Mercedes W220 S320 cdi 2004
Greetings Oliver!I hope you can find a solution to the problem. I had very similar issues with my 2004 S500. I also replaced all 4 struts and tires.
The mechanic eventually told me to basically just put up with it. In all fairness I think he was tired of looking at it.
I know for sure it was a real issue though. One day I was driving on the highway/motorway and I hit a small pot hole. All of a sudden the soft ride came back and the car felt amazing - so smooth. However, the next time I stopped/started the engine, the symptoms came back.
So I think the bump reset/re-seated something temporarily. I was always tempted to replace the cables that connect to the struts.
Like you and the others, I had the car hooked up to SDS multiple times - never any airmatic errors. It was a real mystery.
My Dad had a 2004 S320CDI back in England, and even with his larger 18" AMG wheels, his ride was so much softer than mine on the factory 17" wheels.
Thanks for tuning in to this long-running thread. It seems like an Epic at times
Like you, I've had various Indies / Techies etc saying 'it rides ok (?) / live with it' etc but I suspect that they also didn't have the time / expertise / patience to get to the root of the problem. To be fair, these cars and the Airmatic / ADS set-up are pretty complex so I can understand that - to a degree.
Interesting to hear about your intermittent hard damping symptoms and likely cause. From the start on my 'S' I've wondered if I have a similar issue: i.e. 4 x SDS when stationary shows 'no Faults / codes'. The only difference is that my hard damping has been constant throughout.
From what you (and wallyp here) say, it does now sound like an electrical 'glitch' which throws the ADS in to Safe / Hard mode: but for some reason doesn't reveal itself on SDS. So it could-well be something as 'simple' (?!) as a corroded / shorted in the wiring harness or even a faulty 'Sport 1/2' switch? So... having eliminated 'bad' struts (at some cost!), more exploratory work on that side of things. (Check Supply Voltage to struts etc?).
Sincere thanks for your interest and input Oliver. It's good to be reassured that I'm not 'Losing the Plot' / Imagining things etc!
Best wishes from the UK and 'To be Continued'....