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Old 12-03-2015, 10:23 AM   #1
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Can somone help me identify what this noise is? [VIDEO]

Good morning E46 community.

Recently, my 2002 BMW 325i has been making a weird noise when I turn it on. It only happens when the car is sitting idle, and goes away when you accelerate or put it in neutral. Just recently started happening, and I have no idea what it could be.

Any help from you guys would be great as to identifying this noise because it is loud and annoying. LINK TO VIDEO:
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Old 12-03-2015, 10:47 AM   #2
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Sounds like a diesel!

Did you check fans/ pulleys/ belts etc? Tried to identify from what part of the engine the noise comes?

It only makes the noise when the AC compressor is on or when it's off it makes it too?

The secondary air pump can be a bit noisy but I don't think that noisy!

Just my two cents...
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Old 12-03-2015, 10:50 AM   #3
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It is on basically all the time. Unless when I'm driving... you don't hear it. Only when the car sits idle. It seems like it could be coming from the front of the engine. It almost sounds like a fan is hitting metal or something. Yeah, it's really loud.
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Old 12-03-2015, 03:55 PM   #4
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A mechanical main belt tensioner can cause that noise when the attachment bolts work loose, or the oil filter housing assembly that it mates with gets warped.

The mechanical tensioner has two opposing bolts, and can pivot during idle and cause the metal sounding rattle.

Start with removing the belt after the engine is at full temperature, and starting it up. If the rattle is gone, you've at least isolated the possible causes to a pulley or tensioner.
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engine, noise

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