What causes high exhaust temperatures in diesel engines?

Fouling of the turbine side of the turbocharger is a common cause for high exhaust gas temperatures. The sequence of events is often as follows: → Fouling of turbine (coke deposit) → Bad turbocharger performance → Lower airflow and charge air pressure → Higher exhaust gas temperatures.

What causes high EGT in diesel?

The richer the air/fuel ratio in a diesel, the higher the EGT will be. Two things can create a rich mixture under heavy loads or at full throttle: the first is too much fuel, and the second is not enough air.

What does high exhaust system temperature mean?

The High Exhaust System Temperature (HEST) Lamp illuminates to indicate that high exhaust temperatures may exist due to aftertreatment regeneration. When this lamp is illuminated, ensure that the exhaust pipe outlet is not directed at any surface or material that will melt, burn, or explode.

What is a safe EGT for Duramax?

If you’re already holding 1,200 degrees F and then hit any sort of grade, exhaust gas temperature (EGT) only increases from there—and 1,300 to 1,400 is the warmest you want a Duramax to see for any lengthy amount of time. Living above 1,300 degrees for much longer than 20-30 seconds sustained is asking for trouble.

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Can you regen while driving?

When everything is working as it should, regeneration occurs automatically while the vehicle is in motion, unnoticeable to the driver. Using the heat of the exhaust itself, soot is burned off the DPF often as quickly as it accumulates. This is known as passive regeneration.

What is the exhaust manifold temperature?

Manifolds and/or exhaust pipes on some vehicles can reach 1200 degrees F. It is rare to find temperatures this high in normal operation. The hottest locations tend to be those for which there is some constriction or impingement of exhaust gas.

What triggers DPF regeneration?

They came up with a system in which active regeneration is activated when the amount of soot gathered in the DPF reaches a certain level. … When the soot gathered reaches this amount, it triggers the process of post combustion fuel injection which increases the temperature of the exhaust.

What does the exhaust gas temperature do?

As its name suggests, the exhaust gas temperature sensor measures the temperature of the exhaust gas. This information is then relayed back to the engine control unit or ECU, where appropriate action is taken.

What are the major exhaust emissions from an engine?

Exhaust emissions consist mostly of carbon dioxide (CO2), carbon monoxide (CO), nitrogen oxides (NOx:NO and NO2), volatile organic compounds (VOC), particulate matter (PM), nitrous oxide (N2O), ammonia (NH3), persistent organic pollutants (POP) including polycyclic aromatic hydrocarbons (PAH), and metals.

Where do the exhaust gases reach?

Exhaust gas or flue gas is emitted as a result of the combustion of fuels such as natural gas, gasoline (petrol), diesel fuel, fuel oil, biodiesel blends, or coal. According to the type of engine, it is discharged into the atmosphere through an exhaust pipe, flue gas stack, or propelling nozzle.

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