An EGR (Exhaust Gas Recirculation) valve is very important for the exhaust system in a vehicle. The valve has been in use since the 1960’s in the US as it helps in increasing efficiency of vehicles and reducing pollution as well. However, whenever the EGR valve is clogged or not working as it should, engine performance can go down. So any time you experience rough idling or valve knock, you should have the valve inspected.  

What Is the EGR Valve?

Simply put, the EGR is meant to reduce emissions from the car. It reroutes some of the exhaust gases which are emitted by the engine into the combustion chambers. This effectively reduces temperatures in the combustion chambers. 

The EGR valve is an important component in the exhaust gas recirculation process as it helps to prevent exhaust valves from overheating, which can accelerate their wear and tear. The EGR valve therefore helps maintain the exhaust system at full capacity and increases the longevity of the internal combustion process. 

Symptoms of a Faulty EGR Valve

Issues with the EGR often lead to reduced performance and increased fuel consumption as it affects how the engine works. It is, therefore, important for you to know when to replace it. Some of the EGR valve symptoms you should look out for include the following.

An EGR valve that is stuck open

When the EGR is stuck open, it will lead to a vacuum leak which in turn causes inefficient combustion, hesitation, rough idling and even stalling. The reason for this is that the car cannot combust on the carbon dioxide emitted from the tailpipe. An open EGR valve causes exhaust emissions to flood the combustion chamber, hence preventing it from functioning as it should. To check for a stuck open EGR valve, idle a parked car with the brake on and have someone examine the plunger shaft to see if it is stick open. 

An EGR valve that is stuck closed

This causes nitrogen oxide emissions to rise and the car might start to knock. A sharp knock occurs when the fuel in the combustion chamber ignites before the explosion in the cylinder reaches it. This leads to a disruption in engine timing. When this happens, warm up your engine and rev it, then check if the EGR valve will move. 

How to Clean Your EGR Valve

If your car is running poorly, it might be a sign that your EGR valve has a problem. While there is no conclusive way of testing EGR function at home, you can always remove and shake it. If you can hear movement, then your EGR is okay and only needs cleaning. However, if you do not hear any movement, there might be a chance that the EGR valve is stuck. You should always seek the opinion of a professional since it is impossible to say for sure if the valve is damaged. Here’s how to go about EGR valve cleaning that you can do it by yourself.

  1. Remove the vacuum line connected to the EGR valve. Should it be damaged, brittle, frayed or broken, replace it.

  2. If the EGR valve has an electrical connection, disconnect the harness carefully.

  3. Unbolt the EGR valve from the engine. Give it a slight tap if it doesn't come right off. You can use a tiny hammer or a block of wood to do this.  

  4. Remove your gasket if it is frayed, torn or disintegrated. You can reuse it if it’s in good condition. 

  5. Soak your EGR valve in a bowl of carb cleaner. Avoid submerging the electrical portion if it has one. You should soak it overnight if possible. 

  6. After soaking the valve in the cleaner, you should clean the openings, passages and surfaces by using a small brush. You can also use a toothbrush or a pipe cleaner for this. Make sure to have eye protection and chemical resistant gloves because the carb cleaner is harsh. 

  7. The final step is to reinstall the EGR valve. Remember to reattach the vacuum hose and electrical connections if you had any. 


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  • big willie Nov.23 21:51
    Egr blanking plate. Problem solved
  • MollyAug.6 14:14
    What does the egr valve have to do w/ overheating? My car is spraying water out from around the valve & therefore making my car overheat I have a 1990 acura intregra rs
  • Dave LeeJul.19 19:16
    Why don't most of you people learn how to speak, and type!!
  • TammyJul.13 07:33
    How u know its your egr valve. Some guys told me its my cams .... My car is acting like ut running out of gas and keeps stalling out. And the oil light came on i out oil in it and its still acting funny
  • Tanisha Jul.7 23:38
    My 2001 Chrysler Sebring is giving off a bad egr read yet, I have replaced the valve and flushed it. I have even replaced the vacuum sylinoid. It's still reading bad. Can anyone help me?
  • Likes to WrenchJun.27 08:00
    Dawn dishsoap , hot water and lil brass brush is all thats needed to clean a egr valve! Safe for rubber and( electrical. I do all the time no failed ones yet)parts that are integral to the egr's performance so soak overnight or for 1/2. For hot hot water 1hr for hot water overnight night for cold water ohh bout a 1/2. Sec squirt of dawn dish soap n just enuff water to cover part! Hot water dawn. Dishsoap and.1/2. Soak or sprayed on engine to rearend cleans better than most chemicals without the battle gear of gloves n goggles. If it gets in your eye wash it out with water! Good for your car the environment.
  • EricMay.26 16:58
    Best thing that you could use to soak your erg is SIMPLE GREEN or other degreasers they won't eat your rubber components hope this helps good luck to all
  • JonahMar.2 03:47
    I have a Toyota Corolla 2C engine. After doing a top overhaul I can't start it. So I think it's the EGR valve because the engine has a installed EGR.
  • David Feb.10 21:10
    I have a 2005 dodge ram 1500. My truck had the symptoms of a bad EGR. THE Shop said the back 2 cylinders had no compression and could not tell the cause. Could a bad EGR be the reason?
  • Steve ReynaFeb.10 20:35
    My friend just recently replaced her EGR valve on her 1996 Ford Explorer and now it doesn't want to start. Any reasons why it won't start??? All info is greatly appreciated. TIA.
  • ajayOct.25 14:32
    @ : still you have the concern or get rectified.
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