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When does the noise occur, while driving only, or driving and idle, in gear, or in neutral and park? If it occurs all the time (while driving and at a stand still in cold weather) it could be the fuel pump. If it occurs only while driving, it may be a wheel bearing. Describe the noise (humming, grinding, whirring, etc), and what is the mileage on the Pilot? Answer my questions so I can fine tune my answer. Thanks!
Check your Control arm bushings and or your ball joints. The bushings are known to wear out easily and the replacement control arm with ball joint included is only around $150.00. You can check the control arm by putting vehicle on jack stands and with a pry bar pry between the frame and control arm. If there is excessive movement then replacement is required, also when the car is in this position try to pivot your wheel top and bottom(in and out) and this checks the ball joint.
the sound is comming from your intake
has your air filter housing been modified in any way or is it missing a part?
what you are hearing is the idle air control solonoid opening up and allowing alot of air into the engine .