Hello, I’ve been driving a W123 CE 230 for 7 months and I’m very happy with the car. I only have one problem: If the engine is cold and I want to start it, it starts hard. After it starts, there are slight vibrations in the engine, but they disappear as soon as the engine is warm. Sometimes I have to try to start 3–4 times until the engine starts.(Twilights are new) In my environment, I was told that it could be a cold start valve, and that the metal pin should go back to it in cold weather, which might not work any more. I would like to check this, but I don’t know where this valve is. Can anyone help me? Thank you!