Whistling noise - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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#1 (permalink) Old 07-25-2011, 11:57 PM
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Whistling noise

Can anyone help with this,I have this whistle noise that sounds like a air leak,You can only hear it from inside the car and when accelerate with the windows up.I have had the PCV valve off and noticed the small ribber ring is floppy inside could this be making the noise I don't wont to buy a new one if this is not the problem.The whistle noise has does nothing to the performance it is just annoying and would like to know what it is. Only series answers please.The car is a E36 318is 1996
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#2 (permalink) Old 08-29-2011, 04:57 PM
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Is this a recent development or has the sound been there always? Does it come from the speakers or somewhere in the engine? If former, it might be grounded electricity from the generator affecting the speakers. If latter, it might be the transmission and nothing to worry about, as E36s are known for their loud and obnoxious yet unbreakable transmissions.

I'm no expert, so you might check from someone who is more familiar with cars than I am, but these are some possible causes you might want to check for.
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#3 (permalink) Old 08-29-2011, 10:27 PM
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Hi,The noise is new ,It idles good does not stall at lights it seems to be coming from engine bay it sounds like a air leak and only hear it with windows up and accelerating,it only started when I had a new stop light switch put in .someone told me it could be the alternator so will take of the belt in weekend and see what happens.
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#4 (permalink) Old 08-30-2011, 07:32 AM
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Yeah, the alternator is also a possibility. Does the noise sound when stationary and giving some gas with the clutch up and the gear on neutral (or if you have automatic, gear on neutral) or only when actually accelerating?
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#5 (permalink) Old 08-30-2011, 08:17 AM
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Does the pitch of the whistle vary with the revs? If you at a speed that the whistle is occuring at, and move into neutral and just coast (only when safe to do so) does the noise stay even after the revs have dropped to an idle (but the car is still moving at speed)?


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#6 (permalink) Old 08-30-2011, 10:45 PM
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Hi again,Have just had a good listen with bonnet up and I can hear the whistle sound faintly when I reeve up the sound does go up and down but is louder when in car and I accelerate when taking of so i am thinking it could be the alternator .
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#7 (permalink) Old 08-31-2011, 04:30 PM
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Heater/blower/air-con pump ??


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#8 (permalink) Old 09-07-2011, 12:42 AM
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none of those still looking
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#9 (permalink) Old 09-07-2011, 02:42 AM
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Transmission?
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#10 (permalink) Old 09-07-2011, 08:51 AM
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supercharger?
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#11 (permalink) Old 09-07-2011, 08:56 AM
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Quote:
Originally Posted by 1BADBMR View Post
supercharger?
Wouldn't he know if his car had a turbo- or supercharger?
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#12 (permalink) Old 09-07-2011, 02:53 PM
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You must have a Referee locked in the trunk

I'm no help, am I


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#13 (permalink) Old 09-09-2011, 05:46 AM
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none of these have turbo under hood and supercharger in the boot had them both tested
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#14 (permalink) Old 09-09-2011, 05:50 AM
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No not a referee in the trunk either checked that too besides he wouldn't fit with supercharger in there
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#15 (permalink) Old 09-09-2011, 07:04 AM
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Then you pretty much got to go to a mechanic as I'm out of ideas. Hopefully you and Dabsy can figure it out.
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