Ongoing change over valve issues on 991
Race Director
Joined: Nov 2014
Posts: 13,799
Likes: 209
From: FL
Duke,
Could have been the vacuum hose coming loose. I think that's common.
From what I've gathered, these new COV's just became available within the last few weeks. As of of a week ago, they hadn't even updated the new harness info. The dealers and parts warehouses have been told to deplete the older version first before installing these.
Had they been installed on 2016's I assume they would have been out a year ago. Maybe new for the 991.2's? I will try and find out.
I'm not much of a tech guy, so someone like Plenum could answer more of these other detailed questions.
Could have been the vacuum hose coming loose. I think that's common.
From what I've gathered, these new COV's just became available within the last few weeks. As of of a week ago, they hadn't even updated the new harness info. The dealers and parts warehouses have been told to deplete the older version first before installing these.
Had they been installed on 2016's I assume they would have been out a year ago. Maybe new for the 991.2's? I will try and find out.
I'm not much of a tech guy, so someone like Plenum could answer more of these other detailed questions.
Race Director
Joined: Nov 2014
Posts: 13,799
Likes: 209
From: FL
Originally Posted by fbroen
FWIW the valves ending in "F", with a different wire harness, were out in late 2014.
The PCNA warehouses still have version #2 in stock and have been told to use those before moving to the F version. Were the "F" used in another model first?
Three Wheelin'
Joined: Feb 2012
Posts: 1,458
Likes: 233
From: SF Bay Area
I had an F valve installed, with the new and different wire harness, in late 2014. (It took a looong time for my parts guy to get his hands on one back then. He had the wire harness almost right away, but took a month for the F valve to appear).
In March 2015 after a track weekend, I mistakenly thought it had failed, but it was the vacuum line popping off.
Since then, I have not had any issues. Knock on wood....
Clarification: I should add that I asked for an F valve specifically (thank you internet users for knowledge basis). This seems to give credence to the notion of them using up the earlier valves first -- which seems sort of silly, when they are known to be unreliable.
In March 2015 after a track weekend, I mistakenly thought it had failed, but it was the vacuum line popping off.
Since then, I have not had any issues. Knock on wood....
Clarification: I should add that I asked for an F valve specifically (thank you internet users for knowledge basis). This seems to give credence to the notion of them using up the earlier valves first -- which seems sort of silly, when they are known to be unreliable.
Last edited by fbroen; Mar 10, 2016 at 10:29 AM. Reason: Clarification
Three Wheelin'
Joined: Feb 2012
Posts: 1,458
Likes: 233
From: SF Bay Area
Race Director
Joined: Nov 2014
Posts: 13,799
Likes: 209
From: FL
Originally Posted by fbroen
Don't be a stranger here on RL! Not sure if you're still on 6Speed much.
Three Wheelin'
Joined: Feb 2012
Posts: 1,458
Likes: 233
From: SF Bay Area
I have to be honest with you; who cares? Drive your car, enjoy it, when it breaks take it in and have it looked at. 6 months before the warranty expires sit down with your service advisor and have a candid conversation about what you should look for before the warranty runs out. I owned and drove a 996 c2 cab for 7 years with zero issues out of warranty. I owned and drove a 01 996 turbo for 10 years with zero issues out of warranty. Both should be basket cases if you believe what you read on the internet. 
My point is that every modern car has a list of issues and you can drive yourself crazy working about it. Just enjoy your ride!
My point is that every modern car has a list of issues and you can drive yourself crazy working about it. Just enjoy your ride!
But while the COV valve issue is unfortunate, I have embraced this ethos^^ fully. Enjoy until/if the next valve goes, and then get it replaced.
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Race Director
Joined: Nov 2014
Posts: 13,799
Likes: 209
From: FL
Originally Posted by CSK 911 C4S
Do you guys know if the wiring harness is a plug and play harness or is it a cut and splice?
Just thinking long term if one fails and I personally have to replace.
Just thinking long term if one fails and I personally have to replace.
Race Director
Joined: Nov 2014
Posts: 13,799
Likes: 209
From: FL
Originally Posted by fbroen
Thumbs up to this approach. There was a time when it got to me.
But while the COV valve issue is unfortunate, I have embraced this ethos^^ fully. Enjoy until/if the next valve goes, and then get it replaced.
But while the COV valve issue is unfortunate, I have embraced this ethos^^ fully. Enjoy until/if the next valve goes, and then get it replaced.
After all, this has been an "ongoing" issue. Pretty much the only major issue 991's have had. Good news that's all it is though.
Racer
Joined: Jan 2012
Posts: 421
Likes: 2
I personally had two change-over-valves fail on my 2012 C2 991.
