We have been taking a lot of phone calls here recently at MicksGarage from customers looking to order replacement EGR Valves for their vehicle. Two things are apparent from these calls:
A) EGR valves break a lot and
B) Some people do not seem to know what an EGR valve is or what its function is.
So…..EGR Valve = Exhaust Gas Recirculation 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 gases your EGR valve re-circulates also prevents the formation of Nitrogen related gases. These are referred to as NOX emissions, and are a common cause for failing emissions testing as part of the NCT. Unfortunately, EGR valves are known to get stuck open, causing NOX gases to build up.
You'll know if your E.G.R. valve is stuck or malfunctioning because your car will experience symptoms like rough idle and bucking on acceleration. An amber warning light should appear on your vehicles dash board to indicate a problem before there are any noticeable driving defects. If the light is left undiagnosed, your vehicle will start to perform badly and the vehicles fuel consumption will drop considerably.