F31 330d 10/2012 loud hissing on medium load

drhousedk · 05-23-2018, 03:35 AM

Hi F30post

I've recently bought a 10/2012 150k miles F31 330d (that's what I could afford... Long live the danish car tax). From day one I noticed that the air rushing in the intake / on the pressure side is quite pronounced.

On light load, it's not audible, and on full load, it's not present either - but on medium load, it's quite apparent. To an extent, where it's intrusive in the cabin.

I've shot a couple of videos of this:

I've tried pinpointing exactly where the sound is coming from, but it's really hard with such a high pitch noise. Moving about the different hoses on the intake side makes no difference in sound - pressure hoses I can't really reach. No obvious signs of "oil speepage" except a very small amount (which seems dried out) around there the crankcase ventilation hose meets the intake pipe.

Is it normal for the 330ds to make this much intake noise? I'm aware how a turbo engine sounds with a bit of turbo whistle, but this seems excessive, even compared to my old 260k miles e91 330d (231 hp).

If it's of any concern, the videos are recorded in Comfort mode. Doesn't sound like the sound is exaggerated in sport or sport+.

Ako2k6 · 05-28-2018, 10:43 AM

They all sound like that mate

drhousedk · 05-30-2018, 10:50 AM

Quote:

Originally Posted by Ako2k6

They all sound like that mate

I just find it almost unreasonably loud, to a point where it legitimately sounds like a boost leak. My E91 was virtually silent in comparison

Kenh356 · 05-31-2018, 01:07 PM

Hello drhousedk,

you're not alone, I have the same issue with my car. I noticed it after about 9 months of owning mine. and it got progressively worse and now sounds exactly the same as yours. I have replaced both intercooler pipes and even had my turbo rebuilt trying to get to the bottom of it.

firstly, I think the sound your video showed with your bonnet up and window open is normal - that's just the sound of the turbo. I believe the sound you are hearing inside the car is different, and I believe it is coming from the airbox (if its the same as mine)

I have loosened the jubilee clips around the turbo that connect the plastic inlet pipe from the MAF/air filter to test, and it doesn't get rid of it, but it sounds quieter. the noise is apparent between 1500rpm and 3000rpm. after that its fine. Its most noticeable when its under load, even light throttle but up hills its apparent.

When I changed my air filter last - it made a difference - but only for a short while. I guess as soon as the filter starts to build up dust it starts to make that noise.

My thoughts anyway.

MetzgerMeister · 07-25-2018, 05:03 AM

I've had this issue on my F30 330d. As time went on it got louder and more apparent. Only yesterday I had the charge pipe replaced to no avail.

From chatting to others on here it seems as though this noise shouldn't be there, others say it's a characteristic of the turbo/engine. It could be the wastegate releasing excess pressure but I've had several turbo cars before this and none of them had this noise. It sounds like there's a leak somewhere, a leak that is very hard to pin point.

My next step will be to get the car on a dyno and go through the gears with someone looking into the engine bay to see where exactly the noise is coming from. If it's a thing that it is the wastegate, a remap should quieten it due to holding in more of this excess pressure.

What's worrying is that another user here had this noise but it's now gone and his opinion of what cured it isn't working for me. BMW dealerships tend to throw out the "it's a characteristic of the engine" line but I'm not so sure.

I would love nothing more than to get to the bottom of this as I want to get mine remapped and what use is a remap if there's a boost leak?

Ken - I'm somewhat relieved to see at this point in time that a turbo rebuild hasn't cured it for you as I was thinking about going down this costly route.

EDIT: It's a pity the US don't get this engine as I would nearly guarantee they would have solved it by now

Enabled · 07-25-2018, 09:18 AM

To see if it's a boost leak, use a smoke machine to smoke the intake tract to find it. That is the best diagnostic test.

MetzgerMeister · 07-26-2018, 06:17 AM

Quote:

Originally Posted by Enabled

To see if it's a boost leak, use a smoke machine to smoke the intake tract to find it. That is the best diagnostic test.

I will ask the dealership to do this but given that I live in Ireland, this wouldn't really be something that would be as readily available as in the US.

evdok · 07-26-2018, 06:31 AM

Mine whistles more than a hiss, id say you have a leak or a pipe is loose/split.

MetzgerMeister · 07-26-2018, 07:14 AM

Quote:

Originally Posted by evdok

Mine whistles more than a hiss, id say you have a leak or a pipe is loose/split.

It does sound like a leak but all pipes and connections have been checked and confirmed to be good.

FaRKle! · 07-26-2018, 01:00 PM

You can always get an OBDII bluetooth adapter and phone logging app to see if your boost is meeting/not meeting your targeted boost. If you're not reaching it, then you know there's a leak.

