10 Causes of Black Smoke on Common Rail Diesel Trucks

10 Causes of Black Smoke on Common Rail Diesel Trucks – Pajero sports car is a Mitsubishi production that is quite popular today. The toughness of the engine in this car is quite well known, especially with the presence of a machine with DID common rail injection technology. Common rail injection technology provides better results than conventional diesel engine technology, both in terms of engine power and the residual exhaust gas output of the vehicle.

10 Causes of Black Smoke on Common Rail Diesel Trucks

Even though it is a diesel engine, the smoke that comes out of the Pajero Sport engine looks cleaner, not too puffy. Well, if there is a Pajero Sport that emits black smoke in the exhaust, this indicates that there is a problem with the engine.

Causes of Black Smoke on Common Rail
Common rail diesel on the black smoke problem.

So what are the causes of black smoke coming out of the exhaust in this Pajero Sport car? In the following article, we will share information on 10 possible causes of black smoke coming out of the exhaust in a Pajero Sport car. Here are 10 causes of black smoke coming out of the exhaust in the Pajero Sport car.

1. Using Inappropriate Fuel

The cause of the exhaust black smoke in the first Pajero sports diesel car was the result of using inappropriate fuel. As we know that the diesel engine in this car uses a common rail system which is quite complicated and complex.

Read more: Correct Cetane Number for Common Rail Diesel Engines

The common rail system is very susceptible to the use of low-quality fuel, especially in the fuel system. Using inappropriate fuel, such as using low-quality diesel fuel, will make the exhaust gas in this engine dirtier and more soot.

As a result, the exhaust will emit thick black smoke along with the reduced engine power of this car.

2. Incorrect Engine Oil Volume and or Viscosity

Causes of Black Smoke on Common Rail
Engine Diesel Oil.

The cause of the exhaust coming out of black smoke in the second Pajero sports diesel car is the result of the wrong volume or viscosity of the engine oil. This car uses engine oil with API service grade minimum “CD” or higher, even the manufacturer has applied this car engine oil to grade CF-4 with SAE 10W-30.

Read more: How to Choose the Right Diesel Engine Oil

When using a different grade of oil, will affect the overall engine performance. And so with the exhaust gases that come out of the exhaust. Acceleration and engine power become heavier, causing black smoke to come out of the exhaust.

3. Injector Has Problem – 10 Causes of Black Smoke on Common Rail Diesel Trucks

The cause of the exhaust coming out of black smoke in the third Pajero sports diesel car is the result of a problematic injector such as a clogged, dirty, or damaged injector. Injectors in diesel engines play an important role in creating better fuel atomization.

Read more: Symptoms of Injector Damage on Common Rail Diesel

Especially in the common rail system, this Pajero car uses a Direct Injection system that requires an injector with perfect working accuracy.

Failure to work on one or more of the injectors can cause the engine to limp and vibrate violently and the engine to run out of power. In addition, the exhaust gas the engine produces is also imperfect so it causes black smoke to come out of the exhaust.

4. Faulty Fuel Pressure Sensor

Causes of Black Smoke on Common Rail
Fuel rail pressure sensor. Image source: Youtube

The cause of the exhaust coming out of black smoke in the fourth Pajero sports diesel car is the result of a faulty fuel pressure sensor. The fuel pressure sensor is a source of fuel pressure data in the common rail pipe for the engine control unit (ECU).

Read more: Symptoms of Common Rail Fuel Pressure Sensor Malfunction

When the fuel pressure sensor is damaged, the engine ECU no longer gets accurate data about how much pressure is in the common rail pipe.

This condition will affect the amount of fuel that the injector must inject into the combustion chamber. So that it can cause the exhaust to emit black smoke due to too much fuel.

5. Faulty Fuel Pressure Limiter Valve

The cause of the black smoke coming out of the Pajero sports diesel car is the result of a faulty fuel pressure limiter valve. This fuel pressure valve limiter functions to maintain fuel pressure in the common rail pipe. Its working principle is similar to that of a fuel pressure regulator, but with a higher pressure.

Read more: Symptoms of Fuel Pressure Limiter Valve Malfunction

When the fuel pressure limiter valve is damaged, the ideal pressure required for the fuel injection to reach the target is no longer achieved, it can be more or less. As a result, there was a mess in the settings of the injection system which resulted in the exhaust coming out of black smoke.

6. Supply Pump Problems – 10 Causes of Black Smoke on Common Rail Diesel Trucks

The cause of black smoke coming out of the exhaust in the sixth Pajero sports diesel was a problem with the supply pump. This supply pump is an injection pump to produce high fuel pressure to the common rail pipe.

Read more: 4 Faulty SCV Signs on Common Rail Systems

When the supply pump has a problem (such as a broken Suction Control Valve) then the fuel supply will also be disrupted due to a decrease in fuel pressure. As a result, the injectors cannot inject the ideal amount of fuel and cause the exhaust to emit black smoke in the Pajero sports car.

7. EGR System Problem

Causes of Black Smoke on Common Rail
EGR Pajero Sport.

The cause of the exhaust black smoke coming out of the seventh Pajero sports diesel is a problematic Exhaust Gas Recirculating (EGR) system. EGR controls the remaining exhaust gases to be returned to the combustion chamber to reduce pollution levels in the exhaust gases.

Read more: Symptoms of EGR System Malfunction

When there is a problem with the EGR, the amount of exhaust gas that goes back into the combustion chamber can no longer be controlled. This will increase the amount of blow-by gas in the engine so that the pressure increases.

The blow-by gas pressure containing oil vapor will be forced out through the intake channel to the turbocharger, then to the intercooler, intake manifold, and back into the combustion chamber.

The oil vapor that entered earlier, will affect the results of the next exhaust gas so that it can cause black smoke in the exhaust.

8. Engine Control Unit (ECU) Faulty

Causes of Black Smoke on Common Rail
ECU Pajero Sports -10 Causes of Black Smoke on Common Rail Diesel Trucks.

The cause of the black smoke coming out of the exhaust in the eighth Pajero sports diesel was the engine ECU being damaged. The ECU plays a role as a determinant of how much fuel the injector must inject into the combustion chamber based on actual conditions when the engine is working.

Read more: 5 Causes of a Damaged ECM or ECU, Anything?

When the engine ECU is damaged, the ECU can no longer control and determine the amount of fuel that the injectors need to inject. In addition to black smoke coming out of the exhaust, a faulty ECU can also cause the engine to crash.

9. Turbocharger Faulty – 10 Causes of Black Smoke on Common Rail Diesel Trucks

The cause of the exhaust black smoke in the ninth Pajero sports diesel car is a faulty turbocharger. The damage to the turbocharger that causes black smoke to come out of the exhaust is when the oil seal in the turbocharger is broken. This condition causes the oil that flows into and is sucked into the combustion chamber.

Read more: Symptoms of Turbocharger Malfunction

10. Low Compression Pressure

The cause of the black smoke coming out of the Pajero sports diesel car that I last saw was the result of a decrease in the compression pressure in the combustion chamber. Low compression pressure will affect combustion results, causing a lot of fuel that is not completely burned and turns into soot in the exhaust gases which will cause the exhaust to emit black smoke.

Read more: Symptoms of Weak Diesel Engine Compression Pressure

To overcome the problem of the Pajero sports car coming out of black smoke, of course, a careful examination is needed, including using a scanner that is generally only owned by authorized dealers.

Thus the article 10 Causes of Black Smoke on Common Rail Diesel Trucks can convey, hopefully, that it can be useful.

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