vacuum routing assistance(CTO) needed - JeepForum.com

 
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post #1 of 10 Old 03-25-2008, 07:45 PM Thread Starter
schwim
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vacuum routing assistance(CTO) needed

Hey there guys,

Info is tight in the YJ camp for some aspects of the vac system, in particular the CTO valve and evap canister.

I'm wondering if I can use the diagram in this thread to go by. I ask because everything I read told me to cap the one unused port on the CTO valve, while this guy's diagram leaves it open. I have Elvis' diagram as well, but it doesn't label the evap can at all, and he doesn't tell whether to plug the 5th port or leave it open.

In another thread, someone stated that the canister is labeled for which lines go where, so I'll try to find them tomorrow.

thanks,
json


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post #2 of 10 Old 03-25-2008, 07:49 PM
Crash1
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Look here http://home.sprynet.com/~dale02/list.htm

89 RED YJ, fresh rebuilt 4.2L , Howell TBI, HEI, 2.5"RE HD Lift, 1" BL, 31" TIRES
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post #3 of 10 Old 03-25-2008, 07:56 PM Thread Starter
schwim
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Got it already, thanks. It only adds to the fact that nobody can agree on anything, once the vac system has been modified by nutters and carb mods.

5th port, capped or not?

thanks,
json

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post #4 of 10 Old 03-25-2008, 09:28 PM
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most diagrams don't mention that extra port but the instructions I got with my howell kit specifically say that it's a vent and left open.
Attached Thumbnails
evap.JPG   cto.JPG  

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post #5 of 10 Old 03-25-2008, 10:01 PM Thread Starter
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That's awesome, man. Thanks very much for that.

thanks,
json

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post #6 of 10 Old 03-26-2008, 12:53 PM
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I run mine just like the sprynet site, but tapped off of the ported line for the distributor after doing the Nutter.

I take it that CTO made it safely??

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post #7 of 10 Old 03-26-2008, 05:38 PM Thread Starter
schwim
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Indeed Tim, thanks very much.

I'm not sure what you mean about tapping off of the ported after doing the nutter. What changed for you from sprynet's or Elvis' diagram post-nutter?

thanks,
json

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post #8 of 10 Old 03-26-2008, 09:06 PM
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All the CTO valve does is prevent ported vacuum from reaching the EGR and canister before the engine is warmed up. It's just a valve that opens between the vacuum source (the engine) and the devices that use it (EGR and Canister) after the engine has reached a certain temperature. The extra port comes sealed from the factory... I don't really see the advantage of opening it up. At best, if the port isn't connected to anything, opening it will do absolutely nothing. At worst, if the port connects to the others, it will create an enormous vacuum leak.

As for the canister ports, they are labeled on the top of the housing. The Howell diagram above looks correct, execpt the one marked "tab" would be connected to your carb vent (if your carb has one). I would check the top of the canister to be sure though.

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post #9 of 10 Old 03-26-2008, 09:14 PM Thread Starter
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Quote:
Originally Posted by Tshark299 View Post
....At best, if the port isn't connected to anything, opening it will do absolutely nothing. At worst, if the port connects to the others, it will create an enormous vacuum leak.
Heya tshark, and thanks very much for your reply.

That was my concern. I just didn't want to introduce a huge vac leak once it warmed up

One more question. Is the CTO valve install a compression fit only, or do I need to use a sealant of some kind?

thanks,
json

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post #10 of 10 Old 03-26-2008, 11:15 PM
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Quote:
Originally Posted by schwim View Post
Indeed Tim, thanks very much.

I'm not sure what you mean about tapping off of the ported after doing the nutter. What changed for you from sprynet's or Elvis' diagram post-nutter?

thanks,
json
I wasn't clear. I used a "T" fitting in the line going back to the distributor vacuum advance. I just used it as the ported source, because I need all my crap to still look stock to pass CA emissions.

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