Where is pcv valve located on 4.7 ho? - JeepForum.com
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post #1 of 10 Old 09-16-2020, 08:08 PM Thread Starter
iaintslow
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Where is pcv valve located on 4.7 ho?

Stupid question but where is pcv valve located on 4.7 HO? Is there 1 or 2 of them?
Thanks

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post #2 of 10 Old 09-16-2020, 08:38 PM
sdg3205
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Oil fill cap.

There are some PCV breathers on the back of the heads as well.
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post #3 of 10 Old 09-16-2020, 08:59 PM Thread Starter
iaintslow
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Hum pcv and breathers? thats strange i want to replace pcv valve is there anything else needs to be replaced as part of pcv system??
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post #4 of 10 Old 09-16-2020, 09:58 PM
blueseasons
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Remove the oil filler cap and look inside. You will see a hole on the side. Stick your finger on the hole with the engine running, your finger should get sucked against the hole. Engine rpms will drop. If both those things happen PVC is good.
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post #5 of 10 Old 09-16-2020, 10:01 PM
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post #6 of 10 Old 09-16-2020, 10:06 PM
Uniblurb
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^ Real good info Falkon and I was going to look up some part numbers for him but he never gave the year.

It helps to have the plastic/tubes warm where you're less apt crack or break one. And add a little oil to the PCV o-ring so it seals easily.

2004 4.7L WJ Limited, 96 4.0 ZJ


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post #7 of 10 Old 09-16-2020, 10:09 PM
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That's from WJ Jeeps Site.
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post #8 of 10 Old 09-17-2020, 06:13 AM
Uniblurb
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Thanks for the location of that info. Believe I pushed my old PVC valve a little before I turned it 1/4 turn counter-clockwise to remove it. Also my hose was split so I installed a new short piece of oil resistant hose with new clamps.

2004 4.7L WJ Limited, 96 4.0 ZJ


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post #9 of 10 Old 09-17-2020, 12:36 PM Thread Starter
iaintslow
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Thanks guys great info. I will replace the valve when i get home. I got new one already its only $4 at pepboys
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post #10 of 10 Old 09-18-2020, 06:53 AM
AVR2
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Some might consider it overkill, but to avoid damaging the hose (because they never seem to want to pull off the end of the valve without a lot of force) I use my Dremel to cut the old valve, then use pliers to pull the cut end of the valve out of the hose.
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