Noisy Tank Vent Valve Turbo 958 2019
My local dealers have been unable to help with this unexpected and unseemly noise, and so I wrote Porsche NA. No joy. Have others encountered this, and what advice can you offer? There's a noticeable ticking sound from the engine compartment at idle, rather like a bad bearing knock. It's the loudest noise in the passenger compartment when idling or maneuvering at low speed, after the car is warmed up. It is not audible at speed, when road noise predominates. It does not change when the car is rolling - thus, it does not seem to come from the driveline. I reported this in a 2/25/19 E-mail to our local dealer. On the date of service, 3/4, they called to report that there was a loose and therefore rattling "tank vent pipe assembly" - for the fuel tank, that is, which apparently vents somewhere in the engine compartment. We turned around after half a mile and drove back to the dealer. What can be done to mitigate or isolate the noise? Relocating the valve, adding a rubber isolation mount, or putting an acoustic barrier between it and the passenger compartment all come to mind.
While the dealer might not have a solution to the problem, surely Porsche has heard about it from other owners, as it is unseemly in so expensive a car. Sincerely yours . . They all do that. Mine has done it since I got it. Mercedes uses the same valve and has a foam noise isolation cover for it. Dunno the PN, never bothered looking, but my local mechanic who works on lots of Mercedes was the one who told me. Facing the engine - the valve is to the left of the throttle body. I found the best way to alleviate this noise is more volume on the radio or stabbing the gas. It's there on mine also and I could care less. When someone says something about I put the pedal to the metal and say, there, it's gone! If you feel so inclined, find something to wrap it and get back to us on what you used and how it worked.
I would follow suit. Mine clicks too. I can hear it when I outside the car but not inside. If you put your finger on it while it's clacking away - it's an impressive clack. Needs serious noise stuff (Dynamat?) to quiet that sucker down. If you put your finger on it while it's clacking away - it's an impressive clack. Needs serious noise stuff (Dynamat?) to quiet that sucker down. I might try to wrap mine in foam. Do you think it gets hot? I don't want to burn it up. I might try to wrap mine in foam. Do you think it gets hot? I don't want to burn it up. No hotter than any other plastic in the area. It's a vacuum check valve - used on the CTT (and CTTS) to prevent turbo pressure from pushing back up the vacuum pipe that sucks captured gas fumes from the charcoal canister. At idle basically the manifold is very close to 0 vacuum/pressure, so the thing chatters. It's annoying but nothing harmful and as the dealer said - nothing you can "fix"..
If you're going that route find an auto-audio shop and see if they can give you a small scrap of Dynamat. That is meant to absorb sound, it would seem to be the most effective solution. Take lots of pics and then write up a DIY. You could drive around for a while and then measure the temperature of the valve, and anything else the dynamat might touch. Then you would have an idea as to how hot it gets there. Good points guys. I'm gonna see what I can come up with. Well, I checked out the valve and that sucker is pretty well isolated. I don't think I can do any better. Almost all of it is surrounded by rubber. There is really no area left for the Dynamat. It would be more trouble than it is worth for me to change the way it's attached. Mine doesn't bother me enough to go away further. I'd like to pursue the Mercedes part; an online search, however, did not turn up anything.
I'd be grateful if you can find out more from your mechanic. For now, clackety clack! Indeed, turning up the radio or hitting the loud pedal make the problem go away, but all good things come to an end, and then it's clackety clack again. I've ordered some Dynamat and will report back. There have been a number of "me too" responses, indicating that this is a widespread problem, and I think I'll follow up with Porsche to let them know this. Accordingly, if you have the same problem with your car, even if you have no suggestions to add, please chime in. Accordingly, if you have the same problem with your car, even if you have no suggestions to add, please chime in. I no longer own my 2011 CTT, but yes, mine did it too. Is it directly from the valve through the air, in which case Dynamat or Mercedes foam surround might fix it? Is it through the mount to the engine, even though it appears to be rubber isolated at least in part? Is it through the semi-rigid plastic plumbing to and from the valve? I'll report on the results using Dynamat; additional suggestions are welcome. Marketplace Parts Marketplace Vehicle Marketplace Vendor Announcements Rennnlist Help and Announcement Forums Rennlist Forum Glitches - post them here. Test posts are permitted.