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Old 10-04-2012, 09:02 AM   #22
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 16,591
My Ride: 330CiC, M5, X5
If it is not a power issue, then likely ground loop between head unit & amp.

Get a 1/8 stereo plug to RCA male cable and hook iPod, iPhone or Droid phone directly to amp and see if noise is gone. CAUTION, TURN VOLUME WAY DOWN ON PORTABLE DEVICE!

This isolates head unit from amp and rules out dirty power to amp.
Solve your misfires, lean codes, rough idle -

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