Doesn't sound like metal on metal to me and the frequency is to high, I've heard solenoids make that kind of sound.

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).

Kind of sounds like metal on metal in person, but I’m not sure. It’s a brand new solenoid from Mercedes and makes the same exact noise that it did with the old solenoid on it so I don’t know. I’ll post another video with hopefully a little better example of the sound.

Here is a longer video where you can hear the tap/noise as I accelerate. The noise stops around 11 seconds into the video when I let off the throttle a bit and maintain cruising speed.

https://youtube.com/shorts/dqJqdkndMsE

And here’s a link from the garage tonight. I guess there’s something off with the timing. I’ve looked all over the internet and I guess I’m the only one that’s ever had this problem.

The little rattle you hear at the beginning is the tensioner making a little noise. It’s definitely a metallic sound when I rev the engine and the solenoid is energized. So I guess I need to check the timing chain to see what’s going on. Thing is I don’t know what I’m doing with these so I’m not sure what I’m looking for. Could be something wrong with the advance sprocket or system. Again not sure I know what to look for.

https://youtube.com/shorts/8IkQ288Pbsw?feature=shared

If anyone has any further ideas please let me know.