Hello Forum,
I would like to hear your experiences on the subject of ticking in the upper valve cover area. It is very prominent on mine. i had a suspicion at first that it was the valves themselves. However, I checked the valve clearance and they are set correctly. I then recorded an audio file, isolated the ticking and determined the frequency. It is exactly the idle speed of the engine, which really only leads to one conclusion. It is the injectors, which are activated once per revolution. But I still find it surprising that they are so loud. I don't have a lot of comparisons, but I think mine ticks particularly loudly.
Can you also observe this with yours? Or is there another cause? By the way, the ticking is very identical on the left and right. The right side is a bit louder, but the fan doesn't shield anything.
Attached you can find the audio streams (mp3 files, are compressed in a zip). I recorded the sound directly in the engine compartment at the right valve cover. In the picture you can see the isolated frequency. If you look closely, there are several peaks on top of each other, which could be the individual injectors.
Greetings
Fabian
https://www.dropbox.com/scl/fi/6aimemd9gnz97wrifu2sk/Archiv.zip?rlkey=7ayvwa9gv44k114m3cel6dpk7&dl=0
