'02 3.0 Whistling Noise Acceleration Need Advice

gollum · #1 09-29-2005, 11:07 AM

Upon intial normal acceleration and the when maintaining speed, but not during hard acceleration, I get a whistling noise. It sounds like a bird chirping without the chirp, just one long continuous whislte.

I took it to the dealer and they explained to me it was normal, that it had to do with the DISA valve. I have searched for this problem already on these forums, but with no luck on finding any info. I have also googled it, to no avail.

Question: Is this sound normal? I did find one article describing a problem close to this, it also said that all bimmers do it to some degree. However, I have driven in several X's of varying types and have never heard it. I suppose I could be more sensitive to this high piched whistle than others, but all the service coordinators and techs heard it, so I think not.

My dealer is ordering a new DISA valve to see if it helps.

Any opinions\links\advice would be greatly appreciated......

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adrian.b · #2 09-29-2005, 11:23 AM

Only a guess but could be the ribbed V belt that`s worn? I`m sure the dealer would have checked this tho. Mine doesnt whisle or make any noises like that at all so it`s definitely not normal.

Did the dealer hook it up to the machine to see if there were any errors in there?

gollum · #3 09-29-2005, 11:45 AM

Belt is new......I have had the car for 3000 miles.....bought it with 47k now at 50k. Did not make the noise when I bought it. It is certified, so everything is under warranty. The dealer is ordering the part. There are no warning lights or messages popping up.

gollum · #4 09-29-2005, 02:09 PM

Whistle noise link

Found a link to a post on bimmerfest. This is almost exactly what I am experiencing. Thinking the tech maybe on to something with the DISA valve. Directly related to intake, and my noise is more accurately described as "sounds like a supercharger".

CND · #5 09-29-2005, 02:19 PM

I have a 2002 3.0 w/54k and have never heard such a sound.

Knock on wood . . . .

dshue · #6 09-29-2005, 02:44 PM

i have an 01 3.0 and have noticed the same noise. I figured it to just be a wind noise off of the mirrors or sunroof.

gollum · #7 09-29-2005, 03:55 PM

Defintely not wind noise, seems acceleration related. Happens from a stop, slow acceleration and then at "maintain speed acceleration". Hard acceleration it is non-existent. Maybe a bad bearing on a pulley?

gollum · #8 09-29-2005, 03:55 PM

By the way, thanks for all the opinions guys....really appreciated.

MC© · #9 09-29-2005, 11:16 PM

Here's my service history for a "whistling" (mine was more of a growl) sound from the intake plenum on a 2002 3.0:

1st time: Installed foam donut absorbers on two metal lines that run near the firewall (didn't work).
2nd vist: Oil Service (did quiet the engine somewhat but still didnt work)
3rd: The BMW senior engineer suggested, replace belt and belt tensioner (helped somewhat but still an ocassion whistle)
4th visit: Tighten the pleunum and cleaned intake (again failed)
5 visit: Insisted they change the idle adjustor module as suggested here. Sound appears to be gone or I just gotten used to it.

Start with the idle adjustor; demand that the dealer replace that part. If that fails, try the belt & tensioner.

gollum · #10 09-30-2005, 07:40 AM

The day after I took delivery of the car the belt and the tensioner were replaced. The day I took delivery I really put the car through its paces. After I arrived home, parked and was at idle I heard a different belt/fan noise. So took back the next day. The replaced the front fan, rear fan, belt and tensioner all at once. Noise disappeared.

Until 1 week ago, everything was fine, then this noise.

Am I right in assuming the idle adjuster is the same as the DISA valve?

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