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Ask better questions, get better answers. There is literally a thread discussing cleaning the internals of the sprockets recently active. So obviously there are quite a few of us who have cracked these open.
Yes, you can do one bank at a time as each bank has it's own timing chain and tensioner. Though if you have one cam sprocket doing it you should probably replace all. It is caused by contamination. I would also pull the cam carrier off the head and check the VVT filters in the oil passageway. Those can get plugged too. I would personally swap VVT solenoids around first and see if the problem moves before pulling the engine.
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"Experience is the hardest kind of teacher. It gives you the test first and the lesson afterward." -Oscar Wilde.
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