Humming Noise In Engine???
11-01-2004, 02:13 AM
#1
MBWorld Fanatic!
Thread Starter
Join Date: Sep 2004
Posts: 1,299
Likes: 0
Received 0 Likes
on
0 Posts
Humming Noise In Engine???
Hi guys, I was just wondering if this happens with your cars: Lately I've noticed that whenever I come home and turn off my car, I hear a faint humming noise coming from what seems to be the alternator. 
I noticed it for the first time yesterday and I popped my hood to see where it was coming from. It sounds like some sort of electric current, and I've never heard it before. Again - it sounds like its coming from the alternator, and thats understandable given that it sounds like some sort of electric fault. It goes away after about 30-60 seconds. I was just wondering if anyone had any idea what it is or if it happens to anyone else's car. Any help is greatly appreciated. Thanks!
I noticed it for the first time yesterday and I popped my hood to see where it was coming from. It sounds like some sort of electric current, and I've never heard it before. Again - it sounds like its coming from the alternator, and thats understandable given that it sounds like some sort of electric fault. It goes away after about 30-60 seconds. I was just wondering if anyone had any idea what it is or if it happens to anyone else's car. Any help is greatly appreciated. Thanks!
11-01-2004, 04:18 AM
#3
Senior Member
Join Date: Oct 2004
Location: Hertfordshire, UK
Posts: 271
Likes: 0
Received 1 Like
on
1 Post
ML 320 CDI
Mine does this and has done since new. I normally don't notice it but if you turn the engine off, remove the key and sit there you will notice it.
I have no idea what causes it though.
I have no idea what causes it though.
11-01-2004, 09:16 AM
#4
Senior Member
Join Date: Oct 2004
Location: Collegeville, PA
Posts: 377
Likes: 0
Received 0 Likes
on
0 Posts
05 E55, 03 Z4 3.0
Could it be timed oil cooler for the SC? My S4 used to do this if the turbos were too hot, and I turned off the car, an oil cooler kicked on that ensured the turbos would cool down more gracefully than a fast shutdown.
11-01-2004, 09:59 AM
#5
Member
Join Date: Jul 2004
Location: Boston, MA
Posts: 123
Likes: 0
Received 0 Likes
on
0 Posts
2001 BMW M5
I have heard this on the E55 as well. It seems to come from all the computer controlled gizmos on the right side of the engine compartment. It did not sound like an alternator to me though. Maybe you are experiencing someting different?
11-01-2004, 08:28 PM
#6
MBWorld Fanatic!
Thread Starter
Join Date: Sep 2004
Posts: 1,299
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by DRCrowder
Could it be timed oil cooler for the SC? My S4 used to do this if the turbos were too hot, and I turned off the car, an oil cooler kicked on that ensured the turbos would cool down more gracefully than a fast shutdown.
Originally Posted by TCM
I have heard this on the E55 as well. It seems to come from all the computer controlled gizmos on the right side of the engine compartment. It did not sound like an alternator to me though. Maybe you are experiencing someting different?
