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shlong
Dodge Dakota
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4/03/2002
23:01:28

Subject: when to replace PCV valve
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When should i need to replace my PCV valve in 2001 4.7 Quad Cab with 24k miles?
Thanks



kevster
Dodge Dakota
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4/04/2002
21:20:03

RE: when to replace PCV valve
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I replaced mine at 30,000 and it still rattled fine, but i said what the heck. 12.00 at the Dealer only part.



WhiteDak
Dodge Dakota
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4/16/2002
13:27:49

RE: when to replace PCV valve
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Good question, I saw in Autozone where it said replace your pcv valve every 12,000 miles but if it still works fine then why? Does it wear down like spark plugs? I was under the impression that it was either working or not, and you should replace when not working. Anyone out there that can answer this?



Bruce P
Dodge Dakota
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4/16/2002
21:43:48

RE: when to replace PCV valve
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Lets understand the PCV valve a little better before we decide on a replacement schedule.

The PCV valve has several functions.

Obviously, its main function is to ventilate the crankcase. There are 2 "modes" of ventalation
1) under high-intake-vacuum conditions, the mechanisim in the PCV valve is sucked agains a calibrated spring and provides a small measured flow out of the crankcase.

2) Under LOW-intake-vacuum conditions, the spring pushes the valve open and the ventalation flow is MUCH higher. The spring is calibrated to allow full flow at normal throttle positions such as cruseing.

The final function of the PCV valve is to protect from engine explosions. (The fumes in the crankcase are very flamable) This is accomplished by the spring being able to totally CLOSE the PCV valve if any pressure is present in the intake plenum. (such as a backfire)This prevents any flame or spark from getting past the PCV valve into the crankcase.
======================

Ok, now lets discuss what can "wear out" in a PCV valve.
We can always clean a PCV valve of any gunk build up with the approprate solvent.

This leaves only the spring and the mechanisum within the valve that may actually "wear". I guess that the spring COULD change its springrate over time and this would cause the low-vacuum ventalation conditions to become less. I would think that the mechinisum itself would not actually "wear" to any degree.

HOWEVER... on the 4.7L V8 hemi... the PCV valve is mounted sideways, this MAY introduce some wear patterns that are not present on the vertically-mounted PCV valves.







handi2
GenIII
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4/16/2002
22:03:03

RE: when to replace PCV valve
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Thanks for the informative post.

Years ago when I worked on auto's I would usually just clean the PCV valve if I knew it wasn't very old. But, b/c they are so cheap you might as well buy a new one. Probably once a year.

http://photos.yahoo.com/handi254310

2002 Quad Cab SLT Plus 4.7 Every Available Option
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sandman
Dodge Dakota
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4/16/2002
22:22:13

RE: when to replace PCV valve
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Bruce good point about the sideways mounting and new wear pattern posabilitys.



Patrick ODay
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4/17/2002
02:17:05

RE: when to replace PCV valve
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Can a worn out PCV valve affect performance? (of the Dak) If so, what are the symptoms?

A stock Dakota is great place to start

Bruce P
Dodge Dakota
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4/17/2002
21:43:59

RE: when to replace PCV valve
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(handi2)
I do not consider the PCV valve for the 4.7L V8 to be "cheep". Since it is a "dealer only" item, there is no compitetion for lower prices on this part. I expect that since the 4.7L V8 and its lopped-off little brother the 6-cyl 3.7L become standard engines throughout all of the DC product lines... this will become a Wall-Mart comodity.


(Patrick ODay)
A PCV valve that is sticking open will cause the engine idle to be erratic. With carberators, the performance was affected greatly. With todays Electronic Fuel-injection, the computer tends to compensate for a sticking PCV valve to some degree. I have seen a sticking PCV valve cause stalling. This is caused by intake are being able to "bypass" the MAP/MAF sensor thus confusing the idle airflow calibration.





Riley
Dodge Dakota
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4/18/2002
18:19:26

RE: when to replace PCV valve
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Is the PCV in the 4.7l easy to replace. I looked at mine the other day and an AC component is place right over the top of the PCV valve. Please let me know how to replace. Also, do our engines have a crankcase breather? Thanks

Riley



Bruce P
Dodge Dakota
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4/18/2002
22:49:25

RE: when to replace PCV valve
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4.7L V8 PCV valve R&R

1)Pull hose off of PCV valve. (hold PCV valve body so you do not break plactic "ears" on oil-fill tube!)

