alright - I now have cleared up the confusion regarding PCV/CCV: The front one that connects to the air cleaner box, is hollow, and the other one that connects to the intake plenum, is also hollow, but with one difference.. the rear valve has an orifice (a small 1/8 hole as you said) to help stop oil splatter from getting up into the elbow. While the engine is running, air is vented and pulled from the completely hollow elbow (ccv), which draws from the air cleaner box, through the engine valve cover and out through the (pcv), which pulls the engine blow by into the intake plenum, via the vacuum pressure pulling the air through. So CCV is located at the front of the valve cover, PCV at the rear.
if you wanna get even nerdier about it, the 4.0 doesn't actually have a PCV at all, but uses a CCV system (PCV/CCV are the types of systems, not the valves themselves) In this case, the 4.0 vent system is driven by negative pressure/vaccum - as the intake manifold generates a vacuum, it "pulls" on the rear tube (the metered one with a smaller hole) which pulls out the gasses in the case (and thus pulls air thru the front breather) In the 5.2, the pressure is generated "positively" as it builds up in the case and "pushes" the vapor out thru a check valve (instead of a vaccum "pulling" the vapor) The annoying part of all this is that "positive" pressure and "negative" pressure are the same thing from different directions - a positive "pushing" pressure creates a negative "pulling" (aka a vaccum) one behind it - if air is flowing around in a loop, is it going "in" or "out"? Gotta love semantics! If you're looking at this and thinking "why not just call all of these the same thing - a case venting system" you're not wrong
@@theecube1 yep, its a continuous crankcase ventilation system, pioneered by jeep since they started. but its easier to use mechanic terms and just call it "the fuckin crank vent shit"
One of my mecanics told me to replace the whole valve cover just to fix this issue... Thanks a bunch ! The 91-93 and 96-04 models vary and finding the 91' elbow was a pain.
Actually the Jeep don’t have a pcv, a pcv is sprint operated, like a check valve, the Jeep has a ccv, closed crankcase ventilation, it is simply a hole.
PCV is the correct terminology baked stuffing with excellent and it's not replace or the hoses are cracked it will make your car misfire and run rough excellent video
I’m about to do these when they come in the mail. But my hoses are shot too. If anyone else needs their hoses replaced too I got a full kit from Team Cherokee, only place I could find them
TyMan713 same thing happened to me. If you’re talking about the hose that goes from the valve cover to the intake manifold then this is the one I got to replace it with: www.partsgeek.com/catalog/2001/jeep/cherokee/air_intake/breather_hose.html The 97-01 should all be the same
....nice and helpful video ! I have a 1998 4.0 and am going to remove the valve cover and the valves/grommets as well. There's always confusion if PCV or CCV valves installed front/back. Do the valves just have different sizes in the openings or are these different types of valves ? Any part number available ? Thanks !
Thanks for watching! To my knowledge, the only difference between the front and rear is the size of the opening. I have links to both valves and grommets in the description of the video. Also I have a video about removing the valve cover if you wanna check it out as well: th-cam.com/video/qbEopqYsSG8/w-d-xo.html
It’s a CCV valve. The parts place is called a PCV valve. The maintenance book that you can get for $14.99 still after 15 or 16 years of the price! The Haynes manual says it is a CCV valve.
Hope you guys enjoyed this tutorial. I put links to the grommets and both valves in the description if you are looking to buy them. Thanks for watching!
I’m looking for the hose for the PCV rear Valve. Auto stores don’t have the matching hose for my 01 Cherokee 4x4 4.0 Do you know the proper terminology or part number for that hard hose
If we’re thinking of the same hose then that would be the crankcase breather hose, I had to replace mine as well because it completely snapped when I removed it. Mopar part number: W0133-1840007
i have a question about this. i noticed mine in the front was leaking so i replaced it. i let it run for 15 minutes or so, it stays dry. when i drive it, about 5 or so miles down the road i get a burnt oil smell. there's oil on the top of the valve cover. it seems to be either coming from the new pcv or where the hose is. i can't tell where it's coming from because it doesn't leak when i let it run without driving it. i replaced everything but seeing this video, could this be because i didn't replace the one in the back also?
