2G Boost Leak from EGR valve

[gijoe985]

So, I have all of the vacuum ports on the throttle body blocked off, but had the hoses still there. I noticed boost pressure coming from a hose. Turns out there was boost pressure leaking out of the egr valve actuator. Now, if I plug that with my finger, it obviously opens the egr because all my boost pressure drops and I can hear it exit the exhaust. So, I assume this means that I must block off my egr? If I leave it unplugged, boost comes out the nipple. If I plug it, the egr opens and boost goes out the exhaust.

Is this normal operation? I assumed that it should be receiving a vacuum signal from that port, not sending boost out of it? Maybe one of you have ran into this before...

 

[streetraceboi]

Get an EGR block off plate and be done with it

 

[gijoe985]

Get an EGR block off plate and be done with it

Yes, that would work, though I was still curious about the proper function of the egr valve. Should boost pressure come out of one of the nipples? I'm kinda reaching back there blind, so I cannot tell if it is the upper or lower port. But most definitely when you pressurize the system, pressure comes out, and if you block it, it opens the EGR.

 

[dustyboner]

as far as i know there is a diaphram separating the upper and lower vacuum ports.

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[gijoe985]

Yeah, so when I pressurize the system, either the red or blue port is pushing out air. When I plug it, the EGR opens. And neither are hooded up to anything, so the air must be coming from the intake and leaking out the egr.

 

[gijoe985]

Looking at the picture more closely, it's probably leaking past the pintle and then leaking out the blue port. When I plug the port, it pressurizes the diaphram and then opens the pintle. Makes sense now.