Blue Smoke from Exhaust: Causes and Fix

What Does Blue Smoke Mean?

Blue smoke is one of the signs that a car engine shows when it is burning oil. Blue smoke will begin to show when the piston rings, the valve guide seals, or other components of the engine are worn or broken, and causes oil leaking.

The oil will start to flow into the combustion chamber before it begins to burn together with the fuel and create blue smoke. Aside from blue smoke, it also creates an awkward smell that is not healthy for you because it is not good to breathe in.

Major Causes Of Blue Smoke From Exhaust

There are numerous causes of blue smoke coming out of the exhaust, also, there are two types of blue smoke.

  1. Blue smoke from the exhaust when starting
  2. Blue smoke from the exhaust when accelerating

What Makes Blue Smoke From Exhaust When Starting?

1. Bad Valve Seals

If you begin to see blue smoke coming out of the exhaust immediately after you park your car and the engine is not a diesel, the probable culprit is bad valve seals.

All engines come with valves that open and close. These Valves are designed to open mechanically with pressure from a Rocker Arm so that air and gasoline come into the engine. After the combination of air and gasoline has been burnt, they let the exhaust gas out of the engine.

Oil will cover the top of the valves where the rocker’s arm applies pressure. There are valve seals that are designed to prevent this oil from flowing into the engine. If these valves are broken, immediately the oil will begin to come into the engine, and it will be burned by the air and gasoline, causing blue smoke.

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2. Damaged Glow Plug

Damaged glow plugs are also one of the major causes of blue smoke from cars, after starting up a diesel engine, you need to use a glow plug to cause ignition of diesel fuel. After the engine is warmed up, a glow plug is not necessary because the heat of the engine ignites diesel fuel.

If a diesel engine has a bad glow plug, then it will start to create blue smoke at startup until it has warmed up.

What Makes Blue Smoke From Exhaust When Accelerating?

1. Stuck PVC Valve

If you start seeing blue smoke coming out of the exhaust, then need to check your PCV Valve (Positive Crankcase Ventilation) Valve because it is designed to release the pressure (which builds up in the Oil Pan) into the Intake Manifold (where the engine gets its air for running). The intake Manifold also works with the Air Filter of your engine. So if the PCV Valve is bad, it will mix the oil with air and other gasses in the engine. The combustion of this mixture will cause blue smoke.

2. Blown Turbo

A blown turbo can also cause blue smoke in cars that have Turbos. Blue smoke will start to appear in a big cloud if the car blows a Turbo. A blown turbo is turbo-caused damage or a broken oil seal in the Turbo. Regardless of the case, the oil has gotten into the engine.

3. Worn Engine

Worn engines are also one of the popular countries of blue smoke from the exhaust.

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All engines come with pistons that are manufactured to move up and down a cylinder. All piston has metal rings around its side like bracelets. These rings are designed to help the piston from a tight seal against the cylinder. So if the rings or cylinder is worn out, oil from below the piston will link and mix with the Air and Gasoline which will be burned causing the blue smoke.

How To Fix Blue Smoke From Exhaust

It is very important to know how to fix blue smoke, immediately you will notice that it is coming out of exhaust because of some of the reasons or courses mentioned above.

The first method of fixing blue smoke from the exhaust is to find the causes, then fix it immediately so that you will be able to get rid of the blue smoke fast before it causes a severe problem to your vehicle engine.

1. Clean The Engine

It is very important to clean your engine regularly, if you have not checked your car engine, then you need to do so immediately if you notice blue smoke.

Make sure that oil reaches the combustion chamber and causes blue smoke, a direct result of clogged cylinder heads. If there’s any problem then you need to remove the valve cover and do the necessary cleaning to rid your engine of debris.

Regardless of the type of engine, the first thing that can cause blue smoke is surely the engine.

2. Fix Bad Glow Plug

It is important to fix a bad glow plug, in case your car has a glow plug, the recommended method is to replace it with a new one.

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3. Fix PCV Valve

Fixing PCV Valve is simple and cheap as well. To do this, you need to look for a tube that links to the Intake Manifold. Keep following the tube back until you see your PCV Valve. Then take out the old PCV Valve and replace it with a new one.

4. Fix Valve Seals

If you need to replace or repair your car valve seals, the process is not difficult. You can even do it at home by anyone that can work on engines comfortably.

You need to not drop the valve into the engine, make sure that the valve is up, some people often use compressed air put in via the Spark Plug Opening.

The process of changing the valve seals depends on whether the engine has an overhead cam or not. If yes, then you need to do more work because you have to remove it to access the Valve Stem.

You need to remove the spring from the Valve and the Rocker Arm before you lift the old Valve Stem Seal the Valve Stem and replace it with the new one.

5. Fix the Transmission Modulator

You also need to face the transformer moderator to get rid of blue engine smoke. You need to find its position before you remove it and replace it with a new one.