It could be quite possible. Hard to say though if you can’t see it actually leaking but those are the only places it could come from if there is oil on top of the valve cover. That or the hoses maybe
@@KCars ok, i'll have to look into replacing that also. another question. the one on the back has the plastic tube like the front but it bolts into the intake. do you know if i can just put a hose there or if i'll need to try to save that tube? i can't really look into it right now because of rain.
@@timduncan4950 sounds good. I replaced that back tube that goes from the valve cover to the intake manifold with a brand new OEM one and it was super easy, just need to wiggle it around a little to get it off
Not sure of the exact size but I replaced mine with an OEM replacement tube. This might be what you’re looking for: 4854265 Crankcase Vent Tube To Intake Manifold ，Crankcase Ventilation Tube Hose for 1997-2004 Jeep Wrangler TJ 4.0L, 1996-2001 Jeep Grand Cherokee XJ 4.0L 04854265 a.co/d/gHIjX8i
@@KCars thanks I’ve been trying to find it. Mine is a 92. I will probably call the dealership Tomorrow and see what they got. Grew up with an old wagoner, had an awesome blue like yours in an 86 manual, a dark cherry 1990 Pioneer and now found this 1992 Laredo.
Angel F I don’t think a new PCV valve would fix a problem like that, it could be a number of different things but the PCV valve likely isn’t major enough to be causing a problem like that
If you’re referring to the size of the hole then yes it does matter. The one with the larger hole goes in the front and the one with the smaller hole goes in the rear
Genuine Chrysler 4854265 Crankcase Vent to Intake Tube www.amazon.com/dp/B007NO3XD2/ref=cm_sw_r_cp_api_glt_fabc_SGBBN3HT548384ZR5R73?_encoding=UTF8&psc=1
@@KCars Sweet thanks, man. I actually just purchased the boots attached to the end. I'm having low idle issues (500 rpm at stop) and am hoping replacing the valves, grommets, and boots will help. Dorman 47128
I think that only works on a 91-93 Valve Cover. Those years PCV/CCV Valves don't have separate grommets, they have a rubber seal that is attached directly to the PCV/CCV Valves and install/uninstall by rotating 90 degrees due to the slot in the hole in the Valve Cover. When you rotate it into the correct position it becomes tighter and makes the seal. On his 95 Valve Cover there is no Slot in that hole, it's just a hole that the Grommet presses into, and then the PCV/CCV Valves press into the Grommets.
Mine did as well. I ended up getting an OEM replacement for it: 4854265 Crankcase Vent Tube To Intake Manifold ，Crankcase Ventilation Tube Hose for 1997-2004 Jeep Wrangler TJ 4.0L, 1996-2001 Jeep Grand Cherokee XJ 4.0L 04854265 a.co/d/4X1HZjM
You have them swapped, the tall elbow is supposed to go in front, PCV. The FLAT elbow is the CCV elbow and that goes in the rear. In your video these were in the wrong place.
It;s not really about whether it's tall or short or black or grey, it's about the size of the hole underneath. His Black short one has a big hole underneath because it's hooked up to the Air Box or Air intake by a bigger hose. His rear one, the one that's hardest to reach nearest the firewall probably has the smaller hole as it should because the hose is immediately reduced down to a much smaller hose that is connected to the top of the Intake Manifold behind the throttle body. I have a shorter grey one that has the smaller hole, his shorter black one has the bigger hole. So in other words he did not have them swapped in the Video they were correct. Forget about what color they are or whether they are being called PCV or CCV and how tall or short they are and just pay attention to what they are supposed to do.
![ทุกครั้งที่หลับตา (Lucid Dream) - AYLA's [ Official MV ]](http://i.ytimg.com/vi/4i1OBAQyv58/mqdefault.jpg)
![Jeep Cherokee: CCV System & Valve Cover - How to Replace Elbow Grommets/ How it Works [‘96-’01 XJ]](/img/n.gif)
alright - I now have cleared up the confusion regarding PCV/CCV:
The front one that connects to the air cleaner box, is hollow, and the other one that connects to the intake plenum, is also hollow, but with one difference.. the rear valve has an orifice (a small 1/8 hole as you said) to help stop oil splatter from getting up into the elbow.
