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rattle under boost


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Been having a faint rattle come during boost, no matter how high. Even at 1psi there is a rattle. seemed to pop up after i started having another rattle in my AC if i idle for a while w AC on, when it cycles a rattle/whirring sound eminates from dash but cant be heard outside w or w/o hood open. is it possible the 2 are correlated? any thoughts on what could be loose/cause rattle? more concerned with boost rattle over AC noise
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not rod knock, had that before and know what that sounds like. i could replicate that while at idle and gently revving. this only happens under boost under load. i feel like something somewhere is loose, but before going crazy and taking things out and re-tightening just want to see if anyone else has had this and can offer up a starting place to look
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hit and hold boost fine. no stutter, no excessive lag. now that im aware of the noise, its more of an annoyance since im always listening for it now. im going to check the heatshield this weekend and make sure thats all tightened and also look at the wastegate, make sure thats kosher. any other insight in the meantime?
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