Why is my 190E hard to start when cold?

A hard start in your 190E when cold could be due to several factors, including a weak battery, faulty spark plugs, or issues with the fuel delivery system, such as a clogged fuel filter or a failing fuel pump. Additionally, the cold start valve or the engine coolant temperature sensor may not be functioning correctly, leading to improper fuel mixture. It's also worth checking the ignition system and ensuring that the engine's air intake is not restricted. Regular maintenance can help identify and resolve these issues.