion, harmful gases are produced, and the catalytic converter has metallic components which neutralize the harmful gases by initiating chemical reactions. During such reactions, the harmful gases are reduced to an environmentally friendly substance such as water. On most occasions, the reactions in the catalytic converter make your truck produce water from the exhaust pipe.

Faulty Head Gasket 

A faulty head gasket is a serious problem for your truck which you should address as soon as possible. When your head gasket is blown, your truck will white smoke accompanied by water droplets. You will also be able to witness air bubbles in your coolant reservoir and also overheating problems.

Damaged Pistons and Rings

Damaged pistons and rings can make your truck produce water from the exhaust system. To determine this, you will see smoke accompanied by water coming out of your exhaust system. Sometimes, when this issue is worse, the smoke will be accompanied by a sweet smell. In this case, you need to stop immediately and seek mechanical assistance.


Having looked at some of the causes of water coming out of exhaust, we hope it helps you easily deal with it. The effects of water vapor are the most common cause of water droplets from the tailpipe. You will experience this when you start your truck on a cold morning. Sometimes, the presence of water might signal serious issues which you will have to fix for your truck to keep serving you. 

Tips To Reduce Exhaust Smoke From Diesel Trucks

Many people have an attitude towards diesel engines because they are smoky and loud. All diesel-powered trucks emit black smoke. If you become a victim, never hesitate because this problem is easy to fix. This guide will focus on why diesel-powered trucks emit too much smoke and the solution. In this comprehensive guide, we will go through some of the tips to reduce exhaust smoke from diesel trucks.

Tips To Reduce Exhaust Smoke From Diesel Trucks

Change your Air Filter

Black smoke is evidence of partial fuel combustion in the combustion chamber. When your truck is ni motion, the engine burns fuel and oxygen to produce water and CO2. The production of black smoke indicates that the fuel is not getting adequate oxygen to mix within the combustion chamber because the air filter is clogged. 

The engine’s inability to receive adequate amount f oxygen creates an imbalance, and you will feel your truck is losing power when you press the acceleration pedal.

To fix this problem, replace your air filter. It is recommended that when you do an oil change, consider changing all the filters in your truck. 

Clean the MAF Sensor

The bad MAF sensor interferes with the air-fuel ratio necessary to support combustion in the cylinders. The mass air flow sensor ensures that the amount of fuel and air getting into the combustion chamber is equals.

A faulty MAF sensor will not give the correct readings of airflow, which is getting into the combustion chamber. In such a scenario, your truck will have no option but to produce black smoke.

When the MAF sensor becomes faulty, you will see the engine check light and black smoke from your exhaust pipe. To correct this, consider replacing your MAF.

Use Diesel Additive

Using diesel additives is the easiest way to reduce diesel truck emissions. However, it does not solve all your engine problems. If you have an old diesel truck, smoke emissions might result from carbon build-up within the system. Additives clean carbon build-up within the engine. For the best results, consider using a high-quality additive.

 Diesel additive fixes the problem of black smoke. There are various diesel additives in the market and different ingredients.

Perform a Regular Inspection of Your Fuel System

The fuel system has various parts. If a single part is faulty, your truck will emit more smoke. Check the condition of the fuel filter, EGR system, and fuel injectors. Your truck will be smoky when your fuel filter or the EGR is faulty. Sometimes, the fuel injectors might get clogged and fail to deliver the required amount of fuel in the combustion chamber. Consider checking the trouble codes to take care of your fuel system.

When the diesel engine does not receive the right fuel, you will see black smoke from the exhaust pipe. The truck will start to consume too much fuel. To fix this problem, inspect the fuel system and replace the worn-out parts.


Production of smoke by your diesel truck can lower your self-esteem, especially when driving in a set-up where everyone advocates for the conservation of the environment. This guide has highlighted causes and solutions to the diesel-powered engine’s emission of too much smoke.

How To Install An Exhaust System in Your Truck

The combustion chamber of your truck has two valves, the intake valve, and the exhaust valve. The exhaust valves expel the waste products of combustion from the engine’s combustion chamber. The exhaust system is connected to the engine to help expel exhaust gases and other harmful substances from the engine. Apart from removing the exhaust substances, the exhaust system reduces the engine noises and neutralizes the toxic gases from the combustion chamber. 

Several factors can make you install a new exhaust system, maybe you love the aftermarket exhaust system, or the one your truck has is faulty. You can fix an exhaust system without disturbing your engine. You only need some special tools to do this. 

Steps On How To Install An Exhaust System in Your Truck

Consider doing the following to install an exhaust system in your truck. Let your truck cool down for safety before working on the exhaust system.

Lift Your Truck

The exhaust system is located below your truck. Before removing the current one, lift your truck. Spend time studying the parts of the exhaust system. If possible, at this point, you can take a photo of your exhaust system.  

Uninstall the Old Exhaust System 

After studying the exhaust system, remove your truck’s old exhaust system. To remove the exhaust system, you have to follow some specific steps.

  1. You will have to disconnect the oxygen sensor. This exhaust system component checks whether the engine burns the oxygen well. To remove the oxygen sensor, identify the bolts holding it in place and use a wrench to rotate them counterclockwise. The oxygen sensor has wires which connect to your truck. Before disconnecting these wires, consider pulling them out first. 
  2. Use a penetrating fluid to spray the nuts holding the exhaust pipe. The nuts holding the exhaust system are tightly tightened, and they might have dirt or rust, which makes them tighter. To untighten them easily, consider spraying the penetrating fluid, which will soften them. 
  3. Use a ratchet to unscrew the nuts. To safely remove the nuts, start with those that hold the exhaust system to the engine. They are located at the front of your truck. When doing this, assemble several ratchets and use the one which matches every nut. 
  4. Slide the metal pin out of the rubber. At this point, all the nuts are down. You will see the metal pins that extend into rubber rings on the body of your truck. Remove these pins, and your exhaust system will be freely suspended for you to lower it down. 

Install the New Exhaust System

Ensure the exhaust system you want to install matches the make and model of your truck. The system you are about to fix should be made of stainless steel to prevent it from rusting. Use the picture you previously took to compare the layout of the old and the new exhaust system. If they match perfectly, consider installing them in your truck. 


This guide has insightful information which will help you to install the exhaust system on your own. Consider the help of a professional mechanic if you are unsure what to do.