nizzle

Today my 04 E55 started making a weird humming / buzzing noise that I can feel in the floor board. I have aftermarket amps in the car and there is a noise that now comes thru the speakers that directly correlates to this new "vibration" or "buzzing" that i can feel. I unplugged power from the amps and the noise stopped coming thru the speakers. However, the origin noise and vibration/buzzing feeling is still there. i can feel and hear the noise more when i put the car in gear. Any ideas?

nizzle

bump, sounds electrical but I'm not sure. Almost like that transmission pump sound at start up but it doesn't go away. Gonna have to take it to the stealership for diagnosis but I'd just like some ideas of what it might be if anyone has any

nizzle

Bump. Wow no ideas anyone? Have any questions to help think of ideas?

bstudey01

Does the noise through the speakers increase in frequency with more RPMS? If so that is alternator whine and is generally caused by a bad ground or too small of gauge ground wire.

bstudey01

Have you had exhaust work done? MAybe something is loose like a heat shield or exhaust manifold??

nizzle

Yes does change with rpm's but I have 0 gauge(HUGE) ground and power wire. I did think alternator going bad but would that create vibes in the floor you think?

E55Greasemonkey

Kinda hard to diagnose a noise over the internet

I'll take a shot:

Does it sound like rocks tumbling in your center console, but fast?

nizzle

Sounds more like an electric motor running/buzzing or even a "moan".

nizzle

another morning bump

nizzle

I think it might be the alternator going bad.

nizzle

Yep, it was the alternator.......... Fixed