How to change vacuum lines for idle control valve

[Tidybuoy]

Does anyone have any advice for changing the vacuum lines that go to the idle control valve? It's located under the intake manifold and it looks like I may need to be a midget to get at it.

I'm hoping that I don't have to disassemble the whole car and that there is some trick that I haven't thought of.

Any advice would be appreciated.....................Vern

[EMBPilot]

yep, you need a midget OR see this thread..
Intake, Vacuum, Idle Control, Fuel ect project

[Tidybuoy]

Darn!

Looking at your photos...it looks like the intake manifold it removed. I was hoping that this would be easier.

Oh well, as long as I'm going to have to go that far, I might as well get all of the vacuum hoses before I begin.

Thanks for the photos....that helps...................Vern

[nynor]

check out arnnworx.com before you get started. he has a great write up for replacing all the rubber bits with inexpensive tubing, which you may as well do, while you are in there. its not really difficult to get in there, but hard enough to make me only want to do it on occasion.

[EMBPilot]

the long project thread i started was for the same reasons your seeking here. if the manifold is going to come off, just get all that other stuff done while your there. the most expensive part was purchasing the new ISV for 180 bones. aside from that, all the other parts for this sort of project wont cost you much except for some loving time with your 944. its pretty straight forward stuff. and your car will thank you when its all done.

[djnolan]

Did someone say this could be done without removing the intake? Well I managed to get the old hoses and ICV out with some difficulty. None of the clamps were facing in the direction where you could easily put a wrench on them.

Putting it back together should be somewhat easier I expect. I can control which directions the clamps face and should be able to tighten things up nicely. Just need a 1/4 inch swivel and maybe a flexi extension.

Now what about that plastic housing that the oil fill spout is attached to? Doesn't look like it can be replaced without removing the intake. With the vent hose removed should I pour some cleaner through it?

Hua!

[924Sman]

Yep intake must be pulled and you will not regret doing it. Replace the oil seperator seals while you are in there!!! I just had to replace all lines under it and can be purchased here at Pelican. The reason to pull the plenum...there is one small hose that is attached to the underside of the plenum and impossible to remove or see the cracks it most likely has if an OE hose. So the moral is to pull it to see all and any issues.

Also make certain the hoses go on the the correct flow(arrows) on the ISV, or you will be doing this job 2x's.

Dal

[Porsche-O-Phile]

You can do it without removing the intake, however it's actually simpler and will take less time/fighting with stuff to remove the intake.

It's not that bad. You should be able to have the intake off in about 10 minutes if you're not screwing around.

[Techno Duck]

With the intake off, its a good time to replace the two o-rings on the air oil separator and the idle control valve.

[djnolan]

Thanks for all of the help, everyone. Looks like replacing the hoses is possible with the intake on but the oil separator o-rings can't be accessed. Does the oil separator need to be cleaned or replaced, too?

[DanAllen944]

+1 on doing the AOS seals at the same time. I will be best to pull the intake and replace all the hoses while your in there.
Just be glad you have a late car. One of the hoses under there for the early car is really expensive.

[bholmes]

I just did mine with out removing the intake. The irony was it was OK when I had the manifold off and it got damaged when putting the manifold back on. It's doable, I did it in an hour or less. For me it was faster than taking the manifold back off. But it sure was a PIA.