I don't know if this is relevant ?

I've owned a 2.0 Passat GL5, a 100 GL5E and a Coupe 2.2. All 3 used to turn over and over before they fired up, if at all! On all 3 I disconnected the cold start valve and found they started much better in all conditions. A VW/Audi specialist said that the 5-cyl engines didn't need over fuelling even in colder conditions.