And does it require a line connected to it? And if the answer is yes, where would I find the line (I can't see any loose ends in that region)?

Thanks.

 

Would that cause a boost leak (with it not connected or plugged)?

And what is the rack? Where would I find the loose end that should otherwise connect to it (even if I choose to cap it off I'd still like to know)?

 

What's the double throttle used for? I have no idea what it is or anything. Li'l help?

 

The double throttle is used for controlling the warmup stage. The ecu will not allow full throttle untill the car is completely warmed up. It is just a safety mechanism, most people disable it or remove it completely, just remember to warm up the car before going WOT.
There is a vacuum line that comes from one of the solenoids that connects to it (the actuator). U could get vacuum leaks during the warmup stage, when the solenoid opens up to control the DT actuator.

 

Yea, if the other end of that vac line is not blocked off I believe it will cause a leak. If memory serves me right (which it might not lol) I think it goes back to the first solenoid on the rack.

STEPHEN

 

It doesn't make any difference if the actuator itself is plugged or not since there isn't a hose going to it. the valves stay open when the actuator is open to the atmosphere so it doesn't matter.

What does matter is the hose that ran from the rear metal pipe under the UIM. If that was left open then you will have a vacc leak. Plug that.

 

Is the double throttle related to the AWS system?

 

Anyone have an image or a really detailed description of where the hose that connects to it originates? I can't see anything that's not connected in the area behind the manifold.

 

Know it, love it..

 

I see conflicting comments concerning whether or not there should be a line hooked to the exposed nipple in the image (in the close up section, it's rounded, pointing towards the back of the car, sticking out of the round thing).

Rikki said "Yes it needs to be plugged or connected to the rack."

While ES said "It doesn't make any difference if the actuator itself is plugged or not since there isn't a hose going to it."

And in the shop manual (F-76 Intake Air System, from a 94 shop manual, small print edition) it appears that a vacuum line should be hooked to the nipple (#10 in the diagram, noted as a Vacuum Hose).

 

What they are saying is that the nipple on the Double Throttle control doesn't need anything attached to it.

However, if you have the vacuum hose that is connected to it just hanging somewhere, it will create a vacuum leak UNLESS you connect it to the Double Throttle control where it belongs or plug it (and connect nothing to the Double Throttle).

You probably have that hose stuck somewhere underneath the UIM.

 

Thanks Mahjik, I thought that might have been the case, I was just looking for clarification.

One questions still remains, where does the line that would/could connect to it come from.

Here's an image from the shop manual. Where does that line come from?

Thanks.

 

If you look in the large digram I posted, you'll see it come from underneath the UIM.

Usually when I work on my car, those types of lines I stick along the firewall area so they don't get trapped underneath the UIM when that's getting reinstalled.

 

Right now the Robinette site is down.

 

If you check out the vac line diagram shown above your'll notice it goes to a hard line on the rack then turns back into a vac line which goes to the vac chamber then to the #1 solenoid.

Like mentioned by Mahjik, it doesnt really matter about caping the acuator but the loose vac like somewhere will cause a leak bacause your vac chamber wont hold a vacume/pressure with a exposed end

STEPHEN

 

Hmmm, you must be having a routing problem as I can get to the site without a problem. Anyway, the line runs from underneath the UIM. If you don't see it on the firewall side of the UIM now, then it's probably stuck underneath it.

 

Someone should mirror the robinette site just in case it ever gets hacked or accidentally erased. That would be an incredible loss

 

Here ya go:

 

If I'm reading the diagram correctly then the double throttle line ends up plugging into a vacuum chamber (assuming it's the line going north where the words "CHECK VALUE" break up the image of the lines.

Where might I find that vacuum chamber? I'd like to see if it's already plugged.

I have my UIM off, and I can't see any extra lines in the area under it. I will say it's a lot easier to take it off the 2nd time... I think it took me about 90 minutes to prepare to change the plugs, this time it only took about 15.