what is this? Is it need?

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Feb 22, 2011 | 04:45 PM

yellowvette1

Thread Starter

Instructor

Joined: Feb 2011

Posts: 146

Likes: 1

what is this? Is it need?

I can't seem to find any info anywhere about this thing. Its coming of the rear of my intake manifold. It looks like its coming off of the rear vaccume port. Can I block this off? Is it need? The car is a 84 crossfire. What is it?

Feb 22, 2011 | 05:14 PM

Aardwolf

Race Director

Joined: Jun 2004

Posts: 13,958

Likes: 707

From: WI

Quote:

Originally Posted by yellowvette1

Looks like the vacuum for cabin air, it will change doors to blow air to different vents. If you don't care if the cabin air doors work then it's deletable.

Feb 22, 2011 | 06:12 PM

rodj

Le Mans Master

Joined: Aug 2000

Posts: 8,838

Likes: 31

From: Australia

Quote:

Originally Posted by yellowvette1

Can I block this off?

Yes
If you don't want to be able to change vent positions or have cruise control

Feb 22, 2011 | 07:58 PM

DavePlum

Drifting

Joined: Mar 2008

Posts: 1,715

Likes: 1

From: Tx

Quote:

Originally Posted by yellowvette1

That's a three way check valve. There should be 2 vacuum lines coming off it, supplies vacuum from the intake to a/c and cruise control.
Just put on on my 84 after learning it was MIA.

If your not using a/c or cruise control then yes, you can just block it off.

Last edited by DavePlum; Feb 22, 2011 at 08:00 PM. Reason: addtional info

Feb 22, 2011 | 08:47 PM

davenbocafl

Instructor

Joined: Mar 2005

Posts: 216

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its a check valve, you can bypass it and everything still work, just wont protect against blowback,

Feb 23, 2011 | 03:23 AM

86PACER

Le Mans Master

Joined: Jan 2003

Posts: 5,858

Likes: 7

From: Santa Maria CA

Does your '84 have cruise control? If it does removing it will kill the cruise.

Mine uses that same 3-way check valve in the same location for the Cruise Control and AC unit.

Feb 23, 2011 | 08:15 AM

rodj

Le Mans Master

Joined: Aug 2000

Posts: 8,838

Likes: 31

From: Australia

Quote:

Originally Posted by davenbocafl

just wont protect against blowback,

Nothing to do with BLOWBACK.

Is there to maintain vac in system ( through the vac ball under drv side headlight ) when engine vac changes
like WOT.
If not in place, vent position would change every time throttle position changed

Feb 23, 2011 | 09:55 AM

pmihaltian

Slingshot

Joined: Dec 2001

Posts: 3,817

Likes: 24

From: Charlotte NC

This vacuum system check valve can be purchased for just a few dollars at NAPA or any of the other parts houses. Just remove it and take it with you when you purchase the new part. This way you will be assured of getting the correct part.