I have an 85 LG4 setup and hope someone can tell me where the vacuum line from the back of the egr control solenoid goes. The two lines on the front go to the egr valve and to intake vacumn on carb.

 

That's all that goes to it. The 3rd "fitting" is a vent, doesn't get a hose.

 

Thanks RB. Is there suppoxe to be a small filter there? Sure looks like something should go on it though, there is a metal keeperon it. Weren't you in Memphis at one time?

 

Yes there is.

Yes I was. I've been a couple of other places since then.

 

Thanks. I went ahead and got a new one. The little keeper on the back holds a small filter screen.

 

I don't have a little filter on mine either. Does that vent expell pressure, or does it release vacuum? I guess my question is how important is the filter? ... and if it is, where do I get one?

thanks for your time,
phil

 

Damn Phil, you're almost as old as I am. I dont think the little filter on the control silonoid is very important. GM couldn't have done it any cheaper. Here's picture of the new one.

 

I know this is going to sound stupid, but....

The filter expels vacuum.

Imagine what would happen if there were not some kind of a vent on that line going to the diaphragm.... the solenoid valve would open, send some vacuum to the diaphragm, which would do its thing; when the time came, the solenoid valve would close, but if there was a perfect seal, the diaphragm would remain operated.

So all that the vent does, is let the vacuum escape when the solenoid drops out. The filter is there to keep out the dirt that would come in with the replacement air.

You gotta be careful that too much doesn't escape though, since that could be quite dangerous. It's been conclusively proven that laboratory rats can survive for a few seconds at most in a vacuum-enhanced environment. Iamgine a whole city with too much vacuum in its air. And that stuff is nasty if it leaks too; it gets all over everything, and the only way to clean it up is with a special tool called a vacuum cleaner. Very messy.

 

wtf RB?

 

hahaha.....all that "vacuum air" will really screw up your lungs....luckily i can sell you normal air for a cheap price