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"
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!
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.
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
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
....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: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-qbEopqYsSG8.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.
Good to know now that it’s just regularly difficult to remove in general. I’ll be able to do this myself now, rather than replace the whole valve cover or take it to a shop.
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
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
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.
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
That’ll be a fun project. Check out this video if you need any help taking off the valve cover: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-qbEopqYsSG8.html
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.
