Where does this hose go?

[Ricks911s]

This hose comes from . . .



The hose of concern is the one that runs horizontal in the picture. In the picture above you can see it comes from the back left of the engine bay. It forks . . . and then poof! Don't know where it goes. So it's hanging out as seen in the first picture.

The story of the car is a good one. Got the car near Sacramento, in Orangevale. It was towed to the east bay where it resides. Hadn't run in over 7, 8 years. My dad and I had a hell of a time figuring out why she wouldn't start. Low and behold, the control plunger was stuck. Anyway, my dad and I (when I could come down to work on it) have her running, driving, and almost ready to be a titled, smogged (?). Smogging might prove a bit difficult. She smokes a bit too after she runs (which worries us). All the old oil underneath has burnt off. So hopefully our problems arn't major. As the new guy around here, I'd appreciate any help--first, and most importantly, where the heck this hose goes!

Here's a pic . . . although not a great one.



And the happiness on my dad's face when we revived this beast after 7+ years!



Thanks.

[jhubs]

That's a water hose.. goes to the radiator...

Very nice car !!!!

[Zef]

You look very happy Rick....! Very nice 911...and welcome aboard...!

[moosthuizen]

I'm not sure, but could be the vacuum hose for brake boosting?

If it is remove the CIS rubber on the top, that connects from throttle plate to the manifolds, you know that big boot one. That will give you more space and a better look at where it connects to the back of the throttle body.

If it is not connected, and you reconnect, it would run much better, for disconnected you may have a vacuum leak which is a big no for CIS, which is highly dependant on an exact measurement between air and fuel.

[Ricks911s]

Thanks for all the help so far. I will take suggestions and get back to everyone. Any other ideas are welcomed as well. zefsuper911, a correction. the picture above is my dad. But I look just as happy (as the younger version).

[Gunter]

There is a procedure for bringing an engine back to life after a long storage. Just turning the key is bad.
If the car was not properly prepared for storage, i.e. full tank with Stabil and FI cleaner run through the system, you'll find more problems in the future. Dirty oil for storage is bad, not turning it over is bad and so on....
Looks like a '78 or '79 with the EC pump.

I cannot see how it would pass without a very serious tune-up and checking out why it smokes? Like compression/Leak-down test.

Make some room by removing the cruise control and heater blower.
Then you can see where the hose connects at the other end.
Could be part of the evaporator system (Charcoal canister)
To learn more about the car, get the Bentley SC Repair Manual.

[Ricks911s]

Should have mentioned. Car is 1976 911S.

[sjepps]

I think that is the vent hose off the cruise control actuator. I believe the smaller hose on cruise control actuator just behind the one you are asking about supplies the vacuum to operate the actuator and the larger hose vents the actuator. The unconnected end is left open to the atmosphere and routed downward thru a slot between the engine tin and the car body behind the engine almost exactly in the center. At least, from memory that was the way it was on my 1981SC. With the car running you could check the smaller line for a vacuum and see if the actuator will work with the the larger hose disconnected. You could then check the disconnected end for vacuum to verify this isn't causing a vacuum leak. Please be advised this is from my somewhat faulty memory. Good luck.

sjepps

[sig_a]

Originally posted by sjepps
I think that is the vent hose off the cruise control actuator. I believe the smaller hose on cruise control actuator just behind the one you are asking about supplies the vacuum to operate the actuator and the larger hose vents the actuator. The unconnected end is left open to the atmosphere and routed downward thru a slot between the engine tin and the car body behind the engine almost exactly in the center. At least, from memory that was the way it was on my 1981SC. With the car running you could check the smaller line for a vacuum and see if the actuator will work with the the larger hose disconnected. You could then check the disconnected end for vacuum to verify this isn't causing a vacuum leak. Please be advised this is from my somewhat faulty memory. Good luck.

sjepps

This larger cloth type vent hose connected to the cruise control remains open and unconnected at the other end. On my 1987 Carrera 3.2 it sticks vertically into an oblong hole at the lower end of the firewall and directly at the back (front) of the centerline of the engine. Mine does not fit thru the engine tin. It's very hard to see clearly, but it looks like the hole is on the top side of some sort of a structural channel running laterally the entire length of the firewall. The hose length will get you within about 6 inches of the location when stretched to its full length toward the center of the car. You will probably feel it before you see it. Complicated explanation -- hope it helps.