I have not used a noid light, but agree that trying to run the engine with one whole bank disconnected could stress it. This problem lead me to think the same approach as doing a compression test would be appropriate.

I am assuming you are prepared and capable of clearing and resulting codes from this procedure - from the other thread it sounds like you have the gear.

Start by pulling the fuse for the fuel pump and then start the engine and let the engine run until it dies without fuel. This should remove fuel from the system and keep you from dumping extra fuel into the oil if you crank it without starting. You can then pull the control box off the whole bank of injectors, hook up the noid light to whichever one you want and watch it as someone cranks the engine over. Typical behavior would be some stronger pulses during cranking followed by some more rapid but weaker pulses. I am not sure the pattern matters to you, as you just want to see if the injector is getting a signal to fire.

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles