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EMERGENCY! I pulled a vacuum line while changing cap and cannot find??

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Old Feb 18, 2008 | 07:40 PM
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EMERGENCY! I pulled a vacuum line while changing cap and cannot find??

In a '93 if you're on the passenger floor board it is right behind the distributor cap, with open end pointing right at you.

I have looked everywhere, (almost obviously)

idles very rough with it open

will eventually kill if plugged

I feel like an idiot, but I can find it, nor can I figure out the source to trace it back.

Help! (cuz it be freezing out there)

Dan
 
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Old Feb 18, 2008 | 08:08 PM
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From: Mitchell, SD
I believe there is a 'T' hidding up there that that line goes too. Try crawling in from the driver's side and shine a flashlight up the doghouse and see if you can see it.


If not, then try following the firewall from the engine bay around the HVAC system.
 
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Old Feb 18, 2008 | 08:51 PM
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Nothing,

Is it possible that I knocked a cap off??

if the front of the car is 12:00 (as you are inside) this particular stem points out at about 4:00, and is part of the tree (Or at least that's what I think you would call it)

I can find nothing as far as hoses or tee's that this would got to.
 
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Old Feb 18, 2008 | 09:44 PM
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Sounds like the vacuum tree that has a hose coming from the vacuum modulator on the passenger side of the transmission.
 
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Old Feb 18, 2008 | 09:46 PM
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ok (keeping in mind that it's 4° here) I plugged it, (the vacuum port) started the van, it idled for about 35 seconds, then went through a series or errrrrrr .... wumf about 10 times and then went back to idling fine.

Not sure what that means, but I'll drive it in the morning to see what happens.

In the FWIW category, I did pull off the Idle air control valve and sprayed it down with carb cleaner, it was pretty carboned up.
 
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Old Feb 18, 2008 | 09:49 PM
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Originally Posted by lv2race
Sounds like the vacuum tree that has a hose coming from the vacuum modulator on the passenger side of the transmission.
pretty sure I traced that one. Is it kind small like 1/2 the size of a campbels's soup can? if so that one is hooked in. (pretty much straight in front of the passenger seat, about belt high to whomever is sitting there)

Oh wait, I just reread your post, how far down on the transmission housing should I be looking?
 
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Old Feb 18, 2008 | 09:49 PM
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Anytime you have that bad of a vacuum leak. the idle will be terrible. Good thing you didn't try to drive it, then you really would have panicked because the van wouldn't have went into gear!
 
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Old Feb 18, 2008 | 09:54 PM
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From: The OC
Check the link below. This is the modulator, a vacuum line comes off this and up the trans/bell housing to the vacuum tree by the distributor. Is this what you already checked?

http://www.partsamerica.com/ProductD...e=1159&PTSet=A
 
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Old Feb 18, 2008 | 09:55 PM
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Originally Posted by lv2race
Anytime you have that bad of a vacuum leak. the idle will be terrible. Good thing you didn't try to drive it, then you really would have panicked because the van wouldn't have went into gear!
But when I first put in the new cap and rotor I did drive it around the block and it did go into gear. it was only when I pulled back into the garage that I it really start going through the errrr.... wumf sequence.
 
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Old Feb 18, 2008 | 09:55 PM
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From: The OC
Check this link for location of the modulator on the trans.

http://www.transmissioncenter.org/a4ld.htm
 
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Old Feb 18, 2008 | 09:58 PM
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So you drove it and then noticed a missing line?
 
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Old Feb 18, 2008 | 09:59 PM
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Originally Posted by lv2race
Check the link below. This is the modulator, a vacuum line comes off this and up the trans/bell housing to the vacuum tree by the distributor. Is this what you already checked?

http://www.partsamerica.com/ProductDetail.aspx?MfrCode=FRA&MfrPartNumber=FM233 6&PartType=1159&PTSet=A
That wasn't what I was talking about orginally, but I'm pretty sure the above is hooked also. seems like it was about a foot down from the distributor and about 6" toward the passenger side. But I'm not 100% sure.
 
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Old Feb 18, 2008 | 10:02 PM
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Originally Posted by lv2race
So you drove it and then noticed a missing line?
yes....

I never notice the line at all (or open port) until it start idling so badly, that I pulled everything back apart, and that's when I saw, what looked like a vacuum line was missing.
 
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Old Feb 18, 2008 | 10:05 PM
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Originally Posted by lv2race
Check this link for location of the modulator on the trans.

http://www.transmissioncenter.org/a4ld.htm
I didn't look for anything that far down on the housing, but I did look for any hoses hanging down under the van.

I guess I better look again. .... (in the morning)
 
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Old Feb 18, 2008 | 10:05 PM
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OK, I don't have my Aero book anymore so I can't use it for reference. Do you hear hissing when it is running? I don't remember anything in that area other then the tree I mentioned.
 
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