What's that sound after you kill the engine and let it sit for like a minute or two?

N54Society · 03-04-2016, 03:48 AM

Sometimes it's loud other times it's not but the best way to describe it is a pump depressurizing. Sometimes I think I can hear air whooshing after the process completes. I also hear something mechanical moving around the turbos. It makes like a buzzing sound and then it stops.

Anyone know what I'm talking about?

MAN15H · 03-04-2016, 06:14 AM

Yeah the 'pump depressurizing' sound you talk about I can hear that too from inside the car after I turn it off but have no idea what that is.. would like to find out though.

Could it be something to do with the retained head thing that allows you to use the 'rest' mode which keeps pumping hot air into the car even after turning the car off..?

mojobmw_e90 · 03-04-2016, 06:34 AM

The water pump stays on after u shut the car off to help cool the turbos so they don't get damaged. Totally normal. Think of it as a turbo timer

135Pats · 03-04-2016, 09:37 AM

Water pump.

N54Society · 03-04-2016, 10:22 PM

Cool, good to know. Thanks. I thought it was related to the waste gates closing or something like that.

03-04-2016, 03:48 AM	#1
N54Society Major Private First Class 459 Rep 1,327 Posts Drives: 2010 E90 335i M Sport Join Date: Mar 2014 Location: US, NA, Earth, Milky Way Galaxy iTrader: (2)	What's that sound after you kill the engine and let it sit for like a minute or two? Sometimes it's loud other times it's not but the best way to describe it is a pump depressurizing. Sometimes I think I can hear air whooshing after the process completes. I also hear something mechanical moving around the turbos. It makes like a buzzing sound and then it stops. Anyone know what I'm talking about? __________________ 2008 E92 335i 6MT: FBO + MMP Silicone Inlets \| Stage 1 LPFP \| 335is clutch + MFactory SMFW \| Custom BuraQ + MHD tune \| 3.5Bar N20 sensor [SOLD] 2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs
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03-04-2016, 06:14 AM	#2
MAN15H Lieutenant 47 Rep 506 Posts Drives: G20 BMW 330e MSport Join Date: Jun 2013 Location: The Shires iTrader: (1)	Yeah the 'pump depressurizing' sound you talk about I can hear that too from inside the car after I turn it off but have no idea what that is.. would like to find out though. Could it be something to do with the retained head thing that allows you to use the 'rest' mode which keeps pumping hot air into the car even after turning the car off..?
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03-04-2016, 06:34 AM	#3
mojobmw_e90 Major 382 Rep 1,497 Posts Drives: 2014 E63S Join Date: Oct 2014 Location: Chicago IL iTrader: (3)	The water pump stays on after u shut the car off to help cool the turbos so they don't get damaged. Totally normal. Think of it as a turbo timer
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03-04-2016, 09:37 AM	#4
135Pats Major General 461 Rep 6,478 Posts Drives: A few BMWs Join Date: May 2012 Location: Maryland iTrader: (3)	Water pump. __________________ E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP F30 N55 XDrive EBII
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03-04-2016, 10:22 PM	#5
N54Society Major Private First Class 459 Rep 1,327 Posts Drives: 2010 E90 335i M Sport Join Date: Mar 2014 Location: US, NA, Earth, Milky Way Galaxy iTrader: (2)	Cool, good to know. Thanks. I thought it was related to the waste gates closing or something like that. __________________ 2008 E92 335i 6MT: FBO + MMP Silicone Inlets \| Stage 1 LPFP \| 335is clutch + MFactory SMFW \| Custom BuraQ + MHD tune \| 3.5Bar N20 sensor [SOLD] 2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs
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