While the engine is running, air is vented and pulled from the completely hollow elbow (ccv), which draws from the air cleaner box, through the engine valve cover and out through the (pcv), which pulls the engine blow by into the intake plenum, via the vacuum pressure pulling the air through.
So CCV is located at the front of the valve cover, PCV at the rear.
Thanks for the clarification!
if you wanna get even nerdier about it, the 4.0 doesn't actually have a PCV at all, but uses a CCV system (PCV/CCV are the types of systems, not the valves themselves)
In this case, the 4.0 vent system is driven by negative pressure/vaccum - as the intake manifold generates a vacuum, it "pulls" on the rear tube (the metered one with a smaller hole) which pulls out the gasses in the case (and thus pulls air thru the front breather)
In the 5.2, the pressure is generated "positively" as it builds up in the case and "pushes" the vapor out thru a check valve (instead of a vaccum "pulling" the vapor)
The annoying part of all this is that "positive" pressure and "negative" pressure are the same thing from different directions - a positive "pushing" pressure creates a negative "pulling" (aka a vaccum) one behind it - if air is flowing around in a loop, is it going "in" or "out"? Gotta love semantics!
If you're looking at this and thinking "why not just call all of these the same thing - a case venting system" you're not wrong
@@theecube1 thanks, very cool and helpful information - dude !
@@theecube1 yep, its a continuous crankcase ventilation system, pioneered by jeep since they started. but its easier to use mechanic terms and just call it "the fuckin crank vent shit"
Thanks for that my friend!
What I like about this video is that you show how it REALLY is when we work on cars, lol.
Of course, gotta keep it real!
Front = PCV (wider mouth underneath / black)
Rear = CCV (tiny hole underneath / gray)
👌
One of my mecanics told me to replace the whole valve cover just to fix this issue... Thanks a bunch ! The 91-93 and 96-04 models vary and finding the 91' elbow was a pain.
Sn8k3 glad I could help, thanks for watching!
I'm currently searching for a 91 elbow...
Where did you find the elbow lol
Thank you for the tutorial as well as the part recommendations. Very thorough. Thank you.
Thanks for watching!
PCV(positive crankcase ventilating) is the one near the firewall, the other is just a vent
Good to know, I ended up replacing both of them
Actually the Jeep don’t have a pcv, a pcv is sprint operated, like a check valve, the Jeep has a ccv, closed crankcase ventilation, it is simply a hole.
That's a beautiful blue on your jeep
Thanks!
Project Dan H channel has a video on using a different rear wiper arm
I’ll have to check it out, thanks!
PCV is the correct terminology baked stuffing with excellent and it's not replace or the hoses are cracked it will make your car misfire and run rough excellent video
Thanks!
What the hell did you say?
Are you alright? 🥴
😂😂😂
I’m about to do these when they come in the mail. But my hoses are shot too. If anyone else needs their hoses replaced too I got a full kit from Team Cherokee, only place I could find them
Thanks!
Mind dropping a link?
Dylan Lucas no prob teamcherokee.com/breather-hose-set-4-liter-oem-cherokee-comanche-1991-1995/
Anyone know where to get the hoses for a 98 or will the ones for the 91-95 work? My rear hose completely snapped and I can’t find it anywhere
TyMan713 same thing happened to me. If you’re talking about the hose that goes from the valve cover to the intake manifold then this is the one I got to replace it with: www.partsgeek.com/catalog/2001/jeep/cherokee/air_intake/breather_hose.html
The 97-01 should all be the same
CCV. Continuous crankcase ventilation it was a system that was designed back in the old army jeep days so an engine could run underwater
Thank you!
....nice and helpful video ! I have a 1998 4.0 and am going to remove the valve cover and the valves/grommets as well. There's always confusion if PCV or CCV valves installed front/back.
Do the valves just have different sizes in the openings or are these different types of valves ?
Any part number available ? Thanks !
