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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > What is this sound? Engine pulley?



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      01-16-2015, 12:32 AM   #1
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What is this sound? Engine pulley?

I get this rattle only when the engine is very cold.

The belt pulley and tensioner have been replaced 3 years ago and I wonder if they are still broken.



What do you think?

How can I isolate this sound cause?
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      01-16-2015, 02:09 PM   #2
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Sounds like something is touching your radiator fan.
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      01-16-2015, 02:59 PM   #3
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which isn't running
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      01-16-2015, 03:11 PM   #4
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If your car is on, then it's running.
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      01-16-2015, 07:07 PM   #5
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at 0'F it doesn't run all the time.

I don't remember if the fan was running when I took the video. I will check next time.

It can also be a belt pulley bearing but it's not easy to diagnose.
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      01-16-2015, 09:45 PM   #6
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you may wanna open the hood and actually look and listen.
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      01-16-2015, 09:49 PM   #7
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Sounds like a busted fan blade.
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      01-17-2015, 11:28 AM   #8
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Quote:
Originally Posted by smellthebeans View Post
Sounds like a busted fan blade.
I agree but I don't think it is.

More I listen to it, more I think it can be the alternator pulley..
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      01-17-2015, 05:03 PM   #9
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PS Pump? Check your PS fluid.
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      01-17-2015, 05:21 PM   #10
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Definitely sounds like something hitting your fan
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      01-17-2015, 06:44 PM   #11
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Quote:
Originally Posted by Gr330zhp
Definitely sounds like something hitting your fan
It's not the fan, it doesn't run.
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