2) Twist PCV valve 1/4 turn till the hose-nipple points twards ground. Pull PCV valve straight out of oil-filler neck. (there is a small rubber O-ring on the PCV valve that makes it 'stick' a bit.)

There is no special "crankcase breather" filter. Instead, there is a hose that plugs into the side of the air-filter housing that is the "intake" side of the PCV system. This hose Ys into 2 hoses each feeding one of the cylinder banks on the firewall side of the engine.(In other words...The engine air-filter serves as the PCV filter too.)

One reason for this design is to "normalize" the air pressure on the "intake" side of the PCV system. As the air-filter plugges up with dirt, the PCV system "senses" this and compensates for the difference in air pressure on the "engine side" of the airfilter.

Another reason for this design is to force the engine to "burn" any fumes that come out of the crankcase no matter WHICH way they come out.



Chas
Dodge Dakota
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11/30/2002
14:50:43

RE: when to replace PCV valve
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Where is the PVC valve located on my dad's 1995 Dakota 5.2 liter Mark III?



sandman
Dodge Dakota
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12/01/2002
08:39:02

RE: when to replace PCV valve
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When it goes bad. You normaly check to see if it rattles, then you blow through one side. If everthing checks out you clean it and reinstall it. I have had some PCV valves last 5 years or more while others lasted about 2 years. As far the after market recomendation of replaceing every 12,000 miles remember who is saying this. Companys that sell filters have a vested interest in you changeing frequently. Most trans filter kits recomend changeing between 12,000 miles when OEM says 24,000-50,000 on most vechiles. Fuel filters normaly say to replace every 12,000 mile on the side of the can but OEM recomends every 50,000-80,000 miles.While there is nothing wrong with changeing sooner then you need to your maintence costs could get pretty high if you are routinely changeing out parts that are still good and doing their job. On a positive note filters are pretty cheap.



leon
Dodge Dakota
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9/03/2003
14:48:24

RE: pcv valve
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Would a bad pcv valve cause your vehicle to smoke after warm-up? I have an 86 mustang gt and I don't know what is causing it to smoke. Compression is good, but I was thinking it could be the valve guide stem seals. Any reply would be gladly appreciated.

Thanks,
Leon



Murf
Dodge Dakota
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9/03/2003
15:19:23

RE: when to replace PCV valve
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I had a PCV stick open on my Dak once. I was using oil but could not find any leak. Intake gasket proved to be Ok. The only thing left to check was the PCV. Replaced it and no more oil consumption. I just figure it stuck open and was sucking the oil mist from the valve train.



Judy Barillar
Dodge Dakota
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1/15/2004
07:58:29

RE: when to replace PCV valve
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I have a 1999 jeep grandcheroke - 85,000 miles. After driving for a while the car shuts down. I have to put in neutral and start up again. Also I have been having hard starts when I first turn the car on in the A.M. My mechanic changed my oil and showed me the gunk ( clay color ) on the inside of the cap. He said this is probably due to needing to change the pvc valve, and he will put an engine cleaner in and then replace the oil.....because of the above symptoms. Does this sound right?



eddie_orlando
Dodge Dakota
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1/15/2004
08:32:36

RE: when to replace PCV valve
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On my 95 2.5 Dak (don't laugh) I replaced the "intake" part of the PCV setup with a K&N breather. The ouput part which routes into the TB still has a PCV valve. The factory air filter setup/box was providing the "intake" but when I made my own cold air (cut off the factory air box, replaced with a K&N cone filter) I put a K&N crankcase filter directly on the valve cover. KRC did the fabrication of my K&N FIPK homebrew. Marty said the crankcase filter served the same purpose, the PCV valve stayed the same. from my understanding it's sort of a push/pull relationship to remove spent gases from the engine. It also looks a lot more trick with the chrome topped baby K&N there instead of tubing.



Don
Dodge Dakota
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1/26/2005
21:04:55

RE: when to replace PCV valve
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Could someone help me? Where is the PVC valve for Dodge Dakota 4.7, V8 engine? I can't find it. Thanks



01quadcab4x4
Dodge Dakota
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1/28/2005
19:04:32

RE: when to replace PCV valve
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On the 4.7 it is located on the side of the oil filler neck.



Dave1
Dodge Dakota
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1/04/2015
09:20:06

RE: when to replace PCV valve
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Will a bad PCV valve cause multiple engine misfires?



Joe Miller
Dodge Dakota
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9/21/2020
07:34:49

RE: when to replace PCV valve
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Can someone tell me where the location of
the PCV valve is on a 2005 Dodge Dakota
3.7 V6 please.



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