What is the EGR Valve?

The EGR valve is vital to your car’s emission control; it controls a small passageway between the intake and exhaust manifolds. The EGR valve, or Exhaust Gas Recirculation valve, is a vacuum controlled valve which allows a specific amount of your exhaust gas back into the intake manifold. When the valve opens, intake vacuum draws exhaust gases through the valve. Exhaust Gas Recirculation helps to keep huge amounts of unburned fuel from being released into the atmosphere. This unburned fuel is thought to be a huge contributor to greenhouse gas build-up. The EGR valve helps your car run more efficiently and completely burn fuel by recirculating a portion of your exhaust gases and running it through the combustion process again. That’s why an EGR system became mandatory on all new vehicles some time ago. When the EGR valve malfunctions, it must be replaced. Unlike some emission control devices that can malfunction without affecting the performance of the vehicle, a faulty EGR valve can really affect the engine’s performance, or even cause it to stop running altogether. This exhaust gas mixes with the intake air and actually cools the combustion process. Cooler is always better inside your engine. The exhaust gases that your EGR valve recirculates also prevents the formation of Nitrogen related gases. These 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. You’ll know if your EGR valve is stuck or malfunctioning because your car will experience symptoms like rough idle and bucking on acceleration. EGR valves do not normally require maintenance or replacement for preventative maintenance, but the valve can become clogged with carbon deposits that cause it to stick or prevent it from closing properly. Dirty EGR valves can sometimes be cleaned, but replacement is necessary if the valve is defective.

19 thoughts on “What is the EGR Valve?

  1. This design is wicked! You certainly know how to keep a reader entertained. With your wit I was almost moved to start my own blog (well, almost…HaHa!) Great job. I really loved what you had to say, and more than that, how you presented it. Too cool!

  2. Appreciating the commitment you put into your site and detailed information you offer. It’s great to come across a blog every once in a while that isn’t the same outdated rehashed material. Great read! I’ve bookmarked your site and I’m adding your RSS feeds to my Google account.

  3. Woah! I’m really digging this website. It’s simple, yet effective. A lot of times it’s challenging to get that “perfect balance” with understanding what is written. I must say you have done a superb job with this. Additionally the info is great. Exceptional Blog!

  4. Hiya, interesting blog, useful info & easy to understand. Not everyone has mechanical knowledge so it’s a breath of fresh air to actually read something and understand what you are reading. Keep up the good work!!

  5. Hi, thank’s for writing these blogs, they are so easy to understand and it just makes me aware of little and big issues that can go wrong with my car. I’m no mechanic so any information is good to have before my car needs to go in for repairs.

  6. Great reading, always relevant information about things you need to know about your car. Nice and easy to read and understand, who would know what an egr valve is, not me!!! Always good to read things in a language that is simple to understand.

  7. Hi, good writing, simple to understand and easy to read. Mechanical terminology can be difficult to understand and its great reading something in ‘black & white’!!

    1. Hi, thank you for your comment. Here at AE Services LTD we try to write information out as clearly as we can. From our experience with customers who use our garage we find that they respond better to clear easy to understand information and that is how we continue to have a great working relationship with all of our customers old and new.

  8. Good day I am so thrilled I found your weblog, I would just like to say kudos for a remarkable post and an all round exciting blog, Please do keep up the awesome work.

Leave a Reply

Your email address will not be published. Required fields are marked *