Just replaced the injectors on 180k mile 95 e300 diesel non turbo. It was quiet before but with some cold running issues. The cold running issues are still there, once warm the engine pulls better than it did with the old injectors but it is noisier at idle with what I think is called nailing - loud clanging that I can also feel pulsing through the metal fuel pipe from the IP to the injector.
What is causing this and is it possible to get rid of it?