[Fliz]

I have an '18 BS with about 1000 miles on it. Manual and standard exhaust (no PSE).

Recently I started noticing a rattle/buzz at around 2900 - 3000 rpm. It's not super loud, but definitely noticeable and, of course, once you hear it you, you can't un-hear it....

Anyone else notice this?

I will likely bring the car for service unless it resolves in the coming days.

Cheers!

 

[johan]

Do you hear it o feeling it?
If its by ear it could be the sound aktor, i disconnected mine an the ride was better soundwise.

 

[TEST DRyVer]

How did you disconnect it?

 

[Fliz]

Do you hear it o feeling it?
If its by ear it could be the sound aktor, i disconnected mine an the ride was better soundwise.

I hear it. Sounds metallic. Like metal vibrating on metal. Reminds me of one of my old cars where the exhaust rubber grommets were toast.... interesting about the sound device.

 

[johan]

The sound aktor are mounted between the seats on the firewall.
In the rear trunk to the left right behind the Wheel, remove the interior and you see a box thats bolted to the chassi.
Use a screew driver to press on the lever to disconnect the Contact.


The device thats bolted to the chassi looks like this.

You cant miss it, and its mounted in this way so you have to remove the small bit of foam on the bottom under the lining to be able to get the Contact of.

 

[4802]

The sound aktor are mounted between the seats on the firewall.
In the rear trunk to the left right behind the Wheel, remove the interior and you see a box thats bolted to the chassi.
Use a screew driver to press on the lever to disconnect the Contact.


The device thats bolted to the chassi looks like this.

You cant miss it, and its mounted in this way so you have to remove the small bit of foam on the bottom under the lining to be able to get the Contact of.

You should never ever disconnect that device, it's designed to make a noise that scares away moose. ......................................Sorry but I couldn't resist it......................................

 

[johan]

You should never ever disconnect that device, it's designed to make a noise that scares away moose. ......................................Sorry but I couldn't resist it......................................

:x
D-mn it, i missed that on.
German engineering at its best!

 

[Fliz]

:x
D-mn it, i missed that on.
German engineering at its best!

Or should we say German engineering at its beast....

 

[ZuffenHouseRules]

Sounds metallic. Like metal vibrating on metal.

Not my 718, but 987 Boxster S had a metallic buzz in the exhaust in that approximate rpm range. I always imagined it as coming from the cat or muffler however I never really could isolate.

It was apparent on throttle-lift overrun. I think more noticeable with a cold engine/exhaust. It was not progressive, and never enough of an issue (for me) to warrant a dealer visit when still under warranty (maybe I was waiting for it to go away on its own....). And the noise did diminish over time although never entirely disappeared.

If this describes what you're hearing, definitely have it in to service for a listen while still new.

 

[johan]

On the 986 the heat shield over the cats come loose over time and start to vibrate at certain rpm.
If i remember correct it was around 2500, but it was a couple of years ago i fixed mine but somewhere around there i was.


The sound Aktor have alot dampening on it so even if it was loose it should not give a metallic sound, more like a klonking sound.

 

[Fliz]

Update:

So I had my car into the shop to get the 3K rattle/buzz checked out. The report stated that the sound was confirmed but that it is considered "normal" as the tech listened to another new 718S that he said also made the noise. To be sure, the tech also checked all the exhaust mounting brackets and made sure everything was tight.

I asked to hear the other 718S to compare for myself, but the SA suggested I go for a ride with the tech first to make sure it's the same sound. So, turns out my tech left for the day but the master diagnostician was available and we drove the car. He agreed that the sound was normal, saying that there is a lot going on in the engine with the timing advancing, turbo etc. He sounded very convinced so I decided to let it go and watch it until at least after break in. (I ended up not listening to the other car.)

I was driving the car today and it still bugs me so I'm hoping it goes away or I'll have it checked again after break in. I'm also looking forward to break in to be done so I don't have to shift at such relatively low RPMs (sound is most noticeable when you shift around 3k or happen to be right on 3k when cruising - when blowing through 2.9-3K rev range it's much less noticeable as you're through that zone so quickly).

