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BMW 3-Series (E90 E92) Forum
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Help Diagnosing N55 Sounds
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01-12-2020, 12:43 PM | #1 |
Colonel
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Rep 2,206
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Help Diagnosing N55 Sounds
It just started today. Stock car no mods besides chargepipe.
Going to take it to the dealer but in the meantime wondering what it could be. |
01-13-2020, 12:48 PM | #3 |
First Lieutenant
139
Rep 227
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Strange noise. Could be a lot of different things. Could be the water pump, mine made a lot of noise when it was on its way out. I'd pull the oil cap while it's running just to rule out excessive vacuum from a failed PCV. Or could just be a pulley failing and making some noise.
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01-14-2020, 07:38 AM | #4 |
Captain
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The clicking noise in the beginning is the belt tensioner. The strange humming noise sounds like it could be the wastegate pressure converter. I'd unplug it and see if it goes away.
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