I own a g35 05 sedan and theres this noise more like a rattle that is driving me nuts. It only happens at acceleration about 2 rpm's than it goes away and I notice it better if you put it on D and set the breaks and accelerate, you can definitely hear it clearly and again at 2 rpm, even the dealer can give me a minimal answer to what it can be . Can anyone help thanks!! Ive try the following (Change the compressor rod bushings, mass air flow sensor and various Diagnostic @ infinity dealer!! I always do the oil change @ 4k miles and use mobile 1 full synthetic oil plus premium gasoline).

 

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