V6 Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.

Part identity help? Check valve off the back of the plenum

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Old 01-28-2007 | 05:52 PM
  #1  
bobdole369's Avatar
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From: South Florida (NW_Broward)
Car: 1989 Firebird
Engine: 2.8L V6 MPFI
Transmission: Beat to heck 700R4
Part identity help? Check valve off the back of the plenum

Hi all,

So I found my vacuum leak that was causing me trouble today. The check valve off the back of the plenum - splitting into the lines for cruise control and for climate control - fell apart in my hands.

Anybody have a part name for this?



Forgive my leet mspaint skillz - heres where it goes:



Do we have a name for this or will just "vacuum check valve" do?


You can see how it broke - both nipples just kinda disintegrated.

Any problem with running the car without the valve? I've removed cruise a while back, so I unhooked the cruise vac line, and plugged in the climate control stuff directly. I suppose I could just cap this line off and hope it doesn't rain so I'd need the defroster - won't be able to get to the yard till next weekend I'm afraid. I've got it patched with some misc stuff I have, but it isn't the greatest. I suppose it'll work well for a week like this - a test drive revealed no ill effects so far, and my original problem is fixed (bogging, stuttering, seems like my car has pussified 1000%, etc)

I'm in south florida so no need for heat either.

Last edited by bobdole369; 01-28-2007 at 05:57 PM.
Old 01-28-2007 | 07:31 PM
  #2  
daves12secV6's Avatar
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From: Sayreville NJ
its just called a check valve,just go upto the guy at the parts counter and tell him u need whatever size vac check valve.1/4 inch i belive is the size on the back of the plenum

btw if u unhook the line for the hvac controls they will get stuck on defrost is all
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