1987 S4 auto - vacuum line to transmision missing!
07-05-2003, 05:18 PM
#1
Advanced
Thread Starter
Join Date: Jul 2001
Location: scenic Hudson Valley, NY
Posts: 70
Likes: 0
Received 0 Likes
on
0 Posts
1987 S4 auto - vacuum line to transmision missing!
The shop manuals for the 1987 S4 show that there is a vacuum line off the vacuum spider connection that goes somewhere towards the transmision....Mine is missing the vacuum line as you can see from the photo below:
<a href="http://www.momentoffame.com/snapshot.html?id=43727" target="_blank">http://www.momentoffame.com/snapshot.html?id=43727</a>
The fuel lines are disconnected on these photos for easier access to the MAF intake.
<a href="http://www.momentoffame.com/snapshot.html?id=43728" target="_blank">http://www.momentoffame.com/snapshot.html?id=43728</a>
Can anyone provide me a detailed description as to where/how this vacuum line connects to the auto trany??? I'm not sure how my vacuum line got disconnected...I'm not sure where it gets routed either!!
Photos will be great if you have them...
At the moment the car idles very high at 2700 RPM (cold or hot) in park....While in gear, the RPMs go down a bit around 2000 but it lunges forward in a hurry even without giving it any gas!!! The auto trany shifts late and not very smooth (I wonder why?)...Driving for a while and switching the engine off and on has no effect on the high idle RPMs.
This high idle problem could be vacuum related as well (not sure at this point) but I'd like to correct the vacuum routing to trany first.
Enjoy the holiday weekend everyone...
VK
86 32V auto
87 S4 auto
<a href="http://www.momentoffame.com/snapshot.html?id=43727" target="_blank">http://www.momentoffame.com/snapshot.html?id=43727</a>
The fuel lines are disconnected on these photos for easier access to the MAF intake.
<a href="http://www.momentoffame.com/snapshot.html?id=43728" target="_blank">http://www.momentoffame.com/snapshot.html?id=43728</a>
Can anyone provide me a detailed description as to where/how this vacuum line connects to the auto trany??? I'm not sure how my vacuum line got disconnected...I'm not sure where it gets routed either!!
Photos will be great if you have them...
At the moment the car idles very high at 2700 RPM (cold or hot) in park....While in gear, the RPMs go down a bit around 2000 but it lunges forward in a hurry even without giving it any gas!!! The auto trany shifts late and not very smooth (I wonder why?)...Driving for a while and switching the engine off and on has no effect on the high idle RPMs.
This high idle problem could be vacuum related as well (not sure at this point) but I'd like to correct the vacuum routing to trany first.
Enjoy the holiday weekend everyone...
VK
86 32V auto
87 S4 auto
07-05-2003, 06:05 PM
#2
Cottage Industry Sponsor
Lifetime Rennlist
Member
Lifetime Rennlist
Member
How is that line routed in your '86 auto? It shouldn't be too much different.
Does the idle change, if you close up the hole for the missing vacuum line?
Does the idle change, if you close up the hole for the missing vacuum line?
07-05-2003, 06:56 PM
#4
Advanced
Thread Starter
Join Date: Jul 2001
Location: scenic Hudson Valley, NY
Posts: 70
Likes: 0
Received 0 Likes
on
0 Posts
Nicole....
The idle speed does not change when I plug the missing vacuum hole...My 86 is not close to me right now (in the shop) to check the vacuum stuff....But according to the shop manual the 86 and '87 cars have slightly different vacuum diagrams.
Ernest:
There is NO connection to the ECU for '87 S4 cars...How did you come up with that one??? I know how the vacuum diagram should look like (I have the manuals)..I need someone with an '87 car to describe to me how to connect the vacuum line off the spider to the transmission.
The vacuum connection you labeled "to ECU" actually goes to the fuel dumper on the passenger side....The other one labeled "to diaphram valve" in your photo is plugged up on my car
Enest I think your labeling is wrong!!! Are your using your '91 for reference??? please double check your vacuum connections for '87 S4 cars ONLY.
Regards
VK
The idle speed does not change when I plug the missing vacuum hole...My 86 is not close to me right now (in the shop) to check the vacuum stuff....But according to the shop manual the 86 and '87 cars have slightly different vacuum diagrams.
Ernest:
There is NO connection to the ECU for '87 S4 cars...How did you come up with that one??? I know how the vacuum diagram should look like (I have the manuals)..I need someone with an '87 car to describe to me how to connect the vacuum line off the spider to the transmission.
The vacuum connection you labeled "to ECU" actually goes to the fuel dumper on the passenger side....The other one labeled "to diaphram valve" in your photo is plugged up on my car
Enest I think your labeling is wrong!!! Are your using your '91 for reference??? please double check your vacuum connections for '87 S4 cars ONLY.
