Crankcase Ventilation Question / "Mystry Hole"
#1
Member
Thread Starter
Join Date: Oct 2009
Location: New York, USA
Posts: 244
Likes: 0
Received 2 Likes
on
2 Posts
Year: 1996
Model: Cherokee
Engine: 4.0L I6
Crankcase Ventilation Question / "Mystry Hole"
Hi guys.
First of all let me just say BIG THANK YOU to all for this great forum, as I already found a bunch of good info here.
I'am about couple week old Jeep Cherokee owner , as I just traded my '96 VW golf (90k) for '96 Cherokee Sport (205K!) hehe heh and was spending all the time I could to fix what ever I can handle myself on my driveway. Bunch of things fixed (the "biggest" thing for me was radiator replacement ... messy).
Now, guys, I 've ran into somewhat "mystery" situation. Maybe for somebody here it's no mystery at all, so I hope someone can give me a tip on how to approach this "situation".
First I have to mention, that I've got the Jeep from a student, who owned it for less than a year and he does not really know the history of the machine, so I have no way to find out what and when was done to it.
Here's the situation.
I've discovered that the PO have cut a small hole in the CCV tube. I was trying to search the web to find any info on why this would be done and failed to find anything.
So my first question is: Do you have any idea what the PO was trying to accomplish this way?
Now, when the engine runs and I put my finger against that hole - it sucks the air. So it sort of mixing the "mixture" from the CC with "not so fresh" air from under the hood. hmmmmm????
OK, now, as I started "investigating" more, and when I disconnected the hose from orifice I see pretty "good" amount of oil in it (and there is some inside the hose also. SO. IS IT NORMAL to have oil there? I thought that it should be clean inside?
If the oil inside is a problem, guys, what my next step should be? Should I get new parts or maybe I can clean it up, cover the hole in the hose?
I was trying to remove the orifice but it sits there pretty tight. I was worring about not to break it. How do you remove it from the cover? Do I need to use a tool or just force it a bit harder?
Any advice or an idea will be appreciated.
I am attaching the photos to demonstrate all this.
There is overall view, then the hole in the hose pointed with the red pointer, then there's close up shot of the hole in the hose and then there's the close up photo of oil inside the orifice after I disconnected the hose.
Thanks in advance, guys. You rock!
First of all let me just say BIG THANK YOU to all for this great forum, as I already found a bunch of good info here.
I'am about couple week old Jeep Cherokee owner , as I just traded my '96 VW golf (90k) for '96 Cherokee Sport (205K!) hehe heh and was spending all the time I could to fix what ever I can handle myself on my driveway. Bunch of things fixed (the "biggest" thing for me was radiator replacement ... messy).
Now, guys, I 've ran into somewhat "mystery" situation. Maybe for somebody here it's no mystery at all, so I hope someone can give me a tip on how to approach this "situation".
First I have to mention, that I've got the Jeep from a student, who owned it for less than a year and he does not really know the history of the machine, so I have no way to find out what and when was done to it.
Here's the situation.
I've discovered that the PO have cut a small hole in the CCV tube. I was trying to search the web to find any info on why this would be done and failed to find anything.
So my first question is: Do you have any idea what the PO was trying to accomplish this way?
Now, when the engine runs and I put my finger against that hole - it sucks the air. So it sort of mixing the "mixture" from the CC with "not so fresh" air from under the hood. hmmmmm????
OK, now, as I started "investigating" more, and when I disconnected the hose from orifice I see pretty "good" amount of oil in it (and there is some inside the hose also. SO. IS IT NORMAL to have oil there? I thought that it should be clean inside?
If the oil inside is a problem, guys, what my next step should be? Should I get new parts or maybe I can clean it up, cover the hole in the hose?
I was trying to remove the orifice but it sits there pretty tight. I was worring about not to break it. How do you remove it from the cover? Do I need to use a tool or just force it a bit harder?
Any advice or an idea will be appreciated.
I am attaching the photos to demonstrate all this.
There is overall view, then the hole in the hose pointed with the red pointer, then there's close up shot of the hole in the hose and then there's the close up photo of oil inside the orifice after I disconnected the hose.
Thanks in advance, guys. You rock!
