benefits of blocked egr?

**99prixgt** · 04-11-2009

Is it just for emissions? If i block it off, would i get all that carbon build-up in my t/b, s/c, and lim? what's the good and bad when removing it? I was thinking of blocking it off while keeping it in tact for emission's check.

**osirus** · 04-11-2009

None. It ****s with the emissions system in your car. the ecm would wanna lean out on the fuel because it thinks there's unspent fuel coming from the egr valve. when it runs like that, it's going to get hot and pistons will pay for it.not a good way to go.. at least that's my opinion on it.

**Sabrewings** · 04-11-2009

Originally Posted by osirus

None. It ****s with the emissions system in your car. the ecm would wanna lean out on the fuel because it thinks there's unspent fuel coming from the egr valve. when it runs like that, it's going to get hot and pistons will pay for it.not a good way to go.. at least that's my opinion on it.

The PCM has a way of knowing if the EGR is blocked. Also, when the EGR is running it doesn't lean it out. It uses less fuel because it uses less air (since exhaust gas is taking the place of intake air, and it's inert). It still maintains a 14.7:1 ratio of fuel to fresh air. Exhaust gas is inert so it doesn't count in the ratio. It will also boost spark advance when the EGR is properly functioning.

Don't worry about blocking your EGR. The car will run fine without it. I've had mine disabled via the PCM (stays shut) and I still got 33MPG on my six hour trip a couple weeks ago. I now have mine blocked with two blocking plates and completely removed. Couldn't be happier.

It won't completely stop carbon buildup (only way to do that is not allow any air into the engine). But it will certainly make it buildup nowhere near as fast since exhaust soot isn't coming in.

**ASCStinger** · 04-11-2009

I think it would be more beneficial in an intercooled setup, as the EGR just recycles exhuast into the intake in order to dilute the air/fuel mix and thus keep the burn cooler.

the cooler air from an intercooled setup would keep cylinder ignition temps down and then you'd have the added benefits of a cleaner burn/intake if you blocked the egr off.

although I am just learning all about this myself so I could be mistaken

**osirus** · 04-11-2009

I myself am just getting into these newer cars so my opinions and ideas may be based on older conclusions. it would be just my opinion that since the ecm would want to keep an optimal a/f ratio it would factor in the egr's figures and calculate thusly. without that unspent fuel in the mix, it would run lean no matter what the o2 sensor adjusted for because it would always be basing its calculations on an incomplete set of references. as I said though, I base this on some older stuff.

**FoSHO99** · 04-11-2009

Almost everyone deletes their egr when they have a chance especially if they do not have to worry about emission laws. The only thing it will do is throw a code which can be deleted with a tuner. Im almost 100% sure it does nothing with the a/f ratio or make you run lean if you have it deleted.

**osirus** · 04-11-2009

wouldn't the computer send a signal to the solenoid to open up the valve though? and wouldn't the o2 sensor be telling the computer that x amount of unburnt gasses are in the exhaust leading the exhaust gas recirculation valve to open letting those gasses get mixed into the intake? wouldn't the ecm adjust the a/f for those gasses from the egr? as i said though, i base this on slightly older cars than most folk here.