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Well, I joined the party... I've tried to replace the membrane as well without success.  I couldn't get to the last triple square, and maybe somewhat stripped the middle one. I may attempt it again with moving the coolant hoses..  If not, I'll be taking it to the dealership for the valve cover install.   I have no codes, but the whistling seems to be getting worse.  I like the 957, but this job is a pain for sure, gone are the days of Autozone 10.00 PCV valve pulled from the top of valve cover, 2 min install.. 

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Here is a follow-up and a few learnings from that job. First, never use electric tape to temporarily fix the crankcase  breather hose while waiting for a new one to arrive...tape melted and I got a huge vacuum leak on my way to work. Duct tape is the way to go 👍

Secondly, despite replacing my PCV valve which I knew was bad, the CEL came back with the dreaded P12A2 code. Now, to think I did all that work for nothing was a bit upsetting to say the least. I ordered a new fuel pressure sensor that I have not installed yet. Meanwhile, I checked my fuel tank cap and noticed it did not close tight, because the o-ring seal was all shrunk and cracked. Knowing this too can cause a P12A2 code, I swapped with the gas cap from my 911, just to try. I cleared the CEL code and went to work with the Cayenne. And bingo! The CEL light did not turn in on my way back as it usually does. So, before taking off your intake to change your valve cover, check you gas cap first would be my advice 😎.


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All of you that have done this: did you replace all gaskets? (Intake, valve cover, etc..) or just the membrane with the square piece? 

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Well. I have the manifold loose. I can't seem to get the fuel pressure sensor plug off the sensor. That may be what is keeping it from coming loose. Any ideas how to take it off? I'll try to post pics .. almost got this off.. 

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I'll keep this thread alive I guess. I got it off now. But I'm having problems getting the membrane housing off of the valve cover.. side note: wow, there's a lot of sludge on my valves !!!! 


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Posted (edited)

Yeah the compromise of a direct injection engine is they don't have the washing effect from fuel being injected upstream.

Edited by shonuff

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Had to put this on back burner due to work, but I'm attacking it today. I can't seem to get the intake and injectors lined up. I have the injectors loosely installed and I'm trying to position the intake between it and the block. Any pointers? How did everyone do this? Thx 

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