#2
CF Veteran
Join Date: Feb 2009
Location: Houston Tx.
Posts: 2,203
Likes: 0
Received 3 Likes
on
3 Posts
Year: 1995
Model: Cherokee
Engine: 4.0
Maybe they did the hole to let some hot air escape/ let some cooler in, before it makes it's way back into the engine.
and why is everyone's exhaust manifold so clean when mine's covered in a layer of oil
and why is everyone's exhaust manifold so clean when mine's covered in a layer of oil
#3
Seasoned Member
Join Date: Oct 2009
Location: Douglassville/Altoona, Pa
Posts: 381
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1996
Model: Cherokee
Engine: 4.0 HO
#4
Member
Thread Starter
Join Date: Oct 2009
Location: New York, USA
Posts: 244
Likes: 0
Received 2 Likes
on
2 Posts
Year: 1996
Model: Cherokee
Engine: 4.0L I6
heh heh, yeah, guys, I know, it may be a bit "too clean" out there ..lol, that's because I've spent couple day cleaning the hell under the hood.
It was all covered with pretty nice layer of solid "protective coat" ...
First I kind of like thigs clean, but the more serious reason, was as I had to try to see what's going on, check things around while learing what and where - I kind of like to see colors, and so I see parts , condition etc ..hah hah, not all the same uniformed. Also there were few rusty spots inside, had to fix it etc. There was oil all over mixed with coolant: oil pressure sender was leaking/and dead, heater valve was leaking, radiator leaking on both sides ... it was not so pretty
anyhow,
thanks for the thoughts.
I actually asked about this couple guys at outoparts (at Napa and Advanced AParts) , the guys were pretty helpful in the past. But neither really gave me any "clear" answer about my CCV situation. One guy thought that this may be ment to lead to more "air", more fuel burn and "more power" ...hmmmmm...I wish I undestand this stuff ... , I don't know.
My biggest worry now - the oil inside the hose????
Also I don't like the idea of unfiltered air getting sucked in. So what ever this "mod" was for I don't want the "benifits" of such
But I was thinking, maybe there is something else to it, that I just don't know.
I would hate buying new parts from dealer for this. I hope that I can fix it up. But if there no way around it, then I'd rather buy new parts and install them.
The thing is, that the Jeep runs fine. I wonder how critical is it to have CCV system in "perfect shape".
thanks again, guys
It was all covered with pretty nice layer of solid "protective coat" ...
First I kind of like thigs clean, but the more serious reason, was as I had to try to see what's going on, check things around while learing what and where - I kind of like to see colors, and so I see parts , condition etc ..hah hah, not all the same uniformed. Also there were few rusty spots inside, had to fix it etc. There was oil all over mixed with coolant: oil pressure sender was leaking/and dead, heater valve was leaking, radiator leaking on both sides ... it was not so pretty
anyhow,
thanks for the thoughts.
I actually asked about this couple guys at outoparts (at Napa and Advanced AParts) , the guys were pretty helpful in the past. But neither really gave me any "clear" answer about my CCV situation. One guy thought that this may be ment to lead to more "air", more fuel burn and "more power" ...hmmmmm...I wish I undestand this stuff ... , I don't know.
My biggest worry now - the oil inside the hose????
Also I don't like the idea of unfiltered air getting sucked in. So what ever this "mod" was for I don't want the "benifits" of such
But I was thinking, maybe there is something else to it, that I just don't know.
I would hate buying new parts from dealer for this. I hope that I can fix it up. But if there no way around it, then I'd rather buy new parts and install them.
The thing is, that the Jeep runs fine. I wonder how critical is it to have CCV system in "perfect shape".
thanks again, guys
#5
Seasoned Member
Join Date: Oct 2009
Location: Douglassville/Altoona, Pa
Posts: 381
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1996
Model: Cherokee
Engine: 4.0 HO
Yeah thats odd for sure. If you want you could just go to a junkyard and get one from another XJ for probably like 2 dollars
#6
Member
Thread Starter
Join Date: Oct 2009
Location: New York, USA
Posts: 244
Likes: 0
Received 2 Likes
on
2 Posts
Year: 1996
Model: Cherokee
Engine: 4.0L I6
It's raining non stop here. Screwed all my plans for weekend, while I was also fixing some rusty spots around the windshield.
