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Old 05-16-2007, 06:44 PM   #1
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Vacuum line to nowhere

found where a vacuum line went, and can't find any loose. It's located towards the front of the engine on the side of the intake manifold. any ideas? (2000 - 4.0 - sport)

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Old 05-16-2007, 06:46 PM   #2
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I think that one goes to the evap system.

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Old 05-16-2007, 06:49 PM   #3
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Old 05-16-2007, 06:53 PM   #4
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I still have that black wire cover? in the way of mine, but all I saw were the 2 next to it. One goes to that black box all the way to the right in your picture (some kinda of MAF sensor?) and the other goes up to the firewall and splits.

Dont see another nipple, but like I said, my jeeps normal and I can only find two. I certainly cannot find the third nipple on my Jeep. Is that a good thing?

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Old 05-16-2007, 07:30 PM   #5
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The red and blue go to the evap system one to the sensor the other to the leak detection pump.The green goes to the firewall and is for the HVAC system.

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4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 05-16-2007, 08:00 PM   #6
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by the pic, it seems I'm missing all in the blue lines. What you see in my original photo above is all that is next to the black box (which has one vac line connected to it)....what am I missing?.....how important is it?......and what do I do with the vac leak until I get the rest of it......remember your dealing with a noob here...
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Old 05-16-2007, 08:03 PM   #7
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Thats the leak detection pump.This is for emissions.Did they move it on your year?
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4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 05-16-2007, 08:06 PM   #8
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I think you are missing it you should look into this.Sombody else will know.
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4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 05-16-2007, 08:18 PM   #9
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...

here's a photo of what I have, or don't have


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Old 05-16-2007, 08:21 PM   #10
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you can tell it's missing because the top hole on the black box is plugged.
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4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 05-16-2007, 08:31 PM   #11
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is it one unit?......or seperate parts?.....and cost?
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Old 05-16-2007, 08:34 PM   #12
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just ran to mine and check it out... mine is plugged... here is a piky i just made..

gotta add.. I dont have that box in the blue from above..
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Old 05-16-2007, 08:37 PM   #13
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Thats weird why would a 99 have the pump and 2000 not have it?
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4.0/np231/ax15/d30/d35
flowmaster40,hpd30 with aussie locker,currie upper joints,4.88's, lca skids,chromo shafts,vanco brakes,d35 with super 35 and arb locker,re 4.5" springs,currie arms,re front uppers,Re shocks in back,walkerevens shocks up front, Re track bars with currie jj joints,anti rock,ss brake lines,re rear sway bar links,jks 1.25" bl and mml,bfg 35x12.5 km2's,craiger soft 8's,ome steering stabilizer,currie hd steering,rockmen front bumper,emp tank skid,lots more too.
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Old 05-16-2007, 08:40 PM   #14
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looks like mine should have had it........but don't
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Old 05-16-2007, 08:41 PM   #15
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maybe they designed something that takes its place? the pic i saw above i'm like wtf is that thing since i dont remember seeing it on my red.

Theoldone whats your idle speed with it open?
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Old 05-16-2007, 09:40 PM   #16
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havnt checked the rpm, but a pretty good drop, and seems to idle smoother with it closed. havn't tried driving it with it closed to check preformance closed either.......don't know if I should plug it or leave it open.....runs fine like it is....I'll try the other way tomorrow eve...... I know it has enough suction to just about pull your finger in it.....
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Old 05-16-2007, 09:50 PM   #17
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You need to plug it at least untill you figure it out. Vac leaks are not good.
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Old 05-16-2007, 09:56 PM   #18
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mines is just like yours and the only difference i visually see is the color.. Mine is pluged..it's not suppose to be open just like that i'm guessing the old one slipped of on accident while wiping the intake manifold. Junk can get in/through there. If you want to live it open i'd at least recomend putting a little filter on there..
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Old 05-16-2007, 10:32 PM   #19
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I'll try it completly plugged, then if performance is effected, I'll filter it.....still need to find out what it does, and/or if it needs to be replaced.
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Old 05-16-2007, 10:51 PM   #20
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I'm guessing its a manifold that they never bothered to redo.. its a plug for something extra but since the 00 model doesnt need that (so it seems) they just left it there and pluged it since it's cheaper to use the same old tamplets and also if a vacume source is needed that can be used since its free. It preatty much just has a hole that allows unmeasured and unfiltered air to enter the cylinders when its unpluged. I dont think it will affect much performance.. i believe idle will be the big affect because it allows unmeasured air to enter so it doenst add the fuel.. maybe i'll do that to mine too so it lower the fuel going to the engine at idle.
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Old 05-17-2007, 06:14 PM   #21
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no doubt, it lowers the idle to a smoothes it out.
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Old 05-17-2007, 07:18 PM   #22
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So it idles smoother with it pluged?
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Old 05-17-2007, 10:21 PM   #23
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THat looks like the EGR you don't need it unless you get tested for emmisions. I took it off of my Mustang and I took all that stuff off my Trans Am. I don't know why anyone would take it off of a Jeep though I can't see where that will help performance without a tune and what not. I would just plug the whole in the manifold with a bolt. I believe the EGR is just to measure exhaust, its the Exhaust Gas Recirculation system to help cut back on emmisions. You should find out if someone has a tune on it if not you need a programmer to turn it off. I found this link for you:
http://autorepair.about.com/od/gener...l/bldef165.htm
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Old 05-17-2007, 10:23 PM   #24
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If you don't have a check engine light then it is probably turned of or the bulb has been removed.
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Old 05-17-2007, 10:39 PM   #25
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Quote:
Originally Posted by Mike001 View Post
If you don't have a check engine light then it is probably turned of or the bulb has been removed.
I dont have one either.. no check engine light..
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Old 05-17-2007, 10:46 PM   #26
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First off, when you first turn the key on, You will get a "bulb check" and the Check engine light will illuminate for a second or 2. As for the location of the emissions components, 99,00 and 01 they were placed in different locations. For your hose routing, look up on the hood for a vac line diagram. It will tell you what should be where and what should be plugged. I am going to say that on a 00, I believe that it was just a plug for that spot you are missing.

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Old 05-17-2007, 10:48 PM   #27
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So that year model didn't have an EGR or it was just located somewhere else? THey are useless IMO any they're pretty pointless on my sports cars so I remove them anyway. No problems but I can't see why a Jeep wouldn't have it unless its pretty modified and emmsions would be crappy anyway.
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Old 05-17-2007, 10:58 PM   #28
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Hey you could put a hose on it and run Seafoam through it....
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Old 05-17-2007, 11:22 PM   #29
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Quote:
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No problems but I can't see why a Jeep wouldn't have it unless its pretty modified and emmsions would be crappy anyway.
The jeep is way above average for crappy emmisions.. it barely passes.. if 10 is fail and 0 is perfect jeep is an 8.. how do i know? I once spent couple of hours at my jeep dealer waiting for them to replace my fuel pump so i just walked around the dealer lookin at other junk.
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Old 05-17-2007, 11:26 PM   #30
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Yeah but if they are already that shitty then why would they come without an EGR? I'm pretty sure thats what that is.

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