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Unread 08-31-2011, 09:32 AM   #1
pfohljerry
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1989 YJ Wrangler 
 
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Items on firewall, Unknown what they are

I can't figure out how to attach photos from my hard drive (I'm on a Mac). so I'll do my best to explain. This is an 89 yj with a 4.2 (m).
On the firewall, passanger side there are 2 white plastic items that has a place for a vacuume line (mine only has 1 line attached. it goes over to a tree just above the valve cover).
attached to that tree is 3 items joined together by vacuume lines and each has an electronic connection.
Can you tell me what these are and there purpose.

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Last edited by pfohljerry; 08-31-2011 at 10:10 AM.. Reason: added photo *I think)
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Unread 08-31-2011, 09:43 AM   #2
dancytron
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Sounds like the vacuum sensors from your description, ( http://home.sprynet.com/~dale02/vacuum.htm ) but hard to tell without a picture. Look at the link for answer.

http://home.sprynet.com/~dale02/list.htm
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Unread 08-31-2011, 09:51 AM   #3
timatoe
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The answer to the vac question is above, see the sprynet links.

As for pics, do this.....

http://www.jeepforum.com/forum/f29/h...pforum-574312/
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Unread 08-31-2011, 10:11 AM   #4
pfohljerry
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Thanks for the info on the photo. lease check it out. I think we are on the same page....What is it's purpose?
My green side has no vaccume line attached...Should and if so where is it attached
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Last edited by pfohljerry; 08-31-2011 at 10:20 AM.. Reason: Added photo and question
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Unread 08-31-2011, 10:17 AM   #5
dancytron
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They sense vacuum and feed that information to the computer. The link explains it.
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Unread 08-31-2011, 12:54 PM   #6
pfohljerry
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Thank you....
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Unread 08-31-2011, 01:31 PM   #7
pfohljerry
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Where does the green 4" vacuume line hook to? As you can see mine is not hooked to anything.
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Unread 08-31-2011, 01:50 PM   #8
Old4X
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Quote:
Originally Posted by pfohljerry View Post
Where does the green 4" vacuume line hook to? As you can see mine is not hooked to anything.
Both vac switches hook to manifold vacuum. You can run one line and a "T" and hook them both to it.

The other 3 switches are for the pulse-air system.
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Unread 08-31-2011, 03:43 PM   #9
mcmud
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Quote:
Originally Posted by pfohljerry View Post
Where does the green 4" vacuume line hook to? As you can see mine is not hooked to anything.
It appears to me that neither of them are connected to a vacuum source.

With the YJ, the 4" switch connects to the 'E' ported nipple (left front on the BBD) and the 10" (green top) switch to manifold vacuum.

You may notice that with the CJ layout (on the sprynet site) the 'S' ported nipple is used instead...stick with the 'E'.


This may help to sort out any other tube routing.
90yj42l-vacuum-jf.jpg  
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Unread 08-31-2011, 08:56 PM   #10
timatoe
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It's quite possible that the ECU is no longer used, as in the Nutter Bypass may have been done previously, which case those do nothing.
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Unread 08-31-2011, 09:42 PM   #11
Old4X
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Quote:
Originally Posted by mcmud View Post
It appears to me that neither of them are connected to a vacuum source.

With the YJ, the 4" switch connects to the 'E' ported nipple (left front on the BBD) and the 10" (green top) switch to manifold vacuum.

You may notice that with the CJ layout (on the sprynet site) the 'S' ported nipple is used instead...stick with the 'E'.


This may help to sort out any other tube routing.
Every time I look at that diagram I get cross-eyed. You are right, as usual.
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