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whistling . . whining siren sound at cold start

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Old 12-01-2003, 05:15 PM
  #11  
jba
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Default sounds typical...
most modern high compression engines have some sort of forced induction when cold in order to meet emissions standards. (more air + rich fuel mixture == hot catalyst quicker)

-jba
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Old 12-01-2003, 05:21 PM
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Normal, Audis have done this for awhile... my 2001 225 TTQC had the same.
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Old 12-01-2003, 05:27 PM
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Default If you guys remember...I had the same problem
Thought it may have been a screaming bum on the side of the road (only happened twice, same bum twice too) but it went away.
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Old 12-01-2003, 06:31 PM
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Mine did it all the way home from work tonight...5 miles/10 minutes...just in the 2500-3000rpm range
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Old 12-01-2003, 06:33 PM
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hmm first time i have heard of that.....
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Old 12-01-2003, 06:44 PM
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It was in the low 30's and the car had been outside all day.
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Old 12-01-2003, 08:59 PM
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Default See post about 1 week ago...
I've also noticed this (and live in Texas), but hear it is normal.
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Old 12-02-2003, 03:30 AM
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The bum did?
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Old 12-02-2003, 03:32 AM
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Default Now that it is getting colder in the Northeast I hear the whistle every morning.
It goes away after three or four minutes of easy driving until the car warms up.
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Old 12-02-2003, 07:39 AM
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Default I think it's normal for the first 30 seconds or so of operation
It's because of the timing chain I think, it's very noticable on startup and when I pull out of my garage in the morning, it goes away after a block of driving though.
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