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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Help Diagnosing N55 Sounds



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      01-12-2020, 12:43 PM   #1
darkrom
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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.
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      01-12-2020, 04:46 PM   #2
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Could be the boost solenoid giving up. I have had strange noises from a boost solenoid before and it had a similar tone, although it wasnt a constant drone like that.
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      01-13-2020, 12:48 PM   #3
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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
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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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