bt55krc

I too never hear the ticking when the engine is turned off. Problem solved!! ;-)

SpyderSenseOC

I wish mine were that close to what I would describe as ticking. Listen to my video several posts above. Mine chirps and I can make it come and go on command. When it does stop making the sound it does so so instantaneously that I have to believe it is electronically actuated in some way.

h_4711

There's no ticking at all. What you hear is the normal sound of gas exchange, combustion and exhaust. When slowed down to 20 % you can hear an additional periodical sound of about 15.000 Hz, which is near to audible recognition limit at normal speed. It probably is produced by the piezoinjectors of the cylinder bank near to the microphone.



This is a nice example of a non-ticking 982 - 4.0. It proves that oftenly complained idle speed ticking (about 3000 Hz) is NOT NORMAL and NOT part of the package.

9-X-I

Not sure if we're talking about the same thing?
I'm wondering what are the random chirps that sound like heat pings.
The periodic and rhythmic sound similar to sewing machine is kind of normal or at least more commong among the owners.
These chirps are not.

h_4711

Sorry, but I can't safely determine any random chirps in your 11 seconds lasting soundfile.
Can you post the time position(s) within these 11 seconds, where you believe to hear uncommon random chirps ?

9-X-I

First one is right on the start. Then at 1,5 seconds you have two. Then two again at 5 and one at 7, 9 an and 10.
There are 8 chirps altogether.

h_4711

Hi 9-X-I,
compliment on your good ears !
After your time specifications I could identify the "chirps" in your soundfile.
For me the chirps are much better to hear, when the sound is slowed down to 1/4 (25 %) .
Attached you find a modified soundfile and a video with the speed slowed down to 1/4 and an additional bandpassfilter
2100 Hz - 2400 Hz.
Soundtrack pictures show the 8 chirps and parts of the soundtrack with stretched times.
Chirps are random (as you wrote), have a frequency of about 9200 Hz and a duration of about 17 ms each.
Loudness differs significantly (if the microphone was not moved).

What is the reason of this noises ?
I actually really don't know. I have to think about it. Will check the soundfiles regarding my GTS 4.0, if there are similar chirps, I didn't identify up to now.

SpyderSenseOC

That is definitely not the same as the incessant chirping I'm talking about. Yours I would describe more as a click due to it not being a high pitched sound. And yours is far more random.

9-X-I

Haha, thanks. Not proud of that. On my first drive I heard a squeeky noise when opening the door (engine turned off). That too got my attention.
The recording isn't the best, it was made quickly with a telephone.
Thanks for the modified file and additional files!

Yes, this is random. I thought if this might be a little stone dancing somewhere in the exhaust system and will pop out eventually. But probably I'm wrong.
We'll see once I get more miles!

UncleDude

Man, you guys are in the weeds on this topic. I don’t want to be the “get out and drive” guy but I’m getting close lol.

Chester7

If a line looks straight, it is straight. And if an engine makes a noise, the engine is making a noise. No amount of hand-wringing and hypothesizing is going to make the noise go away.

SpyderSenseOC

While all that may be true, collective minds theorizing about the same thing often result in a resolution or an answer. That’s how technical service bulletins come about.

SpyderSenseOC

My car is going in this week for a meeting with my dealer tech friend. He has some information and some theories that I hope will culminate in a solution. I'll update as I get more.

tigerhonaker

I'll be following you on that ^^^ ...................

T.

kmh0277

I've had ticking from the injectors and also a leaf that got sucked into the side intake and was being clipped by the fan. I was able to carefully remove the leaf with a vacuum attachment.

Anything beyond that is probably needs a visit to a shop/dealer.