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Since the tranny is on the other side and the driveshafts are not moving at idle, it is something motor related. On that side you have the engine accessories (water pump, A/C, PS) idler pulleys, and the timing chain/gears and balance shafts.
Try loosening the idler pully and starting the engine for just a few moments. Do it with a "left overnight" cold motor since you won't have a water pump running with the belt off or an alternator. See if it makes the sound. If it doesn't make it with the belt loose, it's an accessory. If it does, it's the timing chain or balance shafts (much less likely). If it seems to be an accessory, with the car shut off check each pulley for play by moving it around with your hands. The one that is causing the problem is usually obvious.
posted by 71.174.89...
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