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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 08-19-2009, 03:08 PM   #1 (permalink)
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loud noise from engine

after a while of driving, the engine makes a loud high pitch whining noise. it only does it when i decelerate and when im at a stop. as soon as a accelerate the noise goes away. i put wd-40 on everything that rotates and the noise continues. does anyone have any suggestion?
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Old 08-19-2009, 03:10 PM   #2 (permalink)
OMFG another one!?
 
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You may be on the hunt for a vacuum leak.
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Old 08-19-2009, 03:21 PM   #3 (permalink)
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any suggestions as to where to look?
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Old 08-19-2009, 03:24 PM   #4 (permalink)
OMFG another one!?
 
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It really depends on the individual car. Maybe a look at realoem.com can help
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Old 08-19-2009, 03:36 PM   #5 (permalink)
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Originally Posted by 05lcBMW View Post
after a while of driving, the engine makes a loud high pitch whining noise. it only does it when i decelerate and when im at a stop. as soon as a accelerate the noise goes away. i put wd-40 on everything that rotates and the noise continues. does anyone have any suggestion?
try WD-40 on the belts. still there?

A whine is always the effect of a pulley bearing gone bad. More so if the pitch of the whine changes as u accelerate or decelerate.

Contrast that to a "whistling" noise which is attributed to intake leaks.

What about when you are stationary(not moving) and u rev the engine... still there? You can go further by listening where the nois is greatest. that will help. :-)
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Old 08-20-2009, 02:01 AM   #6 (permalink)
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yeah its a whistling noise. i did a a test where i warn um the car and take the engine oil cap off to see if the engine wants to turn off and it did want to turm off. so more than likely its a vacuum leak.
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Old 08-20-2009, 02:08 AM   #7 (permalink)
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Wink re:vacuum leaks

easy!

get ur self a can of brake cleaner. run engine at idle and start spraying sparingly at every place there you suspect a leak...

when u notice a change in idle as u are spraying... the point when the idle drops is also where the intake leak is ;-)

shope charge as much as $85.- do do dx like that.. I give my tips for FREE ;-)

Cheers
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Old 08-20-2009, 03:03 AM   #8 (permalink)
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thanks for your help.
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