Check out what Jeffsr had to say in this post. It may apply.

http://www.peachparts.com/shopforum/showthread.php?threadid=6315&highlight=cold+start+valve.

Use the SEARCH facility for misc. 190E questions. There's been a ton of info posted here for this model.

__________________
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"