190E cold start problem

hope someone can help ...
my 190E 1.8 (1992) runs perfect but refuses to start in the morning until i've cranked the engine for a full 8 or 9 seconds. during the day - when
the motor is warm - it always starts instantly, less than a couple of seconds.
is this a common thing with these engines (M102)?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.