The first was related to the HVAC. I got no heat at all.
The second was related to the Sound Symposer. It wasn't opening up when I pressed the Sport button.
Both times replaced under warranty. But neither one triggered a warning message for me to see.
In face I didn't even realize my Sound Symposer wasn't functioning until I had the car in for something unrelated and they caught it.
Pissses me off that there are still a bunch more of these that could fail at anytime in or out of warranty. Including the ones there were replaced.
The first was related to the HVAC. I got no heat at all.
The second was related to the Sound Symposer. It wasn't opening up when I pressed the Sport button.
Both times replaced under warranty. But neither one triggered a warning message for me to see.
In face I didn't even realize my Sound Symposer wasn't functioning until I had the car in for something unrelated and they caught it.
Pissses me off that there are still a bunch more of these that could fail at anytime in or out of warranty. Including the ones there were replaced.
Rennlist Member
Joined: Jun 2014
Posts: 4,196
Likes: 1,044
From: Dickson, TN
I whole heartedly believe if you have one of these valves go south after your warranty period they will step up to the plate and cover it. Time will tell.
Race Car
Joined: Mar 2013
Posts: 4,424
Likes: 737
From: Northern Virginia
6 for manual and no PSE
Add one each if you have PDK and PSE which would be 7 or a grand total of 8.
Mind you, these are covered under warranty. They did a voluntary replacement on some of them (not all) on the early 2012.5/2013 cars, but that was for the second version. They just now came out with the third version for the 991.1 because they are still having failures. Seems to be related to condensation. They went with a new manufacturer this time. I assume none of the new 2016's even have this version. Not 100% sure though. I'd have to check.
Have my car in for other work, and just decided to change them all out as a preventative measure at my cost. My car is still under warranty. Just don't feel like dealing with one or more failures. I think for some, you might not necessarily notice either from what I've read in this thread.
Two common ones that fail are for the PSE and heating system for the cabin.
Add one each if you have PDK and PSE which would be 7 or a grand total of 8.
Mind you, these are covered under warranty. They did a voluntary replacement on some of them (not all) on the early 2012.5/2013 cars, but that was for the second version. They just now came out with the third version for the 991.1 because they are still having failures. Seems to be related to condensation. They went with a new manufacturer this time. I assume none of the new 2016's even have this version. Not 100% sure though. I'd have to check.
Have my car in for other work, and just decided to change them all out as a preventative measure at my cost. My car is still under warranty. Just don't feel like dealing with one or more failures. I think for some, you might not necessarily notice either from what I've read in this thread.
Two common ones that fail are for the PSE and heating system for the cabin.
Race Car
Joined: Mar 2013
Posts: 4,424
Likes: 737
From: Northern Virginia
I personally had two change-over-valves fail on my 2012 C2 991.
The first was related to the HVAC. I got no heat at all.
The second was related to the Sound Symposer. It wasn't opening up when I pressed the Sport button.
Both times replaced under warranty. But neither one triggered a warning message for me to see.
In face I didn't even realize my Sound Symposer wasn't functioning until I had the car in for something unrelated and they caught it.
Pissses me off that there are still a bunch more of these that could fail at anytime in or out of warranty. Including the ones there were replaced.
The first was related to the HVAC. I got no heat at all.
The second was related to the Sound Symposer. It wasn't opening up when I pressed the Sport button.
Both times replaced under warranty. But neither one triggered a warning message for me to see.
In face I didn't even realize my Sound Symposer wasn't functioning until I had the car in for something unrelated and they caught it.
Pissses me off that there are still a bunch more of these that could fail at anytime in or out of warranty. Including the ones there were replaced.
Black mark on an otherwise near-flawless machine. I have had only one other minor problem (one of the engine fans quit working). If they fix the COV problem once and for all...wow, that would be fantastic. Again, since I have had this fixed (about a year and a half ago), I have not had any problems since (knock on wood).
I go out of warranty in just 34 days!
Race Director
Joined: Nov 2014
Posts: 13,799
Likes: 209
From: FL
Funny! I had a fan go out as well.
But like mentioned, a near flawless 991.1 model. Just good to talk about the small details as well. Because it is a big deal if one of these COV's go out.
From the information I've gathered, it looks like this new version started somewhere in the 2016 model year. This part is currently on its fourth revision. It's also being made by a new manufacturer.
But like mentioned, a near flawless 991.1 model. Just good to talk about the small details as well. Because it is a big deal if one of these COV's go out.
From the information I've gathered, it looks like this new version started somewhere in the 2016 model year. This part is currently on its fourth revision. It's also being made by a new manufacturer.