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Unread 10-16-2013, 02:47 AM   #1
chuck172
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1993 YJ Wrangler 
 
Join Date: Mar 2012
Location: Newton, New Jersey
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Vacuum Reservoir

Did all YJ's come with the Vacuum Reservoir under the battery?
I don't believe I have one.

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Unread 10-16-2013, 04:41 AM   #2
superj
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yes. mine is not hooked up anymore though
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Unread 10-16-2013, 06:46 AM   #3
SeanB95YJ
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are you confusing a vacuum reservoir with the charcoal (evap) canister maybe?
look on your firewall on the driver side way under the brake booster... that's where my charcoal can is (95)
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Unread 10-16-2013, 07:05 AM   #4
superj
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no, there is one for the 4x4 system under hte battery
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Unread 10-16-2013, 07:08 AM   #5
vadslram
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Mine looks like a black softball with a vacum hose going to it. Next to the charcoal canister.
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Unread 10-16-2013, 07:10 AM   #6
superj
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hmm, maybe since ya'lls are newer they are on the driver's side. mine is the softball looking one also but on the other side of the bay
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Unread 10-16-2013, 09:10 AM   #7
chuck172
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I'm not talking about the charcoal canister, the vaccum reservoir. I understand it's located right below the battery. I don't think I have one.
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Unread 10-16-2013, 09:19 AM   #8
tom_sprecher
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1991 YJ Wrangler 
 
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Judging by the profiles, maybe the newer models (91 and up) do not have vacuum reservoirs. Mine does not.
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Unread 10-16-2013, 10:09 AM   #9
superj
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you know what, thinking back to my wife's 93 yj, hers didn't have one under the battery tray. i had to rerun all her 4x4 vacuum lines and they went straight from the t-case switch to the front axle, not to a reservoir like my 87 has
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Unread 10-16-2013, 11:10 AM   #10
vadslram
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Although the reservior isn't essential for it to run it does make things like the heat and 4wd work with less glitches.
If you already did a manual disco and don't mind if the heat shifts around at WOT then by all means get rid of it.
But they weigh like a pound, have no moving parts and you can use ANY vehicle make and model in the jeep. It's just a big airtight empty. TJs and ZJs have a flat one you can get at Morris's for less than $30 brand new.
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Unread 10-20-2013, 06:22 AM   #11
chuck172
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How bout this, does anyone with a newer yj (92-95) have a Vacuum Reservoir?
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Unread 10-20-2013, 12:14 PM   #12
djfred
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I have a 92 and mines empty under the battery.
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Unread 10-20-2013, 04:37 PM   #13
bpounds
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Most vehicles will have a vacuum resevoir. Even diesels that have an electric motor to create vacuum will have one.

As mentioned, the resevoir makes all the vacuum operated devices work more efficiently. It also prevents a massive loss of vacuum in the motor when you turn something on that uses vacuum. Without the resevoir, your engine would run rich for a moment, essentially the equivalent of a vacuum leak. Think of your brake booster for example, which uses a lot of vacuum when you press the service brake.
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Unread 10-20-2013, 06:08 PM   #14
fishadventure
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I thought that only one fresh air heater 'door' was vac operated; the rest are cable run. I was not planning on using any vac lines on my '91 as the front axle is going to be a cable posi-lock. Please tell me more...
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Unread 10-20-2013, 07:39 PM   #15
jay-h
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You can get general purpose ones, you don't have to find the original.

http://www.summitracing.com/search/p...uum-reservoirs
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