Can someone elaborate or re-direct to a thread that explain how "cracking an injector line" assists in diagnosing a faulty injector. Not to hijack the thread but also in hopes of further explaining/diagnosing how this procedure works and the original poster....

I know that my my OM606 there is at least injector that has been consistently nailing ever since I bought the car but clears up once warmed up. When just loosening the nut on the metal injector line at the injector, does that essentially shut down that cylinder and resulting in no new/current combustion noises?

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#dieselFLEET
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'97 E300
'99 E300