Blue Smoke Coming From The Car Exhaust ? ( Its Causes and How to fix it)

The car exhaust can reveal much about the health of your car. When everything is functioning properly the car exhaust will appear to be extremely thin or small clouds of water vapour. If you’re seeing an emission of blue smoke this is a sign something is not working properly.

We look at the most common causes of blue smoke coming from the car exhaust. The article also provides some tips for solving the issue once and all.

What exactly is Blue Smoke from car Exhaust?

Blue smoke develops when gasoline is mixed with oil in the combustion process. It could also be caused by the oil spilling onto hot parts of the engine. In certain instances blue exhaust smoke could be an indication that a component is failing, like the PCV valve or the turbocharger.

If you notice blue smoke It means that fuel is burning and exiting the car exhaust pipe along with the burnt fuel. Whatever the reason the vehicle is running poorly and needs to be fixed.

Blue Smoke is a result of car exhaust Causes

1. The combustion chamber contains oil.

Combustion Car

As the engine gets older piston rings seals, valve seals and other crucial components begin getting worn out. Wear is more rapid in the event that you do not make regular oil changes since the oil that is contaminated is less effective in reducing friction.

When the valve seals are broken and brittle It is much less likely that it will keep liquids separated. This is when oil begins to mix with the combustion chamber’s fuel.

The blue smoke that comes from the car exhaust usually indicates an oil build-up within the chamber of combustion. Sometimes it is due to worn piston rings this means that you’ll require replacing the engine.

2. Blown Turbocharger


If the turbo has gone out, there’s an opportunity for blue smoke coming out from the car exhaust. A damaged turbo could be damaged ones or damaged, but it can also be due to a leak in the oil seal.

In any of these situations there is an oil leak into the engine. Once the oil infiltrates an engine’s interior, it reacts with fuel, resulting in blue smoke.

3. Piston Ring Damage

Piston Ring Function

Piston rings were designed to ensure that the engine oil stays exactly where it belongs: in the chamber of combustion. If they fail, oil may get into an unsuitable area.

4. Dripping Oil

Exhaust Manifold

If there’s something going on with the car and the hot fluid is flowing from the motor, it’s likely that it’s making contact with hot components under the under hood. When your car speeds up, you could observe blue smoke coming from the rear of the car due to the oil striking the engine block. Check out the second hand cars in Nigeria. Although this doesn’t come from the car exhaust system, it may appear as if it’s.

Oil may leak from an exploded gasket inside the block of an engine. If it leaks out, it dribbles to the car exhaust that is hot and causes blue smoke. It could also be leaking onto the headers, which can cause blue smoke.

5. Stuck PCV Valve

Pcv Valve

Its Positive Crankcase Ventilation (PCV) Valve can produce blue smoke to come out of the car exhaust. The valve’s function is dislodging the pressure build-up within the pan of oil. The pressure is then channeled through the intake manifold so that the fumes are able to be burned again.

When the PCV valve gets stuck, the oil mixes with other gases and air. Since the intake manifold linked with the filter for air, this could cause blue smoke.

Repair the Blue Smoke from the car exhaust

1. Eliminate Excessive Oil

The most basic solution is to eliminate some of the oil from the system. This solution only works when the blue smoke emitted immediately after an oil change.

It’s possible that there’s excess fluid in your system. This can cause aeration and pressure, which makes it difficult for your engine to manage the friction and heat. To fix this problem take out enough of the oil that the levels are right.

2. Clean Engine

If your engine hasn’t been cleaned in a while it’s time to have a look. When dirt accumulates within your engine it could cause blockages to the holes for oil return in the head of the cylinder, leading to leaks.

The valve cover should be removed and scrub off any dirt that you find. It is also important to clear the drain holes. Wipe the engine down to ensure that there isn’t leftover oil that can create blue smoke.

3. Replace Piston Rings

The damage to the piston rings can result in blue smoke, however this isn’t an issue which is easy to address. Although the piston rings may be priced at around $50 per, the work is causing the price to become quite expensive. Check out the Honda Nigeria price list.

The engine has to be taken apart and removed in order to access the rings. You should expect to pay at least $1,000 until the whole job is done.

4. Fix Turbocharger

If your turbocharger has blown it is imperative to stop driving immediately. Driving a vehicle that has a turbo blowing can result in more severe issues.

Metal fragments can develop because there isn’t any lubrication inside the turbocharger. Metal can be introduced into the engine, which can lead to irreparable harm.

5. Replace PCV Valve

It’s not expensive to repair the valve PCV. Additionally, the process is easy. Find the tube connecting the intake manifold and the valve cover, and follow it until you spot the valve for PCV.

Remove the valve and replace it with a fresh one. If you place it in the proper position, everything will function exactly as it should, perhaps fixing the blue smoke problem.