[Mrmerlin]

from the info you provided you need a rebuild on the LH ECU computer,
with the key on and not cranking the injectors should not make any noise.

Reference JDS Porsche for diagnostics

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=4&ved=0CDcQjBAwAw&url=http%3A%2F%2Fwww.jdsporsche.com%2Ffault%2520fi nd.html&ei=fps5UL3GGJS-9gSY9oFI&usg=AFQjCNG6KP07HDxxqkFn1PE6-UcFcSxyZA&cad=rja