 

[Ludo_718S]

Rattle/buzz

Hello All,
I am owning a Cayman 718S since November 2016.
It is a manual Gearbox with PSE.
I have the same type of rattle/buzz issue on my side almost from day one. It happens exactly at 2000rpm.
I complained to my Porsche Garage and returned the Car three times with no success.
I finally got a letter from Porsche France stating that the problem is known : the exhaust valve rod has an excessive slack driving PSE valve vibrations. For whatever reason, from what I can read on French forums, it looks like the issue is worst with manual gearboxes (compared to PDK).
On my side, I added a splitted metallic ring at the rod link. The vibration is reduced but still there. I Teflon ring would probably do a better job. I did not try yet.
Did someone found an other trick ?
Thanks.

 

[Viffermike]

Hello All,
I am owning a Cayman 718S since November 2016.
It is a manual Gearbox with PSE.
I have the same type of rattle/buzz issue on my side almost from day one. It happens exactly at 2000rpm.
I complained to my Porsche Garage and returned the Car three times with no success.
I finally got a letter from Porsche France stating that the problem is known : the exhaust valve rod has an excessive slack driving PSE valve vibrations. For whatever reason, from what I can read on French forums, it looks like the issue is worst with manual gearboxes (compared to PDK).
On my side, I added a splitted metallic ring at the rod link. The vibration is reduced but still there. I Teflon ring would probably do a better job. I did not try yet.
Did someone found an other trick ?
Thanks.

First: Welcome to the forum, @Ludo_718S !

Now: So your dealer indicated that this is an issue only on cars with Porsche Sport Exhaust (PSE)? In other words: Cars without that option (and, thus, without the valve on the passenger side of the exhaust just before the muffler) shouldn't have this issue? Just want to clarify this for the benefit of the forum.

Thanks!

 

[mab33]

A pic of what you did would be super useful. Thanks for sharing the info!

 

[R Doug]

I believe I have the same issue that you are describing. I did an oil change to my 718 before a track day and had the bottom engine cover off with room to roam around to find something loose. Later, I took it to the dealer and while they heard the sound and were able to recreate it, they too told me this is common amount other 718s.

My metallic rattle happens right at 2K RPMs no matter if I'm going up or down through the rev range. The noise is way more noticeable during leisurely accelerations and decelerations. When I'm "on it," I don't hear the noise at all.

I decided to mount my gopro in the back underside of the car to better capture the noise. Is this what you're hearing?

 

[phroenips]

I believe I have the same issue that you are describing. I did an oil change to my 718 before a track day and had the bottom engine cover off with room to roam around to find something loose. Later, I took it to the dealer and while they heard the sound and were able to recreate it, they too told me this is common amount other 718s.

My metallic rattle happens right at 2K RPMs no matter if I'm going up or down through the rev range. The noise is way more noticeable during leisurely accelerations and decelerations. When I'm "on it," I don't hear the noise at all.

I decided to mount my gopro in the back underside of the car to better capture the noise. Is this what you're hearing?

That video is awesome, thank you so much! I heard this exact same thing on my car today, and while I'm glad to know others have it, is there any idea as to what it is?

 

[johan]

That video is awesome, thank you so much! I heard this exact same thing on my car today, and while I'm glad to know others have it, is there any idea as to what it is?

is it at 2000rpm?
If Yes i guess you have a PSE, it is the valve that rattles.
Search the forum and you will find more info, but no 100% fix for it.

 

[phroenips]

is it at 2000rpm?
If Yes i guess you have a PSE, it is the valve that rattles.
Search the forum and you will find more info, but no 100% fix for it.

Thanks, that makes sense. I do have PSE, but wasn't able to narrow it down to any specific reproducible thing while driving. I'll have to take it back out again to verify it's at around 2000rpm

 

[alchall]

I have this exact same issue, my local dealer found no fault when I asked them to check it as part of a routine service; nothing out of the ordinary they said. I have PSE and it is much more pronounced when it's switched on, I can't say that it's absent when off, but definitely less obtrusive.

 

[Fliz]

The dealer's lead mechanic went for a ride with me and said the 3000rpm vibration was normal. They found me a brand new BS in the lot and we fired it up and sure enough, it made the same metallic vibration sound right at 3000rpm. So, I suppose it's at least common. I still don't like it but luckily I don't notice it much with the top down, which is most of the time here in California.