Anyone have a picture or diagram of the hose orientation on the idle up valve?

[AlpineAccess]

I replaced my idle-up vac hoses about a month ago and feel weird about the orientation of my hoses. I pulled them both while replacing and am now wondering if someone with a stock cruiser would mind taking a picture of their idle up hoses and the orientation the plug into the valve. I haven't put many miles on the cruiser since I installed them - while checking fluid levels today I glanced at the hoses and it got me thinking.

One line connects to the top of the intake manifold and the other connects to the air box.

 

[Eicca]

IIRC it doesn't matter, since all that the valve does is allow air to pass through when enough load is placed on the power steering pump. No matter which way the hoses are strung, it'll operate the same.

 

[AlpineAccess]

IIRC it doesn't matter, since all that the valve does is allow air to pass through when enough load is placed on the power steering pump. No matter which way the hoses are strung, it'll operate the same.

Thanks for the input. So to say that back to you the way I'm hearing it: when a great enough load is placed on the power steering pump to reduce revs, the idle-up opens a non-directional valve and introduces un-metered air to the intake manifold to increase revs.

In looking at the idle up diagram, I don't see where its input to perform the open/close function comes from? It would seem the most logical way to do this would be via vacuum. This is why I was leaning towards the valve being directional. In essence, intake manifold vacuum increases as power steering load climbs, idle up opens from that vacuum and pulls un-metered air from filter box.

 

[Eicca]

It opens via pressure from the power steering pump. Somehow. But other than that, correct. Technically the air through the valve is metered because it's after the MAF sensor.

 

[MUDZLLA]

not sure if this helps. my original hose orientation after removing the air box...

 

[Dirt Ferguson]

For the shorter hose of the Idle-up pair, the top end goes in the airbox and where should the lower end be attached? I cut off the cracked part and re-attached it to the airbox.

Mine (smaller of the two hoses) came undone when I removed my airbox to replace plugs and coils tonight.

Thanks.

 

[T4R2TLC]

It should attach in the same location as the other hose, there are two barbs on the valve. If it split that badly, you'll need to replace the whole hose soon, the other ends are likely just as bad. You could get the factory hoses with valve or just buy some metric silicone vacuum hose and replace all your vacuum lines at once.

 

[Dirt Ferguson]

@T4R2TLC thanks, after looking at a few diagrams last night I figured it out. New hose will be on order. Any idea what size metric hose is needed for the other vacuum lines?

I know there a few different sizes.

 

[T4R2TLC]

I purchased this kit from Amazon along with new hose clamps. IIRC 6mm was the most common and more than 4ft of 6mm would have been useful. However, 8mm worked fine s a substitute. No 10mm was needed, but I used 4-5" of the 4mm ID. 8mm is also needed for some lines even if you have plenty of length in 6mm. The idle up hose is 6mm ID both directions IIRC.

https://www.amazon.com/dp/B0B659HZ69?ref_=pe_386300_442618370_TE_sc_as_ri_0

 

[Dirt Ferguson]

Thanks! @T4R2TLC