Here is the real deal with EGR valve, they only work like they are supposed to when they are new, once they gunk up your engine it completely negates any gains it would have made by being in place.

Why you ask because of the carbon and soot build up increases the exhaust gas temps inside the engine increasing the NOX.

Any that can look at you with a strait face and say this is helping reduce emissions is only going by the theory of how the system works and not what it actually does to the inside of the engine. Unless you do a full intake manifold and intake tract cleaning including the EGR valve. The only thing that can help you is adding a oil catch can. With low quality fuel and low quality fuel and oil filters it makes the clogging and reduced function of these happen.
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Does anyone actually think this is reducing emissions?????[/SIZE]. If you never cleaned your intake on a diesel or turbo diesel yours loos like this.


So if your not going to pony up the money for the full intake tracked cleaning your better off deleting the EGR because it is actually making the engine run dirtier making pollution worse. So either maintain it or loose it is how I see the EGR. Most of these will be blocked already via the build up of harden soot and carbon and oil so they are not working to begin with. They really need to be cleaned completely yearly. If you have a 10 year old diesel engine and you have never had it cleaned, you can bet it's not even opening or is completely blocked off already.

To many base stuff on theory vs real world facts. And what I stated is the facts.