EGR valve???

[bella]

What meen EGR and where is located...some pictures will be great.

My car is 1986 sedan, 4wd, carb Hitachi, EA82.

 

Thanks allot.

[Subarian]

EGR stands for Exhaust Gas Recirculation. It's located on the rear of the intake manifold (the crossover pipe) between the carburetor and the right cylinder head. It has a vacuum line going to it that controls it.

 

The concept of the EGR valve is this:

 

At high combustion temperatures, above 3000 degrees F (roughly 1650 C) the combustion of gasoline converts nitrogen and oxygen into oxides of nitrogen (NOx). NOx is a contributor to the formation of smog. In order to reduce the combustion temperatures, an inert gas (the exhaust gas) is introduced into the combustion chamber to lower the combustion temperature by retarding combustion. This occurs at higher engine speeds, hence the vacuum control. The EGR valve (if it's operating properly) will open at higher RPMs, allowing exhuast gases to mix with the incoming air/fuel charge.

 

An improperly operating EGR valve can cause rough idle, hesitation, low power and poor fuel mileage. There has been quite a debate on USMB lately as to whether blocking off the EGR is a good idea. Mine is blocked off and my engine runs well with it that way.

 

By the way, if you do a search you will find a long thread that is only a few days old that includes pictures of the EGR and tells how to block it off, if that's what you decide you want to do.

[exister99]

EGR valves on Subarus are pretty simple compared to the ones on newer cars. I took mine off when I had the carburetor out and was able to clean most of the carbon buildup off of it with small brush. Then I checked its operation by sucking on the tube and listening for the opening and closing of the valve. Pretty straightforward little part overall.

[GLCraig]

You know since an EGR valve is an emissions item, a Subaru sold in Hungray may not have one.

[bella]

You know since an EGR valve is an emissions item, a Subaru sold in Hungray may not have one.

 

I am from Romania not Hungary:brow:...but is posible...I'll ceck to see if My engine has one.

 

Thanks.

[bella]

EGR stands for Exhaust Gas Recirculation. It's located on the rear of the intake manifold (the crossover pipe) between the carburetor and the right cylinder head. It has a vacuum line going to it that controls it.

 

The concept of the EGR valve is this:

 

At high combustion temperatures, above 3000 degrees F (roughly 1650 C) the combustion of gasoline converts nitrogen and oxygen into oxides of nitrogen (NOx). NOx is a contributor to the formation of smog. In order to reduce the combustion temperatures, an inert gas (the exhaust gas) is introduced into the combustion chamber to lower the combustion temperature by retarding combustion. This occurs at higher engine speeds, hence the vacuum control. The EGR valve (if it's operating properly) will open at higher RPMs, allowing exhuast gases to mix with the incoming air/fuel charge.

 

An improperly operating EGR valve can cause rough idle, hesitation, low power and poor fuel mileage. There has been quite a debate on USMB lately as to whether blocking off the EGR is a good idea. Mine is blocked off and my engine runs well with it that way.

 

By the way, if you do a search you will find a long thread that is only a few days old that includes pictures of the EGR and tells how to block it off, if that's what you decide you want to do.

 

 

Thanks man...great details.