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Most often these noises are lifters. In your case, while you may be able to hear the injectors, could you not also be hearing a lifter? I expect that using your technique, you would be able to hear the injectors in any NG900 that did not any ticking noises.
A likely cause would be noisy valve lifters. There are 16 of them. You would only need to have one acting up to get a ticking sounds. I had this one, while running on Castrol Syntec, which is not a true synthetic oil. I tried some solvent type additives which claim to free up things that stick, such as lifters and rings. Also tried some top lube in the fuel.
When I had the ticking in my engine, I would hear it after the engine was fully heated up. I could hear it at idle with the doors closed etc. This improved the signal to noise ratio. Standing near the engine with the hood up, I could not really hear it. My wife when asked to get in and listen did not hear it for a while until I started drumming on the dash with my finger in sync with the rythim of the ticking.
It is hard to say if this was sticking valves or the lifters. But the root cause would be deposits.
I don't have this noise any more, and I also use Mobil One which is a fully synthetic oil, not a highly hydrocracked base stock which is passed off as synthetic. Guess who is making the most profit, the oil that is fully synthetic, or the one with modified dyno oil that is sold for the same price as the real thing?
As for injectors acting up after cleaning with Techron. After a highway run, pull the plugs and look for any evidence of cylinder to cylinder variations in deposits and color. If they look the same, then whatever is wrong with the injector(s) is not affecting combustion.
posted by 208.24.17...
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