What the hell is it
What needs to be done is a picture of the actual LIM on the car to verify, but its an n/a, and the only thing coming off the manifold right there is that metal line for the booster.
HAILERS
Joined: May 2001
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From: FORT WORTH, TEXAS,USA
I'll scan a picture tomorrow. I was too lazy to look in the shed at the junk there and gave a flip answer. Could look at the wife's car also, but......I'm lazy. The Scathcat is most likely right. Got work to do now.
Joined: Dec 2001
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From: NY, MA, MI, OR, TX, and now LA or AZ!
Originally Posted by NZConvertible
Actually that picture is from page F1-4 of the S5 FSM, which incorrectly shows the EGR valve (with no label). So either both S4 and S5 engines have the same split air nipple or it's another mistake. 
Great to see and answer finally!
Great to see and answer finally!
Joined: Oct 2002
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From: California & Florida
Ok.. that would be the feed from the air pump to the cat? If I have blocked off the ACV & removed the air pump. Can I leave this large nipple open? I have been for some time now with now apparent effect. My cats are long gone.
Ramses666
Ramses666
I wish I was driving!
Joined: Dec 2001
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From: BC, Canada
Originally Posted by HAILERS
Bunch of dummiies. It's where you connect the brake booster feed. Different than a turbo feed tube. Noooooobies all.
IIRC, the brake booster line bolts on via a banjo bolt onto LIM beside the ACV.... this is not what's pictured, as far as I can tell.
I wish I was driving!
Joined: Dec 2001
Posts: 5,241
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From: BC, Canada
Originally Posted by ramses666
Ok.. that would be the feed from the air pump to the cat? If I have blocked off the ACV & removed the air pump. Can I leave this large nipple open? I have been for some time now with now apparent effect. My cats are long gone.
Ramses666
Ramses666
Yes.
If the ACV is removed and the passages sealed (gasket or ACV on the block off plate), you can leave that nipple uncapped without causing any vacuum leaks or any other problems.
HAILERS
Joined: May 2001
Posts: 20,563
Likes: 27
From: FORT WORTH, TEXAS,USA
Originally Posted by scathcart
On the S4 N/A intake manifolds, the ACV dumps the air to the cat through the intake manifold at that nipple. That nipple comes out of the back of the LIM as shown and connects to a piece of rubber pipe, which connects to the catalytic convertor via a pipe with a check valve on the end.
Its not the brake booster line.
Its not the coolant line.
We know its an S4 N/A... look at the EGR valve located on the center iron.
Look at the ACV valve... Hose going into the ACV from the air pump, but no hose coming out of the ACV.
On the S4 turbo models, the air also travels through the LIM, but there is no nipple. In its place is a flange mounted pipe, mounted on the back edge of the runners. The EGR valve on the turbos is located where this pipe is shown.
Answer: Its the split air pipe which connects to the catalytic convertor on an S4 N/A only.
Its not the brake booster line.
Its not the coolant line.
We know its an S4 N/A... look at the EGR valve located on the center iron.
Look at the ACV valve... Hose going into the ACV from the air pump, but no hose coming out of the ACV.
On the S4 turbo models, the air also travels through the LIM, but there is no nipple. In its place is a flange mounted pipe, mounted on the back edge of the runners. The EGR valve on the turbos is located where this pipe is shown.
Answer: Its the split air pipe which connects to the catalytic convertor on an S4 N/A only.
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