#7
Seasoned Member
Join Date: Sep 2009
Location: East Texas
Posts: 454
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1997
Model: Grand Cherokee
Engine: 4.0
The CCV serves the same function as a PVC. The system has a an orifice that meters the engine vapors. The tube connects intake vacuum to the valve cover. When the engine runs, intake air draws out the vapor and mixes with it and it all gets burnt by the engine.
The reason you see lots of oil on the CCV is that it is not getting any vacuum. The intake is sucking in air at the hole. So the CCV is just static.
You are getting unfiltered air in the engine.
Check to make sure the CCV is clear. Replace the tube or seal the hole. The CCV is very tight in that hole.
The reason you see lots of oil on the CCV is that it is not getting any vacuum. The intake is sucking in air at the hole. So the CCV is just static.
You are getting unfiltered air in the engine.
Check to make sure the CCV is clear. Replace the tube or seal the hole. The CCV is very tight in that hole.
Trending Topics
#8
CF Veteran
Join Date: Sep 2009
Location: NC
Posts: 5,376
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
Just curious what is the hose in the middle picture back towards the firewall with the little tiny white cap on it?
Mine has that too and I followed the hose and it is pretty well banged up and has lots of what looks like rub wear.
Mine has that too and I followed the hose and it is pretty well banged up and has lots of what looks like rub wear.
#9
You can follow it all the way down to your diff thats the vent tube. If there are any holes and you wheel it at all Id replace it. It keeps water and mud out of the diff
#10
CF Veteran
Join Date: Jul 2008
Location: Schnecksville, PA
Posts: 1,217
Likes: 0
Received 5 Likes
on
5 Posts
Year: 94 XJ
Model: Cherokee
Engine: 4.0L
The CCV is just like a PCV, like said before.
The only difference is a PCV has a plunger valve.
You will need to seal up that hole.
Unfiltered (dirty) air is making its way into the cylinders.
Most times if the CCV or associated parts get clogged, you will find a fair amount of oil in your air filter.
Check out: https://www.cherokeeforum.com/f2/oil-breather-26570/
The only difference is a PCV has a plunger valve.
You will need to seal up that hole.
Unfiltered (dirty) air is making its way into the cylinders.
Most times if the CCV or associated parts get clogged, you will find a fair amount of oil in your air filter.
Check out: https://www.cherokeeforum.com/f2/oil-breather-26570/
#11
Member
Thread Starter
Join Date: Oct 2009
Location: New York, USA
Posts: 244
Likes: 0
Received 2 Likes
on
2 Posts
Year: 1996
Model: Cherokee
Engine: 4.0L I6
ok, great, guys, thank you for your input. really appreciated. You know, It sucks to deal with things that I have no clue about alone ....
So, in this miserable weather, I went out, took the tube out, cleaned it up inside and out. Then I've placed a cut of plastic tube over the hole (to provide non-sticky surface in the hole location inside) and I sealed it with tape tight.
I still failed to remove the damn orifice. It turns around very freely but I can't unplug it. Maybe I 'll look at it from inside when ever I get into removing the cover...maybe.
I should of mention that I've got Haynes manual, it has a section about CCV, but not much there, and of course no notes on "a hole in the hose"
Also, I've checked the air supply tube, it's looks all fine, no oil there, no oil on air filter either.
BTW, thanks for mentioning that white cap tube, I also was wondering what is this thing for when I first time saw it, than I forgot about it, while dealing with "issues".
thanks again, guys
So, in this miserable weather, I went out, took the tube out, cleaned it up inside and out. Then I've placed a cut of plastic tube over the hole (to provide non-sticky surface in the hole location inside) and I sealed it with tape tight.
I still failed to remove the damn orifice. It turns around very freely but I can't unplug it. Maybe I 'll look at it from inside when ever I get into removing the cover...maybe.
I should of mention that I've got Haynes manual, it has a section about CCV, but not much there, and of course no notes on "a hole in the hose"
Also, I've checked the air supply tube, it's looks all fine, no oil there, no oil on air filter either.
