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Message: <blockquote data-quote="moots" data-source="post: 642698" data-attributes="member: 219">woahhh....this CSV setup looks purely mechanical as opposed to my previous e30,also an L jet,which had an elect vlv located at the inlet manifold.A CSV is just that.it assists starting on cold days.it is like a choke from cars of yesteryears where it needs to be pulled.but on yours it is auto and is controlled by water temp.we don't actually need this and it's ok to have this bypassed.but you may have to mod the valve to 'permanent close' becoz i am guessing that the valve provides an additional fuel supply thru a valve with engine cold and closes up gradually as the engine heats up.if you leave the vlv open by bypassing the sensing of water temp,then the engine may run rich all the time.good luck</blockquote>