Everything you need to know about Exhaust Gas Recirculation (EGR)
Exhaust Gas Recirculation (EGR) also known as "exhaust gas recycle" is a proven technique for reducing pollution emitted from on-road diesel engines.
Although it can have a wide range of applications for diesel-powered commercial vehicles, its basic purpose as an emissions reduction approach is to regulate the flow of exhaust gas and reduce nitrogen oxide (NOx) emissions on most types of trucks, RVs and SUVs.
As a recently implemented emissions control technology, the EGR system comes standard on all 2010+ vehicles that have the built-in Selective Catalytic Reduction (SCR) technology.
The EGR system is basically an important component on your vehicle that you might want to get to know if you're interested in keeping your truck running as efficienctly as possible. The following is a quick tutorial on everything you'll need to know to ensure yours is always in good working condition.
How exactly does EGR work?
In an EGR system, the EGR valves work to reduce the combustion temperature and lower the level of NOx emitted through the exhaust system.
When the EGR valve comes into operation, exhaust gases are diverted from the exhaust manifold to the inlet manifold via the EGR valve unit. This results in a lower combustion temperature and lower levels of NOx emissions.
What are the most common causes for malfunctions in the EGR system?
The most common cause for malfunctions in the EGR system are seized or carbonized EGR valves.
Soot particles, carbon deposits and oil are all contaminants which can cause the valve to stick and potentially prevent it from opening or closing. Damage to valves may also be caused by exposure to excessively high temperatures.
On pneumatic style valves, malfunctions may also be caused by faults in other vacuum system components such as vacuum pumps, vacuum lines and solenoid valves, therefore it's always a good idea to have these checked when you do your general maintenance.
How can I tell if I need a new EGR?
The signs will be obvious if you've got a faulty or defective EGR, which will result in poor emissions and could even cause the motor to shake. In extreme situations, you may notice a lack of power or stalling. Read 11 steps on how to check your EGR valve or check out the following DIY video on it here:
How do I clean an EGR valve?
Knowing how to clean an EGR valve can help you save money. The following video is a general explanation on how to clean any type of EGR valve:
How do I remove an EGR valve?
