Where to find vacuum system diagram? - JeepForum.com

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post #1 of 8 Old 07-16-2010, 11:04 PM Thread Starter
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Where to find vacuum system diagram?

I am at a loss I have searched for diagrams for the vacuum lines under my hood and the one I found is vague and not really helpful. Does anyone know where I can get some decent diagrams?

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post #2 of 8 Old 07-17-2010, 01:49 AM
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Well, if it was a 1985, I have a diagram kit from Little Jess Jeep in Quincy, Ill. They were nice enough to photocopy what they had for my model year. (They are like the only licensed dealership for Jeep within 100 miles of me.)

Your best bet is to get to a Jeep dealership and ask them to photocopy the vac line diagrams they have for your model year.
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post #3 of 8 Old 07-17-2010, 02:37 AM
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Might be a long shot but if you post a link to a picture of it, maybe someone can look under their hood and tell you where it should go.

Edit: After another read I realize you weren't asking a question about a specific line.


"You can set my jeep on fire and roll it down a hill,
But I still wouldn't trade it for a Coupe DeVille."


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post #4 of 8 Old 07-17-2010, 06:45 AM
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I've seen one somewhere. Can't think of it now.....................
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post #5 of 8 Old 07-18-2010, 10:06 AM
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If your year is anything like this (My 88 and my 90 are just like this) it should help.

Rear CCV to intake manifold (one line), MAP to throttle body (one line), fuel pressure regulator to manifold (one line). Front vac harness: Large line from valve cover to air box, large line in intake tube to fuel cannister. Two small lines to manifold fitting, one to EGR solenoid then out of solenoid to EGR. One out of rear of airbox to front vac motor of airbox.

With an after market intake (K/N etc.) you only need the EGR route and the front valve cover to intake lines. The others can be eliminated or plugged at the harness connection. The other (larger fitting) towards the rear of the manifold behind the TB for th brake booster. Hope this helps you.

1990 XJ Laredo - White & Chrome
1988 MJ Pioneer - Metallic Green and Black

Last edited by Paradise XJ; 07-18-2010 at 10:19 AM.
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post #6 of 8 Old 07-18-2010, 01:27 PM
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There are a few diagrams similar to the one above floating around the internet, including a handful of helpful things at this one French site. I don't want to post links for fear of the banhammer, though. PM me and I can point you in the right direction.

by the thing that spins when you drive underneath
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post #7 of 8 Old 07-18-2010, 07:28 PM Thread Starter
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That seems to be the only diagram i can find, im looking 4 where the vacuum lines for the hvac hook up and if there are any vacuum lines on my tranny and where they go..in the above diagram there is a vacuum fitting that doesnt have anything hooked up to it does anyone have anything hooked up to it or is it just plugged?
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post #8 of 8 Old 07-19-2010, 06:21 AM
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That vacuum fitting is possibly the source port on the intake. From it a hose runs across the firewall, forward on the front inner fender, behind the bumper, to the vacuum reservoir. Returning from the vac res is a line that runs to cruise control and through the firewall on the passenger side to your HVAC stuff. Coming back out of the firewall at the same location is a purple plastic vac hose with a 90* rubber elbow which attaches to your heater control valve.
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