Waterboxers don’t have a cold start valve. That buzzing thing in the center of the idle is the idle control valve. It is an engineered add on to compensate for O2 sensor mixture changes, warm up fast idle, and varying loads. The controller is located in front of the passenger side tail light. It shares the temp 2 sensor with the ECU for warm up idle and it also has inputs for power steering pressure and the AC compressor. It get power when the ignition switch is turned on. 

Dennis 

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Thewestyman
Sent: Friday, May 31, 2013 8:49 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Cold start valve

That thing in the middle of the engine, I think it’s called the Cold start valve, is still buzzing, running after I switched the car off and pulled the key out.  Something is going on, because it also won’t start now.  I hope, I don’t have something strange.  
Anyone?
Z