Enabled · 07-26-2018, 02:09 PM

https://ebay.co.uk/itm/112560961426

These make 8+ hour jobs into simple 20 minute jobs. They run off car 12V source, and use plain mineral oil ('baby oil').
These diag tools are gold.

tomfromON · 07-28-2018, 12:38 PM

Quote:

Originally Posted by drhousedk

Hi F30post

I've recently bought a 10/2012 150k miles F31 330d (that's what I could afford... Long live the danish car tax). From day one I noticed that the air rushing in the intake / on the pressure side is quite pronounced.

On light load, it's not audible, and on full load, it's not present either - but on medium load, it's quite apparent. To an extent, where it's intrusive in the cabin.

I've shot a couple of videos of this:

I've tried pinpointing exactly where the sound is coming from, but it's really hard with such a high pitch noise. Moving about the different hoses on the intake side makes no difference in sound - pressure hoses I can't really reach. No obvious signs of "oil speepage" except a very small amount (which seems dried out) around there the crankcase ventilation hose meets the intake pipe.

Is it normal for the 330ds to make this much intake noise? I'm aware how a turbo engine sounds with a bit of turbo whistle, but this seems excessive, even compared to my old 260k miles e91 330d (231 hp).

If it's of any concern, the videos are recorded in Comfort mode. Doesn't sound like the sound is exaggerated in sport or sport+.

I have a hissing noise as well, just not sure it's the same as yours. Mine is when A/C is on, the high pressure line makes a hissing noise and resonates into the cabin..

Eddamoo · 02-15-2019, 02:54 PM

My car also does this, although not as loud - Did anyone get to the bottom of it?

McAdam · 02-23-2019, 05:16 AM

Quote:

Originally Posted by drhousedk

Hi F30post

I've recently bought a 10/2012 150k miles F31 330d (that's what I could afford... Long live the danish car tax). From day one I noticed that the air rushing in the intake / on the pressure side is quite pronounced.

On light load, it's not audible, and on full load, it's not present either - but on medium load, it's quite apparent. To an extent, where it's intrusive in the cabin.

I've shot a couple of videos of this:

I've tried pinpointing exactly where the sound is coming from, but it's really hard with such a high pitch noise. Moving about the different hoses on the intake side makes no difference in sound - pressure hoses I can't really reach. No obvious signs of "oil speepage" except a very small amount (which seems dried out) around there the crankcase ventilation hose meets the intake pipe.

Is it normal for the 330ds to make this much intake noise? I'm aware how a turbo engine sounds with a bit of turbo whistle, but this seems excessive, even compared to my old 260k miles e91 330d (231 hp).

If it's of any concern, the videos are recorded in Comfort mode. Doesn't sound like the sound is exaggerated in sport or sport+.

I've recently bought my 330d and hearing the same noise but a little quieter.
I can't hear it when revving the car only when doing a pull in 2-3-4 gear and only between 2-3.5k rpm.

drhousedk · 06-07-2019, 02:59 PM

Quote:

Originally Posted by Eddamoo

My car also does this, although not as loud - Did anyone get to the bottom of it?

Actually, after I got the BMW Alarm System installed (at no charge due to a huge wave of steering wheel and navigation theft!), the noise wasn't there anymore. At all. Noticed it right away when I pulled away from the dealer.

Asked them but noone wanted to tell me what they did.

The sound has since then returned, after approx 15k miles. It's so odd.

agentorange · 06-13-2019, 02:29 PM

I wonder if that motor in the 5 series makes the same noise. Might be worth asking in the F10 forum.

Chrisrbk · 04-13-2020, 01:27 PM

Hi all, I found this on the web then tracked it down on the app. Before I go into detail, are people still reading this post?

I have an F10 with the EXACT same sound.

Stew_Pid · 04-13-2020, 08:35 PM

Quote:

Originally Posted by Chrisrbk

Hi all, I found this on the web then tracked it down on the app. Before I go into detail, are people still reading this post?

I have an F10 with the EXACT same sound.

I am!

Chrisrbk · 04-14-2020, 12:37 AM

Have you / do you have this issue?

Simon89 · 04-27-2020, 02:04 AM

My F30 makes the same sound, it's more noticeable if you have the window down

Numbacruncha · 05-20-2020, 03:17 AM

Quote:

Originally Posted by Chrisrbk

Hi all, I found this on the web then tracked it down on the app. Before I go into detail, are people still reading this post?

I have an F10 with the EXACT same sound.

Quote:

Originally Posted by Stew_Pid

Quote:

Originally Posted by Chrisrbk

Hi all, I found this on the web then tracked it down on the app. Before I go into detail, are people still reading this post?

I have an F10 with the EXACT same sound.

I am!

Quote:

Originally Posted by Chrisrbk

Hi all, I found this on the web then tracked it down on the app. Before I go into detail, are people still reading this post?

I have an F10 with the EXACT same sound.

