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Old 10-20-2011, 03:40 PM   #1
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Default Where do these Vacuum Lines Go?

I picked up a '89 Cherokee with a 4.0 and 5-speed for my sister-in-law last week for $700. The Jeep is a base model with rubber floor mats and no A/C. The thing runs, drives and stops. I've been poking around the engine compartment and have already repaired a couple broken vacuum lines (it's running even better now than when we brought it home), using vacuum line diagrams I found on the forum, but I can't identify where the two lines in the photo below are supposed to go.

One line is red with a female connector and the line originates from the firewall (I suspect it has something to do with the ventalation controls.

The other line is blue with a male connector and some kind of a regulatory fitting. The line originates from a bundle of vacuum lines in the engine compartment.

My first instinct is to simply attach the two lines but since they are two different colors I'm worried about connecting them with out hearing from some other forum members first.

Thanks.
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Last edited by Mmurdock; 10-20-2011 at 07:02 PM. Reason: Had the year of the Jeep incorrect.
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Old 10-20-2011, 03:52 PM   #2
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Not 100% but the red might be for heater control valve and I believe the blue should go to the vacuum ball in the front bumper
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Old 10-20-2011, 03:57 PM   #3
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Later model XJ's eliminated the Heater Control Valve. This is quite the mystery...

Click the image to open in full size.
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Old 10-20-2011, 04:00 PM   #4
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That pic is of a renix engine compartment, not a 98...
The blue one is supposed to be like that, the disk thing is a vent/check valve.
The other one, Im not sure, but Ill check mine.
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Old 10-20-2011, 04:08 PM   #5
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Oops... dislexia got the best of me. It's an '89 not a '98. Sorry for any confusion. I just corrected it in the first post.

What is "renix"? I've come across this term several times on the forum and I don't have a clue what it means.

Also, this Jeep has 201,000 miles on it, so it's possible the engine was swapped sometime in the past.

Last edited by Mmurdock; 10-20-2011 at 07:03 PM.
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Old 10-20-2011, 04:11 PM   #6
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"Renix" engines were drum 87-90 I believe, and in likelihood you have the same engine that came in it from the factory. There are TONS of us on here with more than that, my 93 has 227,300 on it
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Old 10-20-2011, 04:14 PM   #7
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My old 89 had 212 and a bad knock (was like that for a LONG time), my 97 had 278, my girlfriends 96 has 240, and my new 89 has 237...

That other one looks like it goes to the vacuum canister. Keep looking around, youll pry find a black line not hooked up to anything that goes towards the bumper/front of engine compartment.

Ill find my renix paragraph in a minute... lol
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Old 10-20-2011, 04:29 PM   #8
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if i recall the blue is a vent and the purple hooks to heater control valvehttp://jeep.zerok.ru/index.php?page=24
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Old 10-20-2011, 04:37 PM   #9
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looks like other one goes to heater control valve...
Click the image to open in full size.
See it make a loop from "heater core" to "heater control valve"

Found my paragraph on renix:
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Originally Posted by Defiance665
The renix ecu was made by renault/bendix, both of which are well known in the aeronautics industry

renix is Pre-obd and therefore does not "throw codes"

Renix jeeps have one oxygen sensor and a EGR valve (91+ does not have egr valve, and has at least 2 oxygen sensors)

Any "codes" are stored until the vehicle us shut off UNLESS they are a "hard" code, one that reoccurs and stays for more than 2 seconds.

There are no really available scanners for renix, and even if you found one they would not be very useful. The snap on one is l ike 2500$ last time I checked.

The renix system can be diagnosed with a multimeter and some time

Renix jeeps use a knock sensor, therefore they can advance timing until ping starts, and then slowly retard until it stops. This increases fuel mileage over the HO jeeps.

Long crank times are normal, usually 5-10 seconds. The engine has to reach 300rpm and find TDC at the no1 or no6 cyl before it will send spark and fuel.

