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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > whining noise from engine



View Poll Results: Does your car engine makes whining noises?
Yes 39 63.93%
No 22 36.07%
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      05-09-2006, 12:14 AM   #23
gos
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Quote:
Originally Posted by blitzkrieg
From what you’re posting, the noise is the alternator. An overrunning “clutch” is used on the alternator drive pulley that allows the alternator to spin somewhat independently of engine speed. If the engine is revved up and shut down while at high rpm’s you will hear the alternator to continue to spin even though the engine is off. In other less complicated words...it's normal...
But the bearings in that pulley can go. As well as the bearings in the fan for the radiator.

Them being out of alignment or damaged may cause a high-pitched whine.
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      09-21-2012, 04:13 AM   #24
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Originally Posted by gos View Post
But the bearings in that pulley can go. As well as the bearings in the fan for the radiator.

Them being out of alignment or damaged may cause a high-pitched whine.
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      09-21-2012, 06:34 AM   #25
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      09-21-2012, 07:43 AM   #26
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Quote:
Originally Posted by kanishkl View Post
Just wondering, what is the reasoning behind not revving at P?
Way back in the day, BMW had issues with automatic transmissions not completely disengaging after having had a gear selected. This caused massive problems in some states which used tailpipe sniffer emissions tests (this was before OBD2) that involved a say 2500 RPM no load test, people would show up, leave the car running, then rev the engine to 2500 in P or N for the test and the trans would eat itself.

I've also heard some horrific noises from old Warner Gear DG-series trans (Studebaker, Jaguar, etc.) when revved in park with a slightly misadjusted throttle linkage and/or a worn torque converter clutch...

In short, it's not recommended...
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