The main function of an (EGR) valve is to allow the exhaust gases to flow from the exhaust manifold into the intake manifold.

It does this job by either opening or closing as needed.

Also, The (EGR) system is responsible for reducing the combustion chamber temperatures in the cylinder. Consequently, Resulting in lower emissions as well as discharging fewer oxides of nitrogen into the atmosphere.

The (EGR) valve can malfunction by becoming stuck open or closed due to carbon buildup. When the valve malfunctions (CO2) is reintroduced to the combustion chamber at the incorrect time or in incorrect amounts. As a result, Not decreasing the combustion temperature sufficiently enough to prevent the increase of (NOx).

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EGR Valve – Exhaust Gas Recirculation Valve – What Should You Know

Exhaust Gas Recirculation (EGR) Valve – What You Need To Know

Signs of a Bad (EGR) Valve

Because of hot exhaust gasses such as carbon dioxide and (NOx), It has a good chance of getting damaged. This, in turn, reduces the car’s performance and increases pollution as well. When there is a problem with the valve, the check engine light may come on.

The two main issues (EGR) valves face are that, either the valve stays open or it shuts completely.

Here are some common symptoms you will notice if you have a bad (EGR) valve.

  • Poor/Rough Idling
  • Black Smoke from Exhaust
  • Check Engine Light Illuminates
  • Drop in Fuel Economy
  • Engine Stalling
  • Turbocharger can Fail
  • Engine Disintegrates

So, Bad valve symptoms vary and resemble problems in other engine systems. But now that you know the type of symptoms a troubled valve will produce, include it in your troubleshooting tests. And restrain yourself from swapping components trying to fix the problem before knowing which part is causing you trouble.

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