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Video:What Is an EGR Car Valve?

with Nick Jaynes

Want to learn about EGR car valves and what role they play? Here, see facts about EGR car valves.See Transcript

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Transcript:What Is an EGR Car Valve?

Hi I'm Nick Jaynes from DownForce Motoring for About.com and this what is an EGR valve. I'll be using information found on About.com's auto repair guide site.

Information About EGR Car Valves

If you've ever messed around with doing some back-yard-mechanics or ever listened to cartalk on NPR, you've probably come across an EGR valve. Though many people have heard of it, few know what exactly an EGR valve is.

What Is an EGR Car Valve?

The EGR valve, or Exhaust Gas Recirculation valve, is a vacuum controlled valve, which allows a specific amount of your exhaust back into the intake manifold. This exhaust mixes with the intake air and actually cools the combustion process. Cooler is always better inside your engine. The exhaust your EGR valve recalculates also prevents the formation of Nitrogen related gases in the emissions. These gasses are referred to as NOX emissions and are a common cause for failing emissions testing. Unfortunately, your EGR valve can get stuck, causing NOX gases to build up.

How to Know if Your EGR Car Valve Is Malfunctioning

You'll know if your EGR valve is stuck or malfunctioning because your car will experience symptoms such as rough idle and bucking on acceleration. Of course there are other potential causes for these issues but a stuck EGR is a quick explanation. When working properly EGR valves help engines run more efficiently and cleanly, limiting the environmental impact we each have on the environment. On the downside, however, when EGR valves go bad they can cost several hundred dollars in parts costs alone, not to mention diagnostic and labor costs.

Unfortunately there is no way to prolong the life of your EGR valve, ensuring it has a long usable life. If you experience any rough-running symptoms in your car like mentioned earlier, check to see if your car's EGR valve is working correctly first as they are prone to failure especially in some brands.

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