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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 10-20-2008, 11:45 PM   #1 (permalink)
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Whining Noise when Accelerate?

Hi Guys,

My engine make whining noise when accelerate. The whining noise is not there when the car idle. Does anyone know what might be the problem? Is it the air intake? idler pulley?

Will appreciate any help

Thanks.
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Old 10-21-2008, 01:18 AM   #2 (permalink)
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Could be you need anew air filter or the intake has a rip or hole in it (check this first). Also, your belts could need replacing. The best way to diagnose this is to have someone rev up th e engine while you listen in on the engine bay.
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Old 10-23-2008, 01:55 PM   #3 (permalink)
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Originally Posted by drz View Post
Could be you need anew air filter or the intake has a rip or hole in it (check this first). Also, your belts could need replacing. The best way to diagnose this is to have someone rev up th e engine while you listen in on the engine bay.
what this person said, when engine is cold take a look at your intake boots get in there with your hands and feel, the small part on the lower intake boot is most likely cracked.

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