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Old 07-06-2002, 08:50 PM   #1
Scooby Specialist
Member#: 7624
Join Date: Jun 2001
Location: Hopefully on a nice single track.
BD5; family sedan
that just wooped your ass

Question Who's the smartest one of all? What is this?!

I don't know what it is but I think it is time for a new one.

Anyone know?
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Old 07-06-2002, 10:38 PM   #2
Scooby Specialist
Member#: 2491
Join Date: Sep 2000
Chapter/Region: South East
Location: Charlotte, NC
06 Miata
81 Fiat Spider


Well, I've wondered that myself many times. I also thought that I needed to replace it because the felt arround it was all shot. I don't think this is the case. The part looks like a check valve, but it's not. I think it's primary function may be to stabalize the vaccume in that line which leads to the "Pressure Sensor" this is the part mounted on the passenger strut tower. The funny thing about the pressure sensor, at least according to my Haynes manual, is that my car, as well as yours (looking at your profile "5spd") does not need a pressure sensor. Well, surely it needs it if they put it on there? Well here's what the Haynes manual has to say about the pressure sensor:

"The pressure sensor monitors the intake manifold pressure changes in engine load and speed and converts the information into a voltage output. The pressure sensor is used on turbocharged and 1995 and later automatic transaxle models only..."

hmmm... So why does my 5spd have one? It's not turbo (yet, hehe..) and it's not automatic. My thoughts are, the computer still uses it to help calculate load and adjust fuel and timing accordingly. Maybe it's not conventional to use that sensor on a 5spd, non-turbo car and the Haynes writers wrote that little blurb, not knowing any better, since their car was almost certainly an automatic outback. Just my guess. :shrug: I may have to look into this some more in the factory service manuals.

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Old 07-07-2002, 01:13 AM   #3
Scooby Specialist
Member#: 17252
Join Date: Apr 2002
Chapter/Region: Tri-State
Location: NJ
'06 WX8


The vacuum diagram in the notoriously inaccurate Chilton's identifies this part as "filter". I thought it's there to protect the sensor and/or the pressure exchange solenoid from the dirt out of the PCV system. The foam is probably just to keep the plastic from rubbing against the adjacent hoses.
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Old 07-07-2002, 01:29 AM   #4
Scooby Newbie
Member#: 17172
Join Date: Apr 2002
Location: San Dawg, SoCal
2002 Impreza OBS
Silver w/ Blue Vinyl


Its a Gremmlin.....

-god I hate Mac's and their 3" wide keyboards-
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Old 07-07-2002, 09:37 AM   #5
Scooby Specialist
Member#: 7624
Join Date: Jun 2001
Location: Hopefully on a nice single track.
BD5; family sedan
that just wooped your ass


Thanks guys. It looks like crap, I think I will have to fix that.
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