MIDN1T3
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Re-routing AC Idle up vacuum hose Gen 3 *Now with pictures*
Hey all, So have a small problem here. I recently put in a top mount intercooler which got rid of all the old pipes going to the side mount intercooler...scroll down the page to see http://www.mr2australia.com/mr2play/tm.aspx?m=47253&mpage=6 By doing this, I no longer have the nipple on the hotpipe to plug the vacuum hose that leads to the AC idle up sensor. Where should I re-route it? I initially was going to get a nipple welded onto BOV adapter pipe once I had everything sorted, but surely there is another place that it can be plugged into? I also noticed the Gen 2 hotpipe does not have this nipple, and since the AC idle up is the same on both Gen 2 and Gen 3, where does the vacuum hose plug into? Any help would be appreciated :)
post edited by MIDN1T3 - 2014/01/20 11:36:28
1990 SW20 MR2 N/A with 1994 Gen 3 GTS 3S-GTE swap.
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track_mr2
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Re: Re-routing AC Idle up vacuum hose Gen 3
2014/01/19 18:13:08
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It's just the idle up for when the air con is on so anywhere after the throttle body butterfly is fine. You probably have the small vacume line that runs to the top of the BOV right? You could try a T piece in there and see if it all works fine. It should work from there fine.
*EDIT* actually before doing that check if the vacume line to the BOV is after the throttle body butterfly. Thinking about it, that vacume is probably before the butterfly so don't put it there.
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MIDN1T3
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Re: Re-routing AC Idle up vacuum hose Gen 3
2014/01/19 21:26:44
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Track_mr2 - The original ac idle up vacuum hose ran to the hotpipe which is before the throttle butterfly. So you're saying I can put it after the throttle butterfly? (just double checking we are on the same Page lol)
Anyone out there with a Gen 2? I'm really interested in seeing where the vacuum hoses. I know one goes to the bottom of the intake manifold, where does the other one go?
1990 SW20 MR2 N/A with 1994 Gen 3 GTS 3S-GTE swap.
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artymr2
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Re: Re-routing AC Idle up vacuum hose Gen 3
2014/01/19 22:29:41
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We did a gen 3 turbo into a 1990 JDM turbo swap and pretty sure there are no vacum hoses in the hot pipe.
Cheers
Black SW20 GT Turbo T-top 
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MIDN1T3
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Re: Re-routing AC Idle up vacuum hose Gen 3
2014/01/19 22:39:24
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Artymr2 - I'll post up a picture tomorrow, it's directly underneath the BOV flange.
I have also a spare gen 2 hotpipe and it doesn't have it - your hotpipe may have been swapped out.
1990 SW20 MR2 N/A with 1994 Gen 3 GTS 3S-GTE swap.
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artymr2
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Re: Re-routing AC Idle up vacuum hose Gen 3
2014/01/19 22:43:58
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Also have a gen2 hot pipe and don't recall any other connections apart from the BOV. Pic should resolve it.
Did you swap the charcoal canister ? That had other bits on it from memory on the gen 3.
Cheers
Black SW20 GT Turbo T-top
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dasic1
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Re: Re-routing AC Idle up vacuum hose Gen 3
2014/01/19 23:00:26
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It can be tapped into anywhere from the air filter to turbo pipe, turbo to IC or IC to throttle body. It needs to before the butterfly. The Vacume line to the blow off valve is no good.
You could not hook it up and it will still work but then you are letting un filtered air in
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dasic1
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Re: Re-routing AC Idle up vacuum hose Gen 3
2014/01/19 23:02:21
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MIDN1T3
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Re: Re-routing AC Idle up vacuum hose Gen 3
2014/01/19 23:14:46
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Thanks Dasic1, that's the one.
I did have it unhooked but under boost it lets out air and hence doesn't hit full boost.
1990 SW20 MR2 N/A with 1994 Gen 3 GTS 3S-GTE swap.
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artymr2
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Re: Re-routing AC Idle up vacuum hose Gen 3
2014/01/19 23:36:34
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That is weird. Ours definitely does not have that nipple and I have seen many other gen3s that don't either. Maybe it's a certain year or feature equipped engine only ( eg traction control ?)
Cheers
Black SW20 GT Turbo T-top
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dasic1
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Re: Re-routing AC Idle up vacuum hose Gen 3
2014/01/19 23:37:53
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Yeah air would come out of the IC pipe. I meant you could leave the Idle up valve not connected to anything and it would still work, but not a good idea as when it opens it would be letting un filtered air in
You should have another idle up valve bolted to the bottom of the intake. You could T it into there
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MIDN1T3
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Re: Re-routing AC Idle up vacuum hose Gen 3
2014/01/19 23:57:17
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Artymr2 - interesting. Where do your two ac idle up vacuum hoses go?
1990 SW20 MR2 N/A with 1994 Gen 3 GTS 3S-GTE swap.
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artymr2
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Re: Re-routing AC Idle up vacuum hose Gen 3
2014/01/20 00:35:09
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Not sure I would have to check. Where is the AC idle up located? I thought the idle was all regulated by the throttle bypass valve?
Cheers
Black SW20 GT Turbo T-top
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track_mr2
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Re: Re-routing AC Idle up vacuum hose Gen 3
2014/01/20 06:57:53
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MIDN1T3
Track_mr2 - The original ac idle up vacuum hose ran to the hotpipe which is before the throttle butterfly. So you're saying I can put it after the throttle butterfly? (just double checking we are on the same Page lol)
Anyone out there with a Gen 2? I'm really interested in seeing where the vacuum hoses. I know one goes to the bottom of the intake manifold, where does the other one go?
Mines a gen 3. It has a hose coming out after the throttle body (on the back left) of the intake plenium going to the idle up. The other end goes back to the intake.
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track_mr2
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Re: Re-routing AC Idle up vacuum hose Gen 3
2014/01/20 08:13:24
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Lol, now im with ya. You lost the intake side connection when you changed intercoolers. Sorry I thought you we after the connection to the intake plenium. Yeah so anywhere before the throttle body is fine. If it were me I would drill and take a connectioin to the intake. Yeah leaving your intake side idle up not connected will work fine but as dasic1 said it can suck unfiltered air which isn't ideal. The other option is you can put a vacume line filter in. then leave it not connected to anything if you really want to avoid drilling anything.
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