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Old 04-09-2015, 02:02 PM   #1
mmmdddmmm333
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Join Date: Jul 2011
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High pitched whinning sound



Hello everyone,
I have a 2001 330ci and I noticed throughout the winter that when the car was cold I could hear a high pitched whiining sound inside the car. It was very high pitched and only lasted for 5 to 10 seconds at a time. Now as the weather is slowly warming up, I've noticed the noise on the outside of the car when the windows are down. I have no idea what makes this noise or if it's common for this model. The only thing I could suspect is a spededomoter cable, but I dont even know if this car has one !!.
Any Help or suggestions to check would be greatly appreciated.
Thanks.
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Old 04-09-2015, 09:02 PM   #2
ghd
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I have a high pitched whine from the engine as revs get up a bit in the cold; goes away when I put the clutch in and coast.
I put it down to a pulley bearing, but don't know which one.
Could be belt tensioner or idler are alternator, or something.
Plan to investigate now that it's warmer out for working on the car.
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Old 04-10-2015, 01:45 AM   #3
jabela
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Yea, pretty sure there's no speedo cable.

If the sound is in the inside, it may be your blower motor/fan.

If it's the outside, it could be one of your pulleys.

It could also be wind whistling

Does it vary with vehicle speed? Engine speed? Gear? Blower fan speed? Does braking affect it?
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Old 04-13-2015, 11:00 AM   #4
mmmdddmmm333
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I've already changed the idler, and tensioner pulley as well as the water pump. I guess that leaves the alternator. Also, my blower fan does make some noise but its a different noise altogether. The whinning does go away at higher revs and then comes back when I shift and and the revs come down a bit. As soon as it warms up after 5 minutes or so, the noise goes away entirely for the day. It only happens in the morning on first start up or after about 6 hours of not driving.
Thanks for your help.
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Old 04-13-2015, 11:22 AM   #5
jabela
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Could also be the AC compressor pulley. You could remove the AC belt to see if it goes away.
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Old 04-25-2015, 01:29 PM   #6
/Alessandro\
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Quote:
Originally Posted by mmmdddmmm333 View Post
I've already changed the idler, and tensioner pulley as well as the water pump. I guess that leaves the alternator. Also, my blower fan does make some noise but its a different noise altogether. The whinning does go away at higher revs and then comes back when I shift and and the revs come down a bit. As soon as it warms up after 5 minutes or so, the noise goes away entirely for the day. It only happens in the morning on first start up or after about 6 hours of not driving.
Thanks for your help.
My e36 winter beater had this problem turned out to be the alternator
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Old 04-27-2015, 12:24 PM   #7
mmmdddmmm333
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It seems like that is the next item to check. Going to mechanic on wednesday this week. Thanks for all your input everyone. Much appreciated.
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Old 04-28-2015, 09:43 AM   #8
03Bullet
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Judging by your description it could also be a vacuum leak
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Old 04-28-2015, 08:08 PM   #9
Scape
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If whining goes away with clutch down (assuming its a manual), most likely associated with throwout bearing.
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Old 05-30-2015, 11:18 PM   #10
Schmederling
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Used Alt off a M54

Quote:
Originally Posted by mmmdddmmm333 View Post
I've already changed the idler, and tensioner pulley as well as the water pump. I guess that leaves the alternator. Also, my blower fan does make some noise but its a different noise altogether. The whinning does go away at higher revs and then comes back when I shift and and the revs come down a bit. As soon as it warms up after 5 minutes or so, the noise goes away entirely for the day. It only happens in the morning on first start up or after about 6 hours of not driving.
Thanks for your help.
I have a used Alt - if needed just PM me if needed
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Old 05-30-2015, 11:20 PM   #11
Schmederling
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If there was a Vac leak it would have set of a engine light by now - I had the same issue with cracked intake boots upper & lower. Check that those are in good condition as they will fail with age, common problem with the boots
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Old 06-15-2015, 03:11 PM   #12
CrowsFeast
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Have you checked your power steering fluid? My old car had a leak and would occasionally whine until I got it fixed.
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Old 06-15-2015, 06:40 PM   #13
Dinanstu
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Secondary air pump. It runs on start up; if it's going out it will whine..
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Old 06-16-2015, 11:03 AM   #14
Blackedout95
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As mentioned above numerous things but cannot tell over the net unfortunately.

I have seen many DISA valves (mine included) whine/whistle when the seal starts to leak Usually heard a bit at idle and coasting or slow driving like when turning a corner or starting to slowly acc. Like someone is whistling or a kettle blowing and then nothing! Again all just guesses.
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