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Bose Stereo Harley sounding engine noise from speakers

28 July 2011
Does anyone experience this problem? Whenever I am playing FM I hear this popping engine noise sound like a Harley motorcycle from my speakers. The sound popping sound is consistent with engine revolution. I have Grom adapter installed to play my Ipod it sounds clean I dont hear the engine noise from AM either on ly on FM. First I thought it was a antenna issue then I change my antenna to shark 2 the sound is still there. And recently I noticed the the volume is very low till you past middle then it will get louder it seams not normal.

Could it be a ground issue, ignition coil, amp going bad? Please help