I don't thing we have any Bio here in Yuma, AZ sadly, but I do always have a Scangauge II hooked up so the code was obvious P0243 i think it was. I did just try to isolate the noisy injector by loosening the injector line on each injector. Number 4 seems to quite it down the most but then again they all seem to quite it down. Time for delivery valve seals and springs?