Make sure the cold start valve is working properly and not seized up.
Yes the reason for that is because the engine is over heated and when its cold the engine is nice and cold perfect for starting conditions.
May be (probably) the cold start valve. I'm not sure how to check it to see if that's the problem. They are expensive even if purchased aftermarket. Good luck!
check the heater control valve it should be 10 ohms of resistance
Pole to Pole - 1992 Cold Start 1-1 was released on: UK: 21 October 1992 USA: 10 January 1993
Most diesel engines are hard to start when it is cold. Plugging the diesel engine block heater in will help the engine start.
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Does the engine turn over but not start or it does not turn over till cold? If the latter is the answer then your kick start is the problem. REPLY The car turns over but wont start.
The 1985 Mercedes 190e could have a stuck choke. Check the choke mechanisms to start with, to see if that's the problem.
Because it is winter, it is cold and you have a diesel engine. They use glow plugs to help ignite diesel in cold weather. Have the glow plugs checked.
Weak battery.
Remove the Air cleaner completely and you will see the Cold Start Valve underneath with the wiring plug attached to it. You can instantly recognize this valve from the Allen Key screws that bolt it on to the manifold. John T
You need a new battery