PDA

View Full Version : Whistle at startup


mclovin
01-04-2010, 09:34 AM
Morning everyone,

Recently when we'v been having -10 weather these days, i'd get a loud whine/ whistle from the engine bay at cold startup. Sound goes away after few minutes of idling. Dont know if this would help or not but also theres this burnt smell coming from exhaust when its cold. Things i'v changed so far are idle/adjust pulleys and both belts. Any ideas?

harman_rai
01-04-2010, 09:57 AM
i have the same problem and i had my belts and pullys changed last year

Eurostyle
01-04-2010, 01:09 PM
Common problem, its from the auxilary air pump...they start to whine when they get old. They only work at start up, so noise goes away soon. Chances are it will stop working soon!

mclovin
01-04-2010, 01:17 PM
Realy? Car has only 80k on it tho lol

slemmer
01-04-2010, 06:36 PM
So what happens if the aux air pump fails? Is it only for emissions?

Steve30
01-04-2010, 06:43 PM
yea for cold start emissions

richie_s999
01-04-2010, 09:14 PM
My 325is is making that noise and also finding some weird vacum leaks at cold temps too, can hear them under the hood and seem to be coming from around the pump. All goes away once it is warmed up. Would make sense it's around that air pump with the cold weather. Hope to get some time next weekend to look at it

mclovin
01-05-2010, 09:39 AM
*Update

So i had a time to pop the hood this morning after starting the car. Sound isn't coming from the pump area, its coming from the drivers side. Its either alternator or adjust pulley which has been changed 3k ago. Most likely alternator. Is there anyway of getting rid of it without having to replace the whle alt?

InfiniteDice
01-05-2010, 10:30 AM
Alternator most likely.

mclovin
01-05-2010, 10:34 AM
And theres no way of diy replacing the bearing in it huh. best bet is to live with it or replace it with new one

uber e36
01-05-2010, 11:03 AM
I bought a rebuilt alternator from a guy in MTL that is/was a vendor here on the boards...

Eurostyle
01-05-2010, 11:43 AM
Also check power steering pump, it sits in the same area...and they can make noise at cold start up.

BmW1819
01-06-2010, 12:15 PM
it's sounds like your alternator pulley really easy to change . 16 wrench/socket out she comes :) stick a screw driver and put your ear on it when the car is running make sure u don't drop the screw driver and have a listen or poor small amount of water on it should go away for 5 seconds if it was changed 3k there is 3 pulleys on your car did they change all 3?? to elimate the ac pulley put on your ac and see if the noise get louder

mclovin
01-06-2010, 03:11 PM
it's sounds like your alternator pulley really easy to change . 16 wrench/socket out she comes :) stick a screw driver and put your ear on it when the car is running make sure u don't drop the screw driver and have a listen or poor small amount of water on it should go away for 5 seconds if it was changed 3k there is 3 pulleys on your car did they change all 3?? to elimate the ac pulley put on your ac and see if the noise get louder

Pulley? I thought its the alternator bearing that goes, which is inside the alternator.

The last pulley is by the a/c and the sound isn't coming from that area.

BmW1819
01-06-2010, 06:19 PM
u change the tensioner/ pulley and alternator pulley?? alternator at 80,000 that shitty :(

low_bmw
01-06-2010, 06:53 PM
my E46 does the same... i dont think its anything to be worried about. mine did it last year too. only in the cold. sounds like its supercharged right?

mclovin
01-06-2010, 09:38 PM
no only adjust/idle

it seems to be doing it now even if its in the garage. Getting somewhat annoying lol

Qube
01-06-2010, 10:05 PM
Starter solenoid?

mclovin
01-07-2010, 02:40 PM
So i start the car today and theres no whining/whistling anymore :huh?:

Temp this morning was -6.

Weird. I'll update if it gets worse or if i find solution.

Ceeker
01-07-2010, 04:09 PM
don't worry bout it. Spray the back of the pulley with crown or some lub if you can to get it to stop or don't. Personally think it's a useless piece of crap and really don't need it. if it craps out, just disconnect the belt.

BmW1819
01-08-2010, 11:30 AM
yea wait till it gets worse where it happens all the time :)

kkm
02-02-2010, 09:31 AM
I had exactly the same symptoms. First whistling, then bearing grinding type noise coming from the alternator, no noise for a week, now alternator is shot.

Mikeee46coup
02-03-2010, 09:16 PM
E46's also suffer from cracked intake hoses that can cause whistling; this will be the culprit if the sound is high pitched and related to throttle engagement (when you're coasting it makes no noise).

aaron320i
02-03-2010, 09:36 PM
E46's also suffer from cracked intake hoses that can cause whistling; this will be the culprit if the sound is high pitched and related to throttle engagement (when you're coasting it makes no noise).

even an e46 with a cold air seems to make the whistle but in his regard its just durring warm up.