2005 E320 CDI, i've got an idling misfire/ missing issue that almost feels like fuel starvation to the injectors that I've traced back to either the fuel pressure regulator (Y74) or quantity control valve(Y94).
Y74 is the screw in style mounted on the back of the rail, shown in the attachment below. I've heard that this valve isn't changeable on the rail?! That you have to change the whole rail?! That cant be true. The valve itself is readily available. Its not like the rail is cast around the valve?! It threads in! Is there any truth to this? Or is it hogwash?
P/N for the pressure regulator is 648 070 00 46
Y74 is the screw in style mounted on the back of the rail, shown in the attachment below. I've heard that this valve isn't changeable on the rail?! That you have to change the whole rail?! That cant be true. The valve itself is readily available. Its not like the rail is cast around the valve?! It threads in! Is there any truth to this? Or is it hogwash?
P/N for the pressure regulator is 648 070 00 46