anyone ever replace the PCV valve?
 

Yep I've blown a second AOS this week in less then 2500 miles. Some have suggest the PCV valve might not work and increasing pressure handle by the AOS, thu breaking it again.
Solution would be to change the PCV valve at the same time as AOS, but it look like a hell of a job to reach it.
Anyone ever change it? any tip on how to do it?

thanks
Chris

Have you checked your oil scavenger pumps? I thought those could contribute to this issue.

I have not open the pump, but i have check the installation orientation and they are right.
Changing the AOS is the easy part lol, finding why it's broken again seam to be the real challenge!

Later
Chris

Oil fill perfect?

Yes oil level was good

Chris

or take that testdrive and then trade it in as is:dance:

Wow what an afternoon, lots of stuff done that I will talk in an other thread, but about the PCV valve. I've worked over an hour trying to get it off and I succeed! I dont know how I will put a new one in, but thats an other story!

So If I understant it well, the PCV valve is a spring loaded ball bearing that open at a certain amount of pressure. well mine seam to be stuck quite well. I've been able to unstuck it but it does not seam to move so freely. I dont know if that will help for the AOS but sure it should be better if the PCV valve is properly fonctionning!

Later all
Chris

P.S. dont ask how I did get it out, too complicated, I'll just say I did it tru the firewall opening.

Hi Chris.
You might find this thread interesting/helpful:
Question on Boxster Air Oil Separator - Pelican Parts Technical BBS

Thanks Meir

I saw that thread, I even revived it hoping there was something new about it.

Later all
Chris

I just changed my AOS less than 10k miles ago and its blowing oil again into the manifold again... i'm thinking the PVC valve might be the reason?

Question... if a bad PVC is the reason my AOS is blowing oil and I fix the PVC, do I need to also replace the AOS again? Or will that operate normal once the PVC/vac problem subsides?

Hi

I think you need to change the AOS anyway because from what I understand it's a diaphragm inside that break.

I just change the PCV valve and AOS and all is running good right now, I hope it will last this time.

Later
Chris

Probably a good idea to do both I guess...
On a scale of 1-10... How hard is the PVC? Harder than the AOS? Ive done that... It was a bit of a pita...

PCV valve, I would say as hard as the AOS the first time. Its just so tight in there. Hardest part I think was reconnecting the hose to the PCV valve.

later
Chris

Is it easier with the manifold removed? I did the AOS with it on before, but if it makes it easier to change both by taking off the manifold ill probably do that... Not sure if that's even a good idea?

Thanks for the input...

Its probably easy with the manifold removed, but I defenitly didnt want to remove it.

Later
Chris

pcv
 

I accessed the PCV with the firewall panel and the engine cover removed. There was evidence of oil on the manifold top around the PCV. I cleaned the PCV with carb cleaner and the spring loaded valve seemed to be working ok after the cleaning.

I worked from behind the drivers seat to remove the PCV. Thru the firewall, I had to disconnect an electrical connection and remove a bracket and carefully move a hose out of the way but the part was not too too bad to remove. I reached both thru the firewall and down thru the open upper engine cover. Going down thru the upper engine cover, you'll need long extensions for your 1/4 drive sockets to loosen the bolt holding the PCV. As always, the stupid two tab squeeze fitting was a mother to release.

To reattach the PCV, I used a long extendable magnetic "wand" or part grabber to put the bolt holding the PCV in place back in the threaded hole.

It is a hard to get at part.

I found this thread intriguing, I did not know there was a PCV valve on these motors. I have replaced the AOS four times on the Jӓgermobile over the years so I decided to search, remove, and inspect the PCV today. Thanks to wawa and rem503 I was able to find and remove the valve.

http://986forum.com/forums/uploads01...1432431824.jpg
http://986forum.com/forums/uploads01...1432431850.jpg
http://986forum.com/forums/uploads01...1432431868.jpg
http://986forum.com/forums/uploads01...1432431884.jpg
http://986forum.com/forums/uploads01...1432431902.jpg

It was definitely plugged-up on the spring valve side, I could not get air to move in or out of that side of the valve. I placed it in Mystery Oil for about an hour, hit with some carburetor cleaner, then I soaked it in Mystery Oil again for about 30 minutes. After cleaning I could get pressured air to flow through the spring valve.

Why not just replace it, it is a $20 part at retail............

Pcv..?
 

JFP, how often does the PCV valve has to be replaced..?

I am on my third AOS (80k) and after reading this post, it seems that this could be cause for the short lived AOS.

I already bought the two accordion hoses that connect to the AOS, perhaps may be a good idea to buy the PCV valve and replace it at the same time.

Question: Does the lower accordion hose connects the AOS with the PCV valve..?

Thanks in advance!

We do it when they start to look nasty, or to stick. If someone has suffered and AOS failure with lots of oil in the intake system, we always change them out after cleaning everything else.

So I could save $20 towards my next Porsche.:)

JFP,

By any chance do you have the P/N for the PCV valve for a 987 ('07 CS)..?

Thanks again!

PS I tried looking in Pelican's but they show everything else but a PVC...

I'm not sure as I am away from the shop at the moment, but I think your car uses a different method than the M96 engines did, which may be why you did not find it on their website. Perhaps check with a dealer tomorrow.

They stopped using this valve on the Boxster I believe on the 2003 models. They switched to an open fitting. This is what they look like.

http://c767170.r70.cf2.rackcdn.com/R99610704700.jpg

Kram, Thank you for posting the picture!

Otherwise I would have still be on the middle of a witch hunt.. LOL

This place rocks..!!! :)

Porsche still lists this part as a valve ? is it valve or just an open fitting ?

AOS accordion hoses replacement
 

Two days ago, I finally replaced the two accordion hoses that connect to the AOS and cleaned the engine as the bottom hose was leaking underneath the intake plenum and the top hose had a pinched o-ring where it connects to the AOS.

Question: I noticed that the engine runs smother and has more power, however is this indeed by the fact that the engine vacuum helps the piston rings seal better, therefore makes more power? Or is just my imagination..?

This part is inexpensive : 996 107 047 51
Connection Piece for Oil Separator Vent Line 99610704751 - Genuine Porsche - 996-107-047-51 | Pelican Parts
BUT it is very tedious to replace. Cleaning it may be foolish because of the R&R issues.
1. We really need a Test Method to determine if it is malfunctioning.
2. The later open valve 996-107-047-00 - is it considered an upgrade/substitute for pre-2003 cars ?
http://www.pelicanparts.com/cgi-bin/ksearch/PEL_search_2016.cgi?command=DWsearch&description=v ent+line+valve
3.We also need to decide on the while-you-are-in-there list .As Gilles mentions- the Accordian hoses or their O rings are also problematic.
http://www.pelicanparts.com/cgi-bin/ksearch/PEL_search_2016.cgi?command=DWsearch&description=v ent+line+hose+AOS

I just got mine changed thanks to wawa and Jager. The bolt was real easy. It popped out of the hole easy too. I used hose pliers for that but you can probably just pull it out. The trick to disconnecting it from the hose was to turn it 90 degrees so you can grab the vent and hole with your left hand and squeeze the tabs with the right hand. Getting that grip was key because it is so tight in there. I also warmed it up with a heat gun and lubed it with silicon spray to help with removal.