Thread: EGR Delete

So I read up on ZZP about the EGR delete...

"The proper way to install the plates so you should not get an SES light is to install the exhaust plate on the manifold, leave the EGR plugged in, ((My Question Is Here))--> but leave the exhaust side of the valve open to the atmosphere."

((Confused.. Which one to leave open to atmosphere?)) 1 or 2? In pic below.

"Using this method will keep the PCM happy and you WILL NOT SET AN SES LIGHT or throw any codes! If you want to remove the EGR valve completely, you will also need the intake plate, however you will get an SES light, so you will need PCM programming.

With the EGR now drawing in fresh air your intake will stay cleaner and cooler. *Gas mileage will suffer about 1 MPG with this mod."

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Even if leaving one open doesn't set any codes, it'll still mess things up fuel ratio wise. The point of egr is to recycle unburnt fumes in the exhaust and raise intake temperatures to reduce kr (also chemical components of exhaust gas reduces kr slightly). So now the computer will be adjusting the fuel ratio for the expected exhaust gas and getting fresh air instead. Now, it won't cause a terrible difference since exhaust gas is mostly air, but the worst problem is that the air it's pulling in is not filtered!!!

While setting the code isn't the best case, it tells the computer to adjust the fuel ratio as if the egr is defective, so it would be better to do that and deal with the code rather than inject the wrong dirty air to mask it f that makes sense.

I know its a common misconception, I'll update now about it. The purpose of the EGR isn't to reclaim unburnt gas. Its purpose is to fill and cool the cylinder with inert gas to lower the temperature of the combustion process and reduce NoX emissions.