Renix uses an adjustable TPS, HO are non adjustable

They also have a 25mph downshift when you are on the brakes, 91+ does not have this.
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Old 10-20-2011, 07:13 PM   #10
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Thanks, I'll get under the hood again and see if I can find where the go.
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Old 10-20-2011, 10:21 PM   #11
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Quote:
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"Renix" engines were drum 87-90 I believe, and in likelihood you have the same engine that came in it from the factory. There are TONS of us on here with more than that, my 93 has 227,300 on it
..........422,000 1990 5 speed 4.0, 2 door sport
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Old 10-20-2011, 11:51 PM   #12
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Quote:
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..........422,000 1990 5 speed 4.0, 2 door sport
Explains the username lol
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Old 10-21-2011, 10:00 AM   #13
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Good God, I can't believe the mileage you guys are putting on these things!

I had an '84 CJ which I owned for 10-years before trading for a Ford truck (big mistake). I had 136,000 on the stock carburated 4.2 before I pulled it and rebuilt the entire drive train. It was running fine but starting to smoke a little on hard acceleration, the T5 tranny was a little hard to shift into second, and the Dana 300 transfer case was still solid. What really surprised me when I tore it all down was when I compared the new clutch to the old one, there was hardly any wear. I belonged to a 4x4 club and regularly beat on the thing but it never left me stranded (I changed a lot of u-joints and wheel bearings though).

When I finished the rebuild, which included a hot cam, Webber carb, Jacobs electronic ignition, 6 into 2 tube headers with cat but no muffler, and a few other things I can no longer remember, I was able to smoke my 31 x 10.5 tires from a standing start. I really miss that Jeep...
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Old 10-22-2011, 10:42 PM   #14
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Quote:
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Explains the username lol
rounded up actually have 421,876
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Old 11-09-2011, 11:58 AM   #15
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I've been working and researching information about this XJ for a few weeks now. I've discovered why the red vacuum line is not connected to anything: It should go to the heater control valve but a PO removed it and replaced it with some random plumbing fittings. The heat works when it's turned on and the controls are switched to cool, cool air blows from vents (there's no AC on this XJ). I'm considering replacing the heater control valve in the future, but right now it doesn't seem to be a priority. I would like to know what I should do about the vacuum line. I don't know if it's in some way connected to the engine management vacuum system. Should I plug it or leave it unplugged? Currently I have it plugged.

I still have no idea what the blue line is for. A couple forum members felt it should be connected to the vacuum ball behind the front bumper, but there is a black line already connected to it. This black line also originates from the same location in the firewall as the red and blue line. There is no sign of a second vacuum line between the firewall and vacuum ball. While I was at the wrecking yard I took a look at another '89 4.0 XJ but it did not have blue vacuum line. Two other XJ's I looked at didn't have it either. Any other suggestions on what to do with the blue line?

On a similar subject, I spent an hour or so yesterday trying to get the blower for the climate control system working again. There is a melted crater where the blower fuse used to go. After the meltdown a PO cut the purple and yellow blower wire at the back of the fuse block, made a fused jumper wire and plugged it into the empty IGN slot in the fuse block. Upon inspection of the climate controls in the dash I also found the PO had also removed insulation from the blue wire of the blower switch, then made another jumper wire which is plugged into the ACC slot of the fuse block. This was some fine electrical work since the hot 12v jumper wire was simply twisted around blower switch wire (please see the photo). I tested the blue blower switch wire and there is no power to it, so I cleaned things up, soldered the blue jumper wire to it, wrapped it with electrical tape and now the blower fan works again. I took the XJ on a drive with the fan on high to see if there would be any problems with the wiring. When I got back I checked the wires, the blue jumper was fine, but the first jumper for the purple and yellow blower fuse wire was warm. I suspect I have bypassed some part of the blower’s electrical system which failed but I don’t know what. The blower is working right now but if possible I’d like to get this thing wired correctly. Any suggestions would be most appreciated.
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