Thanks for watching! To my knowledge, the only difference between the front and rear is the size of the opening. I have links to both valves and grommets in the description of the video. Also I have a video about removing the valve cover if you wanna check it out as well: th-cam.com/video/qbEopqYsSG8/w-d-xo.html
It’s a CCV valve. The parts place is called a PCV valve. The maintenance book that you can get for $14.99 still after 15 or 16 years of the price! The Haynes manual says it is a CCV valve.
Thanks
Front hose connects to air filter, but what is name of the part that connects to other end of hose in back?
It goes from the valve cover to the intake manifold
Will these parts fit on the 1990 Cherokee ? I’m having a hard time don’t any of the parts such as grommets elbows and the lines
I’m not too familiar with the older ones unfortunately but if it’s the inline 6 then it might
PCV (positive crankcase ventilation) Valve.
Thanks
Hope you guys enjoyed this tutorial. I put links to the grommets and both valves in the description if you are looking to buy them. Thanks for watching!
So before I make my order the, both o-rings are the same size?
Yes
I’m looking for the hose for the PCV rear Valve. Auto stores don’t have the matching hose for my 01 Cherokee 4x4 4.0
Do you know the proper terminology or part number for that hard hose
If we’re thinking of the same hose then that would be the crankcase breather hose, I had to replace mine as well because it completely snapped when I removed it. Mopar part number: W0133-1840007
Man, I have a question what of them is the PCV? Please Would you tell me. Thank you.
PCV is in the front and has a wider opening
Do you believe there's any issue between change the pcv with the check gauges light?
No I wouldn’t think so. Do any of your gauges indicate an issue?
Any idea why AutoZone has NO idea what I'm talking about *crying* I asked for a PCV valve and grommet for my Jeep and he told me it didnt have one
I’d just get it on Amazon if they don’t have it
Same
Saludos y gracias por el vídeo ingeniero 👍🙋
Thanks for watching!
The front is a crankcase vent,the rear is a pcv valve under intake manifold vacuum
Thank you
Hola necesito arreglar y donde compro las piezas soy de Puerto Rico necesito ayuda no me prende y e compre la bomba de gas
No hablo espanol
Great vids. Fixin up my XJ
Thanks for watching!
PCV = positive crankcase vent
CCV = crankcase vent
Thanks!
i have a question about this. i noticed mine in the front was leaking so i replaced it. i let it run for 15 minutes or so, it stays dry. when i drive it, about 5 or so miles down the road i get a burnt oil smell. there's oil on the top of the valve cover. it seems to be either coming from the new pcv or where the hose is. i can't tell where it's coming from because it doesn't leak when i let it run without driving it. i replaced everything but seeing this video, could this be because i didn't replace the one in the back also?
It could be quite possible. Hard to say though if you can’t see it actually leaking but those are the only places it could come from if there is oil on top of the valve cover. That or the hoses maybe
@@KCars ok, i'll have to look into replacing that also. another question. the one on the back has the plastic tube like the front but it bolts into the intake. do you know if i can just put a hose there or if i'll need to try to save that tube? i can't really look into it right now because of rain.
@@timduncan4950 it shouldn’t be bolted in. It’s supposed to slide on and off
@@KCars ok, maybe it is. it's been raining too much today. hopefully i can look at it tomorrow.
@@timduncan4950 sounds good. I replaced that back tube that goes from the valve cover to the intake manifold with a brand new OEM one and it was super easy, just need to wiggle it around a little to get it off
I used this for reference thank you
Glad I could help, thanks for watching!
Thank you teacher.very good video.
Thanks for watching
What size of hose, as the back one cracked at the elbow.
Not sure of the exact size but I replaced mine with an OEM replacement tube. This might be what you’re looking for: 4854265 Crankcase Vent Tube To Intake Manifold ，Crankcase Ventilation Tube Hose for 1997-2004 Jeep Wrangler TJ 4.0L, 1996-2001 Jeep Grand Cherokee XJ 4.0L 04854265 a.co/d/gHIjX8i
@@KCars thanks I’ve been trying to find it. Mine is a 92. I will probably call the dealership Tomorrow and see what they got. Grew up with an old wagoner, had an awesome blue like yours in an 86 manual, a dark cherry 1990 Pioneer and now found this 1992 Laredo.