Regards
VK
07-05-2003, 10:17 PM
#5
Addict
Rennlist Member
Rennlist Member
Hello VK,
I also had trouble with my vac lines. The PO had almost every line connected incorrectly, and yes, no line to tranny.
The vacant line does go to the tranny. It runs almost strait down from the double T (triple in your case) behind the engine and along the top of the torque tube to a steal/aluminum line that is attached to the top of the torque tube. I found this line hard to find at first, but with a good light and a little squirming I could see it.
I attached the rubber connecter to the vac line and then used (2) 12-inch needle nose pliers to connect the rubber end to the steal/alum vac tube (to tranny) on the top of the torque tube. I used one plier to hold the little tube steady and used the other pliers to push the connector firmly on the tube. I think that I removed one of the small heat shields to get more working room. Room is tight here, as you are reaching past the exhaust and the torque tube.
I then worked the vac line up to the T and cut it at the right size, then connected it.
The other end of the vac line to the tranny is also a standard plastic flexible tube. It presumablely (I could not see it) connects to the other end of that steal/aluminum tube, and then connects to the tranny on the drivers side forward of the CV axel. My connection was still intact here.
Hope this helps, and good luck with the high idle,
Mike
I also had trouble with my vac lines. The PO had almost every line connected incorrectly, and yes, no line to tranny.
The vacant line does go to the tranny. It runs almost strait down from the double T (triple in your case) behind the engine and along the top of the torque tube to a steal/aluminum line that is attached to the top of the torque tube. I found this line hard to find at first, but with a good light and a little squirming I could see it.
I attached the rubber connecter to the vac line and then used (2) 12-inch needle nose pliers to connect the rubber end to the steal/alum vac tube (to tranny) on the top of the torque tube. I used one plier to hold the little tube steady and used the other pliers to push the connector firmly on the tube. I think that I removed one of the small heat shields to get more working room. Room is tight here, as you are reaching past the exhaust and the torque tube.
I then worked the vac line up to the T and cut it at the right size, then connected it.
The other end of the vac line to the tranny is also a standard plastic flexible tube. It presumablely (I could not see it) connects to the other end of that steal/aluminum tube, and then connects to the tranny on the drivers side forward of the CV axel. My connection was still intact here.
Hope this helps, and good luck with the high idle,
Mike
07-06-2003, 05:11 PM
#6
Rennlist Member
Join Date: Mar 2003
Location: Nashua, NH
Posts: 4,328
Likes: 0
Received 0 Likes
on
0 Posts
Hey Athenian,
NOTHING will change when you "plug the missing vacuum holes". The vacuum line needs to be connected to your transmission to work. AFTER your connections are made you'll need to plug and remaining vacuum leaks.
NOTHING will change when you "plug the missing vacuum holes". The vacuum line needs to be connected to your transmission to work. AFTER your connections are made you'll need to plug and remaining vacuum leaks.
07-06-2003, 06:40 PM
#7
Three Wheelin'
Join Date: May 2001
Location: Hudson Valley NY
Posts: 1,641
Likes: 0
Received 0 Likes
on
0 Posts
VK
Like mike said,
Pressure reg. passenger side ------ pressure damper driver’s side rear
Transmission modulator ------- Pressure damper driver’s side front
Blocked ------ ?????????
The modulator is on the driver’s side middle of the transmission, there is a plastic nipple on it which has a short piece of vacuum rubber hose that connects to a metal line routed on the toque tube ending behind the engine bell housing to witch a another piece of rubber hose is connected to the plastic vacuum hose that you are missing.
Like mike said,
Pressure reg. passenger side ------ pressure damper driver’s side rear
Transmission modulator ------- Pressure damper driver’s side front
Blocked ------ ?????????
The modulator is on the driver’s side middle of the transmission, there is a plastic nipple on it which has a short piece of vacuum rubber hose that connects to a metal line routed on the toque tube ending behind the engine bell housing to witch a another piece of rubber hose is connected to the plastic vacuum hose that you are missing.
Trending Topics
07-07-2003, 04:20 AM
#8
Rennlist Member
The vacuum line from the heater valve will go inside the cabin, behind the console to the control valve assy. Remove the sides of the console to get access. When you select heat, it will remove vacuum from that line, and it will open to let hot water through. When you select anything cold (eg AC on), it should put vaccum on that line and shut the valve. If the controller is faulty, or the heater valve leaks air, plug the line, and tie the valve shut with a cable tie. See Tony's site for lots of stuff on this (v1uhoh).
hth
jp 83 S
hth
jp 83 S