BTW, thanks for mentioning that white cap tube, I also was wondering what is this thing for when I first time saw it, than I forgot about it, while dealing with "issues".
thanks again, guys
Last edited by Dr ZEE; 10-18-2009 at 02:39 PM.
#12
Member
Join Date: Sep 2009
Posts: 239
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1985
Model: Cherokee
Engine: 2.5 liter
#13
Member
Thread Starter
Join Date: Oct 2009
Location: New York, USA
Posts: 244
Likes: 0
Received 2 Likes
on
2 Posts
Year: 1996
Model: Cherokee
Engine: 4.0L I6
Wait! It's even worse. Think of this! I was an original owner of the Golf. And I babied it for most of its life and I really LOVED that thing, untill some day I sort of lost all the passion about it completely, to quote B.B.King - "
I just kind of got tired of it and bored with it and I guess at this point of life, I don't "feel cool" with "golfy" ...heh heh
Also since I've got a taste of driving GMC sierra I really started feeling "too small" in the golf. Also , if you know VW of around 96, you know that they have so much crap going on. It runs fine for the most, but issues are all over.
Also, this jeep (as was my golf) in my situation is my "secong moving device", as I drive the truck. Also I don't travel much anymore, I kind of becomming more like a "local dude". But I like the idea about not worring too much about roads condition with jeep.
Anyhow, it kind of "questionable" trade for sure, but in my situation it was just what I wanted, sort of. I guess I could try to sell the golf first for a bit more cash and then trying to find a jeep with lower miles...but it takes time, effort and you never know anyway at the end.
#14
Member
Join Date: Sep 2009
Posts: 239
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1985
Model: Cherokee
Engine: 2.5 liter
hah hah
Wait! It's even worse. Think of this! I was an original owner of the Golf. And I babied it for most of its life and I really LOVED that thing, untill some day I sort of lost all the passion about it completely, to quote B.B.King - "The Thrill Is Gone, Baby" ...heh heh.
I just kind of got tired of it and bored with it and I guess at this point of life, I don't "feel cool" with "golfy" ...heh heh
Also since I've got a taste of driving GMC sierra I really started feeling "too small" in the golf. Also , if you know VW of around 96, you know that they have so much crap going on. It runs fine for the most, but issues are all over.
Also, this jeep (as was my golf) in my situation is my "secong moving device", as I drive the truck. Also I don't travel much anymore, I kind of becomming more like a "local dude". But I like the idea about not worring too much about roads condition with jeep.
Anyhow, it kind of "questionable" trade for sure, but in my situation it was just what I wanted, sort of. I guess I could try to sell the golf first for a bit more cash and then trying to find a jeep with lower miles...but it takes time, effort and you never know anyway at the end.
Wait! It's even worse. Think of this! I was an original owner of the Golf. And I babied it for most of its life and I really LOVED that thing, untill some day I sort of lost all the passion about it completely, to quote B.B.King - "The Thrill Is Gone, Baby" ...heh heh.
I just kind of got tired of it and bored with it and I guess at this point of life, I don't "feel cool" with "golfy" ...heh heh
Also since I've got a taste of driving GMC sierra I really started feeling "too small" in the golf. Also , if you know VW of around 96, you know that they have so much crap going on. It runs fine for the most, but issues are all over.
Also, this jeep (as was my golf) in my situation is my "secong moving device", as I drive the truck. Also I don't travel much anymore, I kind of becomming more like a "local dude". But I like the idea about not worring too much about roads condition with jeep.
Anyhow, it kind of "questionable" trade for sure, but in my situation it was just what I wanted, sort of. I guess I could try to sell the golf first for a bit more cash and then trying to find a jeep with lower miles...but it takes time, effort and you never know anyway at the end.
thats why i kept it, saved up and bought a jeep for the road conditions.
cuase god knows a lowered turbocharged jetta with the intake one inch off the ground and sittin on lowpros runnin 14 lb booost is NOT a snow or rain or even winter vehicle at all...thats where my jeep takes up the slack... plus i can abuse it a little and not feel bad
#15
CF Veteran
Join Date: Sep 2009
Location: NC
Posts: 5,376
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee