egr valve ... better to block it off??

sloopercat said:

The engines are designed with the EGR, it actually lowers combustion temps. If you just disconect it without changing fuel mixture you can burn the valves. It gains you nothing in performance, you only pollute the air more.

Take a look at:http://www.autoshop101.com/

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Autoshop101.com isn't going to tell you to violate federal law sloop. And while the EGR won't significantly reduce power output when it works right, it raises heck with our engines in the long term. Carbon deposits in the intake and combustion chambers are greatly increased over time when the EGR is in place and functioning properly. As oil consumption increases due to age and miles the situation is aggravated.

As for changing the mixtures,... The ECU does that constantly about 10 times per second. Don't worry about it.

Nox emissions are reduced with its use. It does this by reducing cylinder pressure under part throttle load,...
And since cylinder pressure is what drives the crank, it will affect part throttle power.

Think what you want. Do as you please, but it IS against the law .
Jamie

Yes, we can differ. Do as you like with your own car. I do think there are two schools of thought on the EGR. I strongly doubt that performance will be improved by it's removal. That's what my research tells me, you are definitely entitled to your own opinions on the matter.

Another article:

"What it does:

It reroutes burnt exhaust gases back to the intake air. The effect of the introduction of inert or incombustible gas increases gas mileage by displacing burnable oxygen/fuel withought effecting the air/fuel ratio. It decreases cylinder temperature (less boom, less heat), increases gas mileage (less oxygen, less fuel needed), and reduces the amount of NOx getting into the atmosphere."


If you are looking for performance upgrades, removal of the EGR has to be one of the least effective for time spent.

Junkie said:

It reroutes burnt exhaust gases back to the intake air. The effect of the introduction of inert or incombustible gas increases gas mileage by displacing burnable oxygen/fuel withought effecting the air/fuel ratio. It decreases cylinder temperature (less boom, less heat), increases gas mileage (less oxygen, less fuel needed), and reduces the amount of NOx getting into the atmosphere."


You just said it all right there-less fuel/air-better milage.

More fuel-more air = more horsepower,however minimal it may be.But,if it's enough to affect milage,it's probably a noticable difference in HP.

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to me this doesn't make sense...if you displace normal air with "inert gases" then u would HAVE to affect the a/f ratio, maybe the ecu won't know this but u will have to because there is less air and the same amount of fuel...

doesn't affect it a whole lot, i wouldn't assume, but its there and there's random other shit in the exhaust that you probably don't want going through ur engine....think of it this way:

you have the choice of running PURE (as pure as you can get from our atmonsphere) air through your system with no additives or extra "shite"...or you can run some pure air mixed with random nasty shit that won't burn and will just take up space, maybe burn off some things that are bad for the enviro but not create any extra power, of course you have to lose a little power because there is less o2 burning, meaning less combustion, meaning less power

might not be noticable in the seat-o-the-pants dyno, but its gonna be there

secondly, the heat generated from egr would be inherintly bad....any extra heating of the engine/head is going to be a bad thing....

just my opinion but it makes sense....

The EGR vavle is not a bad thing when it's working properly. It's like putting a brick in the toliet tank. So that less water comes in. Same thing with EGR vavles. They let recycled exhaust gas into the combustion camber. To where less air/fuel is let in. Thus making it burn less fuel and reducing combustion temps. Less fuel better fuel milage. Remember that it works off a vacuum switch. That does not let EGR gases in during idle or wide open throttle. So preformance is not effected when you need full power.
The problem is when it's not working right. Then performance suffers and so does gas mileage. In the good ole days. When our EGR's stopped work correctly. We just put a block off plate on them and said to hell with it. They cost too much to fix. Especially if the entire EGR system is plugged up with carbon build up. You'd have to tear the whole engine apart to clean all of the carbon build up out of the passeges.
If it's working ok then I'd leave it alone. If it's not then you pocket book will probly be your guide. On weather or not you want to fix it.
But don't sweat the EGR vavle. It's not a bad thing unless it's broke.