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- By using a throttle in the intake manifold, the pressure after the throttle drops, below the exhaust gas pressure, which also triggers the exhaust gases to flow into the intake manifold.
x-engineer.org/exhaust-gas-recirculation-egr-introduction/Exhaust Gas Recirculation (EGR) complete guide – introduction
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Exhaust gas recirculation (EGR) is the most common technology to reduce nitrogen oxides (NOx) emissions on diesel internal combustion engines (ICE). EGR takes exhaust gases from the exhaust manifold and reintroduces them into the intake manifold, mixing them with fresh air.
- What Is An EGR Valve? What Does It do?
- Bad EGR Valve Symptoms
- EGR Valve: Clean Or Replace?
- Types of EGR Valves
- In Summary
EGR stands for exhaust gas recirculation, and the EGR valve’s sole purpose is to recirculate a tiny proportion of the exhaust gas back into the combustion chamber. This will sound counterintuitive at first but dig deeper and you’ll see just how fascinating this part actually is. Here’s what happens (in a nutshell): the introduction of exhaust gasse...
There are several tell-tale signs of a faulty EGR valve. To complicate things further, many of these signs also indicate other problems, so it is important to think about all the possibilities before concluding it is the EGR valve. Below we’ve outlined some of the most common signs, what they look like, and how they might impact the drivability of ...
If you’ve concluded that you have a bad EGR valve, you have two choices: clean it, or replace it. The most likely reason your EGR valve is malfunctioning is because of carbon deposits, soot, and/or dirt buildup that leads to it being stuck closed or open. Simple cleaning usually resolves the problem. However, if the valve is damaged physically, it’...
Older cars typically use vacuum-operated EGR valves, while modern vehicles all use electronically operated ones. Different automakers implement the technology in different ways, but the main types of external EGR valves can be summarized as follows: 1. Vacuum operated:This type of EGR valve uses a vacuum solenoid to open and close. It may also incl...
Now that you know what the exhaust gas recirculation valve does, why it’s important, and what happens when it malfunctions, you’ll be able to diagnose this problem as soon as it arises. The idea is to periodically clean your EGR valve so that it doesn’t get to a point where it stops working. We suggest stocking up on EGR valve cleaners, however, ca...
Jun 10, 2023 · When fuel and air are burned in the combustion chamber, some of the exhaust gases pass through the EGR valve, which redistributes the gases back to the air intake manifold via a secured vacuum line. This helps to regulate the engine temperature, while also reducing environmentally harmful emissions that pass to the exhaust system.
Nov 11, 2020 · As part of the combustion process, air enters the combustion chamber through the intake manifold and mixes with the fuel. As it is compressed or ignited (depending on the system), the pressure forces the piston down to power the engine and exhaust gas comes out through the exhaust manifold.
In the majority of the operating points of the engine (speed and torque), there is enough pressure difference between exhaust (higher) and intake (lower), which allows the exhaust gases to flow into the intake manifold, when the EGR valve is open.
In order to have an exhaust gas flow into the intake manifold, the exhaust gas pressure must be higher than the intake air pressure. On a turbocharged diesel engine this can be achieved either by using the geometry of the turbine vanes (VGT) or by fitting a throttle on the intake manifold.
Sep 1, 2006 · If the vacuum reading is low, the base ignition timing may be retarded, one or more camshafts might be retarded, or the EGR valve might be sticking open. If the intake manifold vacuum is higher than normal, the base ignition timing or intake camshaft timing might be too far advanced.
