Weird Noise, need help!

eRa11 · 10-20-2012, 12:16 AM

Hello need help identifying a noise my car started making. its an 04 325i, around 93k miles on it. The car makes those high noises when started after being off for hours, usually mornings or after work. Also i started hearing the noises when the weather started to get cooler, not sure if it has any kind of relation. The noise persists when slightly stepping on the gas sometimes it even gets higher it goes away at about 4k rpm. This goes on for a couple of minutes then goes away. Figure i would post here first hopefully get suggestions as to what the problem may be before taking it to a mechanic and start throwing money. many thanks in advance.

lucky_doggg7 · 10-20-2012, 03:04 AM

If I were to shoot from the hip, i's say it's a pulley bearing that's failed.

BimmItUp · 10-20-2012, 04:31 AM

Got 100% same noise!! Still tracking it down. So far I have narrowed it either alternator bearing/pulley or idler pulley. If its not that then I've read the tensioners can go bad as well.

jjamal99 · 10-20-2012, 06:33 PM

I have the same problem as well. I changed both of my belts to no avail. I'm gonna try the belt tensioner next and maybe alternator pulley.

10-20-2012, 12:16 AM	#1
eRa11 Registered User Join Date: Sep 2012 Location: Houston, TX Posts: 2 My Ride: 325i View My Garage	Weird Noise, need help! Hello need help identifying a noise my car started making. its an 04 325i, around 93k miles on it. The car makes those high noises when started after being off for hours, usually mornings or after work. Also i started hearing the noises when the weather started to get cooler, not sure if it has any kind of relation. The noise persists when slightly stepping on the gas sometimes it even gets higher it goes away at about 4k rpm. This goes on for a couple of minutes then goes away. Figure i would post here first hopefully get suggestions as to what the problem may be before taking it to a mechanic and start throwing money. many thanks in advance. Last edited by eRa11; 10-20-2012 at 12:17 AM.

10-20-2012, 04:31 AM	#3
BimmItUp Registered User Join Date: Mar 2007 Location: Washington - PacNW Posts: 239 My Ride: 01' 330i View My Garage	Got 100% same noise!! Still tracking it down. So far I have narrowed it either alternator bearing/pulley or idler pulley. If its not that then I've read the tensioners can go bad as well. __________________

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes	Rate This Thread
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode	Rate This Thread:

10-20-2012, 03:04 AM	#2
lucky_doggg7 Registered User Join Date: Mar 2008 Location: OC Posts: 282 My Ride: 2005 M3 View My Garage	If I were to shoot from the hip, i's say it's a pulley bearing that's failed.

10-20-2012, 06:33 PM	#4
jjamal99 Registered User Join Date: Jun 2011 Location: Northern Virginia Posts: 47 My Ride: 2006 BMW ZHP View My Garage	I have the same problem as well. I changed both of my belts to no avail. I'm gonna try the belt tensioner next and maybe alternator pulley.