Sweet, it’s an addiction lol
Anyone ever come across the part number for the front elbow with the wide opening?
I put links in the description
Will this fix my 1998 Grand Cherokee Laredo it turns off but it won’t stay on
Angel F I don’t think a new PCV valve would fix a problem like that, it could be a number of different things but the PCV valve likely isn’t major enough to be causing a problem like that
Oops...Too late. Thx for the video.
Thanks for watching!
Does the size matter? I have the same size for both PCV valves. Smaller gray one
If you’re referring to the size of the hole then yes it does matter. The one with the larger hole goes in the front and the one with the smaller hole goes in the rear
@@KCars Ah shit, thanks!
Anyone know where I can get the hose that connects to the back valve?
Genuine Chrysler 4854265 Crankcase Vent to Intake Tube www.amazon.com/dp/B007NO3XD2/ref=cm_sw_r_cp_api_glt_fabc_SGBBN3HT548384ZR5R73?_encoding=UTF8&psc=1
@@KCars Sweet thanks, man. I actually just purchased the boots attached to the end. I'm having low idle issues (500 rpm at stop) and am hoping replacing the valves, grommets, and boots will help.
Dorman 47128
Hope it works!
How did you order it if you don’t know what it was called
I’ve seen people call it different things so I wasn’t sure. It’s labeled as PCV on Amazon where I ordered it from
I don’t know what it’s called either but I think I can change one now
Awesome, thanks for watching!
Easiest way to do it, is turn pvc valve half way , then it pops right out as 1 piece
That would work if it’s not old and brittle, mine seemed like it was about to break if I would have kept pulling on the actual tube itself.
I think that only works on a 91-93 Valve Cover. Those years PCV/CCV Valves don't have separate grommets, they have a rubber seal that is attached directly to the PCV/CCV Valves and install/uninstall by rotating 90 degrees due to the slot in the hole in the Valve Cover. When you rotate it into the correct position it becomes tighter and makes the seal. On his 95 Valve Cover there is no Slot in that hole, it's just a hole that the Grommet presses into, and then the PCV/CCV Valves press into the Grommets.
Positive crankcase ventilation.
Thank you
Positive Ventilation Control/PVC
Thanks!
My rear hose broke when I tried to take it off.
Mine did as well. I ended up getting an OEM replacement for it: 4854265 Crankcase Vent Tube To Intake Manifold ，Crankcase Ventilation Tube Hose for 1997-2004 Jeep Wrangler TJ 4.0L, 1996-2001 Jeep Grand Cherokee XJ 4.0L 04854265 a.co/d/4X1HZjM
"20-30 minutes" took my dumb ass 2 days
I cracked my valve cover whem i tried prying
That’ll be a fun project. Check out this video if you need any help taking off the valve cover: th-cam.com/video/qbEopqYsSG8/w-d-xo.html
It's called a PCV Valve.
Thanks!
You have them swapped, the tall elbow is supposed to go in front, PCV. The FLAT elbow is the CCV elbow and that goes in the rear. In your video these were in the wrong place.
It;s not really about whether it's tall or short or black or grey, it's about the size of the hole underneath. His Black short one has a big hole underneath because it's hooked up to the Air Box or Air intake by a bigger hose. His rear one, the one that's hardest to reach nearest the firewall probably has the smaller hole as it should because the hose is immediately reduced down to a much smaller hose that is connected to the top of the Intake Manifold behind the throttle body. I have a shorter grey one that has the smaller hole, his shorter black one has the bigger hole. So in other words he did not have them swapped in the Video they were correct. Forget about what color they are or whether they are being called PCV or CCV and how tall or short they are and just pay attention to what they are supposed to do.
No they wouldn’t fit that way. If I put the tall one in the front it would hit the hood
You could have just Lifted the PCV valve up off the motor held the hose and twisted it off
True. Could’ve saved myself an extra 20 seconds
C.C.V