2004 mustang with mach audio I CAN HEAR MY ENGINE RUNNING IN MY SPEAKERS

[comporange2004]

I HAVE A STOCK MACH SOUND SYSTEM AND I CAN HEAR MY ENGINE RUNNING IN MY SPEAKERS, WHEN I RESTART MY CAR IT GOES AWAY FOR A FEW MINUTES BUT THEN IT COMES BACK, ITS DRIVING ME CRAZY PLS HELP,AND PLS DO NOT SAY UPGRADE I WANT TO KEEP IT ORIGINAL, IM LOST.

 

[DavidPR]

It is faulty grounding. Check the grounding cable from the head unit.