Can someone name this hose? New to the "Aged" VW's. 86 Cabby

[05GTI6677]

Hello there, I just bought my Cabby and I am going through trying to find anomalies and I found this hose that is broken off just on the read end of the valve cover (seen below) I'm sure it's a simple question/answer so if anyone know exactly what it is please fill me in



Closer view...


Thanks!

[ziddey]

That's for the cis injector air shrouding. Maybe the vacuum diagram on the hood will show where it goes. Or block it off. Assuming someone didn't rig the system up incorrectly, you'll probably have a stray hose somewhere in the area.

[fwdvw]

IIRC, that should go to the intake boot that goes over the throttle body. Should be under that boot. If you plug it make sure you close of the other side on the intake boot.

Which reminds me I should check mine too.

[Fat Rabbit]

Those hoses are known for rotting off and causing unmeasured air leaks. I always figured that the VW engineers put them there for a reason and have always restored them. FR

[05GTI6677]

Thanks for the answers! I can't find where it went to though lol I've looked pretty good and haven't seen any stray hoses or anywhere that the hose could have went to...

[Fat Rabbit]

As someone above mentioned -- the "other" end of the hose should have connected to the air intake boot. Someone may have plugged that end or even replaced the boot. The air from the hose kept the injectors cooler and helped with atomization of the fuel. There is an "O" ring gasket under the barb on the head that will sometimes leak and cause issues. Even more likely though -- Some one could have even replaced the head along the way and "added" the connection with the new head. So it wouldn't surprise me if there was no place on the air intake boot for the hose to connect. Cabbies remained MK1s longer than Golfs, Jettas and other models. Some of the MK2 heads (like the ones found on RD engines with the CIS-E injection system) had bigger valves than MK1s so that would have been a good reason to switch to that head if a rebuilt head was needed. FR

[ziddey]

To my knowledge, VW went to air shrouded injectors starting in 84 for the last year of the other A1's. Or was that only for the gti?

Either way, I checked the 86 cabby and it does use air shrouded injectors, so most likely it is stock.

An HT or RD head would have been nice, but I went with a digifant head when I did the swap. No air shroud for me got some nice injector lean going on

[kamzcab86]

http://www.cabby-info.com/

[ps2375]

I read somewhere, sometime ago that the air shroud was for idle emissions, I think it helped with fuel atomization at low engine speeds (idle). I have that port on my head and when it was on CIS, I had it plugged and left it that way when I went MS. Never had any problems passing smog test with either fuel system.

[05GTI6677]

Thanks i'll double check the intake boot, but I think i'll just cap it off and see how that turns out. Could that be the reason my car is stuttering before the engine gets up to temp? I was thinking maybe the coolant temp sensor but maybe I am over thinking and should start smaller.

[ziddey]

yes, fix those vacuum leaks.

no cts for cis lambda. you're dealing with the warmup regulator instead.