How do you know you have a bad EGR valve that's either stuck open or stuck close and it's time to replace it? Welcome back to top five water repairs. How do you know it is time to change your EGR valve? There are two types of EGR number one is either going to be vacuum control or number two is going to be a net-triangle control If the EGR is vacuum control is going to use vacuum to bring exhaust gas to go straight into the intake manifold So basically a typical vacuum control EGR is going to contain our Dyer frams going to contain a plunger a spring and valves If the EGR is electronic is going to contain a solid noise on the EGR which is controlled by the computer So basically the computer is going to energize the solid noise to open up the EGR Again, I'm going to allow exhaust gas to flow straight into the intake at this point You're probably wondering what's the purpose of having an EGR? Well, basically EGR is very important to help reduce emission So basically the EGR helps reduce nitrogen oxide also known as NOGS of main contributor to smog pollution In addition the EGR helps to reduce engine combustion temperature It also helps improve engine efficiency and also it helps improve gas mileage as well When there's something wrong with the EGR Whether it's vacuum control or electronic control and when the EGR is either stuck open or stuck close Dyer is going to notice all sorts of symptoms The first sign that you know that there's something once the EGR number one is going to be the check engine light is going to turn on and you're going to get some sort of EGR codes If the EGR is stuck open, this is going to cause a lean mixture in the air and fuel mixture So if the EGR is stuck open is dry is going to notice rough idle dry my notice low idle May notice erratic idle dry is also going to notice possibly an engine misfire as well in the addition Dyer is going to notice stalling as well if the EGR valve is stuck close It's going to cause a much higher engine combustion temperature So when engine combustion temperature is a lot higher. This is going to cause pain Detonation and dry is going to hear knocking noise coming from the engine More over a dry made notice strong fuel smell as well So when there's something wrong with that EGR valve it is time for inspection For example one of the most common problems that causes EGR valve to fail is going to be carbon build up So basically just to fix the EGR all you have to do is just remove the EGR valve and all you need is carbon cleaner Authority cleaner and just clean the EGR passages if you clean out the EGR passages This may actually fix the issue While you're expecting the EGR valve measure to check the vacuum hoses as well Make sure check connection as well. I hope you found this video useful as always Thank you for watching and subscribe to top five water repairs