E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > E46 BMW > General E46 Forum

General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

Reply
 
Thread Tools Search this Thread Rating: Thread Rating: 1 votes, 5.00 average. Display Modes
Old 10-04-2012, 06:31 AM   #21
Davinci323iE46
Registered User
 
Join Date: Oct 2012
Location: Australia
Posts: 12
My Ride: Bmw 323i e46 1998
Alright i tried everything that has been mentioned in the above comments and have come to the same conclusion that the Alternator whine is still there! any other ideas?
Davinci323iE46 is offline   Reply With Quote
Old 10-04-2012, 09:02 AM   #22
jfoj
Registered User
 
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 11,593
My Ride: '06 330CiC, '03 M5
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 - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
jfoj is offline   Reply With Quote
Old 10-04-2012, 09:05 AM   #23
Davinci323iE46
Registered User
 
Join Date: Oct 2012
Location: Australia
Posts: 12
My Ride: Bmw 323i e46 1998
Thanks jfoj, i actually tried that today and there is no whine! It is amongst the head unit somewhere that the whine is being picked up!
Davinci323iE46 is offline   Reply With Quote
Old 10-04-2012, 10:26 AM   #24
jfoj
Registered User
 
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 11,593
My Ride: '06 330CiC, '03 M5
Easy way out are RCA ground loop isolators? Parts Express:com?
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
jfoj is offline   Reply With Quote
Old 10-04-2012, 11:07 AM   #25
Davinci323iE46
Registered User
 
Join Date: Oct 2012
Location: Australia
Posts: 12
My Ride: Bmw 323i e46 1998
Sadly enough i have tried Pac ground loop isolators and they did not work!
Davinci323iE46 is offline   Reply With Quote
Old 10-04-2012, 02:48 PM   #26
jfoj
Registered User
 
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 11,593
My Ride: '06 330CiC, '03 M5
It really boils down to a few basic issues.

1. You have a trashy output from the alternator, could be due to loose/dirty/poor connection(s) or an internal problem with the alternator diode bridge.

2. Your head unit had very poor DC input filtering and/or is connected in such a way there is a bad ground, a ground loop or in some way it is sensitive to picking up and amplifying alternator ripple.

3. Your interconnects between the head unit and the main amp have bad shielding, bad grounding or somehow is causing a ground loop.

You may need to isolate your head unit, you may need to remove it from the dash and make sure the metal chassis is not touching anything.

You could temporarily connect the head unit in the trunk at the main amp and connect it to the same power connection as the main amp. This should cure you temporarily from any noise. The slowly work the head unit back to the front of the car, possibly even powering the head until from the same connection as the primary amp.

Again, ground loops are likely the issue, however, without hearing how bad the noise is, it may be actually be a bad diode in the alternator putting out too much AC Voltage??
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
jfoj is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Censor is ON





All times are GMT -5. The time now is 03:01 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
(c) 1999 - 2011 performanceIX Inc - privacy policy - terms of use