Can someone identify this part and its function?

[anothernord]

I was testing for boost leaks, and found that it was hissing air out of the tiny hole under the filter of the little round thing above the EGR solenoid. Can someone identify it? Also, would I be able to plug the hole and not mess something up? I'm assuming it was designed like that, but it doesn't make sense because it would just be a vacuum leak.

This thing:
https://sl-i.net/FORUM/images/imported/2010/01/IMG_36051-1.jpg

[tougemachine]

id say its the egr operating thingy...not sue what its called. but i think it operates the egr :neutral: it probably has a vacume line to the intake manifold somewhere

[tougemachine]

sorry, im sleepy :smt015

[ouch1011]

I'm not sure what Subaru calls it, but most manufacturers refer to that as the EGR backpressure transducer. Its basically what regulates the EGR valve position.

[tougemachine]

Yes. That's where I was goin. Had to deal with that on my Honda (wich I traided for the laptop I'm currently using)

[anothernord]

Ok, so I'm wondering why it can access air to the atmosphere. Wouldn't that create a vacuum leak?

[99gtlimited]

EGR related... no doubt

[grayguy]

just delete your EGR.

[anothernord]

just delete your EGR.

Won't that hurt gas mileage?

[decke48]

backpressure transducer. it basicly uses backpressure to detect load to control the egr valve

[anothernord]

backpressure transducer. it basicly uses backpressure to detect load to control the egr valve

So why does it need an atmospheric pressure reference to work? Also, I noticed that the hole that leaks had left some black gunk on the filter pad in there.

[99gtlimited]

just delete your EGR.

Won't that hurt gas mileage?

actually on the contrary, it would increase your mileage.... but it's also illegal in most states.

[decke48]

it need a air filter to vent some air from the diaphragm that controls the vacuum
https://sl-i.net/FORUM/images/imported/2010/02/192750_EGRBPT93_240SXFig24_1-1.jpg
https://sl-i.net/FORUM/images/imported/2010/02/192750_EGRBPT93_240SXFig25_1-1.jpg
off a 240sx basicly the same expect the subaru have 2 input vacuum and the egr solenoid is after the transducer
if you have a bit of carbon build up the diaphragm may have a leak

[anothernord]

Ahh, I see, the hole is there to allow the space behind the diaphram to breath in and out. However, it appears that that air should NOT be coming out of it. Does this mean that my transducer has a crack in the diaphragm that is allowing air to escape?

[decke48]

you need to determine if you have a vacuum leak or leak from the egr pressure side. if you have a mighty vac w/ pressure. pressurize the bottom port with 10psi make sure it holds. next part is a little trick you need to pressurize the diaphragm and apply vacuum to upper port. now plug of the side that has two ports and apply vacuum to the other vacuum port (hook a hose to the pressure side of the mighty vac and hook to the bottom port to pressurize the diagram and vacuum size to the mighty vac to the upper port) and see if it holds vacuum (should only hold vacuum with pressure to the diaphragm) if it doesnt hold vacuum or pressure the transducer is bad

[ouch1011]

Fairly sure it shouldn't be leaking. It is entirely possible that it has a leak because odds are it wasn't designed to be pressurized.