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Unread 08-28-2011, 07:53 PM   #1
JeepN4KC
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PCV valve

Hey all,

I want to inspect PCV valve but I have a few questions:

1. Where exactly is it?

2. What am I looking for during inspection?

3. Any tricks to replacing it?


Thanks in advance for any help!

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Unread 08-29-2011, 12:41 PM   #2
Nejeep
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Depends on the model year and engine. Guessing by your sig it a 2007 but, what engine do you have?
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Unread 08-29-2011, 11:42 PM   #3
JeepN4KC
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It is a 2007 4.7L V8 Flexfuel. Turns out it is on the driver side header closest to the firewall. Anybody here ever taken one of those out to check or replace? The thing is in a wasps nest of vacuum lines and wires and tucked right up against the firewall
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Unread 08-30-2011, 11:21 AM   #4
JeepN4KC
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pcv valve swap

Update:

Got the new pcv valve from dealer and replaced it. The old one was dirty but the machanism still rattled. Maybe could have gotten away with sprayin it with carb/brake cleaner -but - I figured I already went through the trouble to figure this out and get the old one out. So, I put the new one in:

It just screws in and out. Caution: if you just drove from the shop to get the part, then the one you're taking out will be hot. There is a hose that seats on top of the valve - just pull it off. Used a set of channel locks to unscrew the old and set the new one. (If you look at the fourth pic closely you can see it threads in just past the rear of the fuel rail). Reattatched the hose to the top of new pcv valve. Piece of cake!

The WK has around 54k miles and was having an erratic idle that hovered around 500rpm's. Now it purrs along at a steady 600rpm's. Plus, while I was figuring all this out, yesterday I changed fluids in front/rear diffs &
t-case, and changed brake pads. A good couple days work!

I have pics but have no idea where to add attatchments.
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Unread 08-30-2011, 11:56 AM   #5
JRLT
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Quote:
Originally Posted by JeepN4KC View Post
I have pics but have no idea where to add attatchments.
Easier to just upload to a photo site like photobucket.com and then copy & paste the "IMG" code they give you into the white space. Do the "Go Advanced" instead of quick reply that way you can preview your post and see if your pics are working.
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Unread 08-30-2011, 12:51 PM   #6
JeepN4KC
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pics of pcv valve swap

Thanks for the heads up with photos JRTL. Again, this is on an 07 WK 4.7L
V8 flexfuel. Anyway, here are some pics for anybody wanting to do this:

New pcv valve with mopar Part#:


PCV valve with light shining on it "glowing" in the back:


Blue clip (this is actually the flange to the plastic piece fitted to the body):


Threaded slot just beyond fuel rail:


New pcv valve threaded in with hose boot reattached:

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Last edited by JeepN4KC; 08-30-2011 at 02:06 PM..
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Unread 08-30-2011, 05:33 PM   #7
wcjr
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Does anyone have a picture of the location on a 2005 hemi?
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Unread 08-30-2011, 06:56 PM   #8
Jeepin1990
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Where did you purchase the valve. And where is located on the 3.7l wk. 2006?
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Unread 08-30-2011, 07:11 PM   #9
Nejeep
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Quote:
Originally Posted by Jeepin1990 View Post
Where did you purchase the valve. And where is located on the 3.7l wk. 2006?
The PVC on a 2006 3.7 is on the side of the oil fill tube. Pull off the hose and rotate the valve CCW about a 1/4 of a turn. Note - they changed the location after 2006.
FWIW the rattle test is not a lot of help if the spring is broken or weak. Just replace the PCV if its time or your think there's a problem. The dealer is probably the best source, but I got mine from NAPA.
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Unread 08-30-2011, 07:21 PM   #10
Jeepin1990
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Quote:
Originally Posted by Nejeep

The PVC on a 2006 3.7 is on the side of the oil fill tube. Pull off the hose and rotate the valve CCW about a 1/4 of a turn. Note - they changed the location after 2006.
FWIW the rattle test is not a lot of help if the spring is broken or weak. Just replace the PCV if its time or your think there's a problem. The dealer is probably the best source, but I got mine from NAPA.
What would be some reasons for changing the valve?
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Unread 08-30-2011, 10:01 PM   #11
Billybcpt
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Quote:
Originally Posted by wcjr View Post
Does anyone have a picture of the location on a 2005 hemi?
The PCV valve on the HEMI is located on the top of the engine towards the back on the left. It's black and has a hose running from it into the intake manifold. It twists right off in a counter clock-wise direction, may be tight though. Shake it, if it rattles it's most likely good just clean it up with some brake cleaner then reinstall tightly. Hope this helps!
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Unread 08-31-2011, 03:05 PM   #12
Nejeep
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Quote:
Originally Posted by Jeepin1990 View Post
What would be some reasons for changing the valve?
In my case I was getting oil dripping onto the air filter element from the PCV air inlet hose connected to the top part of the filter housing. Air is supposed to be flowing from the air filter housing into the PCV system not the other way. I suspected the PCV valve was not flowing enough, so I replaced it and the oil dripping stopped. There was a noticable increase in air flow (suction) thru the PVC hose at idle with the new NAPA PVC valve. I cut the old valve apart to see if the spring was broken or stuck, but it looked pristine inside. Guess it was just a weak spring from the factory as it had only 25k miles on it at the time. The spring pushes the valve open so if it gets weak or breaks it closes further than it should and reduces air flow.
The old valve still rattled very nicely, but as I now know that is not a positive test.
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Unread 09-08-2011, 10:30 AM   #13
08WKJGC
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Quote:
Originally Posted by Nejeep View Post
The PVC on a 2006 3.7 is on the side of the oil fill tube. Pull off the hose and rotate the valve CCW about a 1/4 of a turn. Note - they changed the location after 2006.
FWIW the rattle test is not a lot of help if the spring is broken or weak. Just replace the PCV if its time or your think there's a problem. The dealer is probably the best source, but I got mine from NAPA.
I want to change the PCV valve on my 08 3.7, can somebody post up a pic of the location of it? Thanks!
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Unread 09-10-2011, 10:42 PM   #14
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Nobody has changed one on a 07+ 3.7l?
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Unread 09-10-2011, 11:08 PM   #15
JRLT
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Here's the one I got for my 2010 3.7.


I see mine is driver's side by the firewall.
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