Vacuum lines diagram - JeepForum.com

 
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post #1 of 13 Old 05-19-2009, 10:20 PM Thread Starter
funnynyck
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Vacuum lines diagram

for a 1996 Cherokee XJ, any idea where can I download it? Trying google, no luck so far.

Brake is acting weird, pedal feel not good, whenever I floor the throttle pedal the A/C Blower changes ducts from the front ones to somewhere else, no air comes out from the vents but i can hear blower working 'woooooooo' and gets back to the front vents slowly when i release the throttle... The jeep starts and coughs for some seconds and then gets up slowly, press the throttle even slightly it goes off. And it nevers starts on the first crank, no matter how long you keep it cranking.

I tried chasing the vacuum lines, I was going bonkers chasing them. Since I don't know much about how they work as well, could someone be generous and explain in simplest form that how that vacuum system works, for a start..

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post #2 of 13 Old 05-20-2009, 12:37 AM
keepishop
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Check the vacuum canister in your bumper for leaks in it or the lines leading to it. Most common sign of it's failure is air out the defrost vents only.


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post #3 of 13 Old 05-21-2009, 07:27 AM Thread Starter
funnynyck
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Mine is not in the bumper, its placed near the firewall, where I think the blower motor is.. mine is a RHD btw.

I've checked the canister, it seems to be okay, the third inlet/outlet/slot w/e it is, has to be connected or not? I've three slots on the canister, and 1 of them isn't connected to anything..
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post #4 of 13 Old 05-21-2009, 08:48 AM
Saudade
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Try using the search function in this forum.

You canister was relocated. You likely have a custom bumper so the PO moved it. Yes, all fiittings should have a line or cap. The reservoir holds vacuum for the HVAC vents and the Cruise Control.
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post #5 of 13 Old 05-21-2009, 11:43 PM Thread Starter
funnynyck
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I don't think that it was relocated, the PO didn't bother to change its engine oil, let alone doing something like relocating the canister, it must have to do something with LHD and RHD, mine is a RHD. I don't have a custom bumper or anything, its all stock except the steering gearbox.

And I used the search function, yes there are diagrams, but I need something for a 1996 XJ, and clear, not small that I go on finding those things in the diagrams first..
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post #6 of 13 Old 05-22-2009, 07:00 AM
khurley
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I also have a 96 cherokee, and my canister is also against the firewall.

I just put in a reman, and now I only get air blowing through the defrost vents. the jeep is also hesitating and backfiring, is that what yours is doing?

sorry I didn't have much to offer, but I am having some of the same issues.
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post #7 of 13 Old 05-22-2009, 07:58 AM Thread Starter
funnynyck
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Yeah, when it starts up I have to let it idle rough for a few seconds, If i press the throttle it backfires and dies.. and then starts up just fine..


You could have the diagrams maybe? If you could email them to me, that'd be great.. My vents system is working fine..

and Oh, the brake pedal feel is nasty aswell, its not soft, not hard, its well *slow*..
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post #8 of 13 Old 05-22-2009, 08:04 AM Thread Starter
funnynyck
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it also sometimes revs itself to 3k RPMs and thats well, really really nasty!
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post #9 of 13 Old 05-22-2009, 08:08 AM
Saudade
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Quote:
Originally Posted by funnynyck View Post
I don't think that it was relocated, the PO didn't bother to change its engine oil, let alone doing something like relocating the canister, it must have to do something with LHD and RHD, mine is a RHD. I don't have a custom bumper or anything, its all stock except the steering gearbox.

And I used the search function, yes there are diagrams, but I need something for a 1996 XJ, and clear, not small that I go on finding those things in the diagrams first..
Are you sure it's the vacuum reservoir and not the Evap canister?

When under heavy acceleration, the engine operates at low vacuum. If there's a leak, then there's not enough vacuum to maintain the door positions and they default to Defrost. Once you back off, the engine vacuum rises and the doors go back to normal. A big enough leak would affect eng op as well.

While climbing up mountain passes, my cruise control (also vacuum operated) will quit until I cross the summit.

I don't have a 96 manual but will check. You can also try Autozone.com. The have repair guides online. You have to register, but it's free.
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post #10 of 13 Old 05-22-2009, 11:54 AM Thread Starter
funnynyck
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I dont know what is an evap canister, thats why i needed to know how the vacuum system works.. what goes where..

Do care to tell me about the vacuum reservoir and the evap canister.
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post #11 of 13 Old 05-22-2009, 03:22 PM Thread Starter
funnynyck
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Here is the pic: What this bottle is? EVAP canister or the vacuum reservoir?



Note that one of the inlet/outlet is not connected / not capped.
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post #12 of 13 Old 05-22-2009, 07:16 PM
Saudade
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Yep, that's the evaporative canister for the emissions. The vacuum reservoir is behind the pass side front bumper. At least, it is on a LHD vehicle.
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post #13 of 13 Old 07-06-2009, 09:28 PM
audiemurphy
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Did you guys ever figure out what was going on with your jeeps? I have pretty much the same problems, 5 second start up, rough idle at first, a/c going to defrost while climbing a hill, but without the backfire. I am trying to figure out how to perform a vacuum test on this and any help would be appreciated.

I was thinking it was my fuel pump since its reading 36psi until i saw this thread.

96 xj country.

96 Cherokee country, 4.0l inline 6.
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