My 530d F11 makes this noise too, my previous 530d E60 never did, would be interested if someone could shed some more light on this. It niggles me that it doesn't sound 'right', not your usual 'turbo' related noise. As others have said - it sounds like a boost leak, although doesn't throw any codes or seem to affect performance in any way. I also found it seems to disappear higher up the revs.

Stew_Pid · 09-13-2020, 04:56 PM

my 330d does the same thing, most noticeable in Sport mode and squeezing the throttle rather than flooring it.

05-23-2018, 03:35 AM	#1
drhousedk Private First Class 31 Rep 100 Posts Drives: 10/2012 F31 330d Join Date: May 2015 Location: Danmark iTrader: (0)	F31 330d 10/2012 loud hissing on medium load Hi F30post I've recently bought a 10/2012 150k miles F31 330d (that's what I could afford... Long live the danish car tax). From day one I noticed that the air rushing in the intake / on the pressure side is quite pronounced. On light load, it's not audible, and on full load, it's not present either - but on medium load, it's quite apparent. To an extent, where it's intrusive in the cabin. I've shot a couple of videos of this: I've tried pinpointing exactly where the sound is coming from, but it's really hard with such a high pitch noise. Moving about the different hoses on the intake side makes no difference in sound - pressure hoses I can't really reach. No obvious signs of "oil speepage" except a very small amount (which seems dried out) around there the crankcase ventilation hose meets the intake pipe. Is it normal for the 330ds to make this much intake noise? I'm aware how a turbo engine sounds with a bit of turbo whistle, but this seems excessive, even compared to my old 260k miles e91 330d (231 hp). If it's of any concern, the videos are recorded in Comfort mode. Doesn't sound like the sound is exaggerated in sport or sport+. Last edited by drhousedk; 05-23-2018 at 05:37 AM.. Reason: protrusive = intrusive
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05-28-2018, 10:43 AM	#2
Ako2k6 Enlisted Member 6 Rep 36 Posts Drives: BMW f36 430d Join Date: Dec 2016 Location: Liverpool iTrader: (0)	They all sound like that mate
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05-31-2018, 01:07 PM	#4
Kenh356 Registered 0 Rep 3 Posts Drives: 2015 F30 330d M Sport Join Date: Sep 2017 Location: Dorset UK iTrader: (0)	Hello drhousedk, you're not alone, I have the same issue with my car. I noticed it after about 9 months of owning mine. and it got progressively worse and now sounds exactly the same as yours. I have replaced both intercooler pipes and even had my turbo rebuilt trying to get to the bottom of it. firstly, I think the sound your video showed with your bonnet up and window open is normal - that's just the sound of the turbo. I believe the sound you are hearing inside the car is different, and I believe it is coming from the airbox (if its the same as mine) I have loosened the jubilee clips around the turbo that connect the plastic inlet pipe from the MAF/air filter to test, and it doesn't get rid of it, but it sounds quieter. the noise is apparent between 1500rpm and 3000rpm. after that its fine. Its most noticeable when its under load, even light throttle but up hills its apparent. When I changed my air filter last - it made a difference - but only for a short while. I guess as soon as the filter starts to build up dust it starts to make that noise. My thoughts anyway.
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07-25-2018, 05:03 AM	#5
MetzgerMeister Private First Class 16 Rep 112 Posts Drives: F82 M4 Join Date: Aug 2012 Location: Ireland iTrader: (0)	I've had this issue on my F30 330d. As time went on it got louder and more apparent. Only yesterday I had the charge pipe replaced to no avail. From chatting to others on here it seems as though this noise shouldn't be there, others say it's a characteristic of the turbo/engine. It could be the wastegate releasing excess pressure but I've had several turbo cars before this and none of them had this noise. It sounds like there's a leak somewhere, a leak that is very hard to pin point. My next step will be to get the car on a dyno and go through the gears with someone looking into the engine bay to see where exactly the noise is coming from. If it's a thing that it is the wastegate, a remap should quieten it due to holding in more of this excess pressure. What's worrying is that another user here had this noise but it's now gone and his opinion of what cured it isn't working for me. BMW dealerships tend to throw out the "it's a characteristic of the engine" line but I'm not so sure. I would love nothing more than to get to the bottom of this as I want to get mine remapped and what use is a remap if there's a boost leak? Ken - I'm somewhat relieved to see at this point in time that a turbo rebuild hasn't cured it for you as I was thinking about going down this costly route. EDIT: It's a pity the US don't get this engine as I would nearly guarantee they would have solved it by now Last edited by MetzgerMeister; 07-25-2018 at 05:11 AM..
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07-25-2018, 09:18 AM	#6
Enabled Lieutenant Colonel 1406 Rep 1,799 Posts Drives: 328xd Wagon, M2 Competition Join Date: Jun 2018 Location: Houston iTrader: (0)	To see if it's a boost leak, use a smoke machine to smoke the intake tract to find it. That is the best diagnostic test. __________________ -2014 328d Wagon, 8HP. Self-tuned, 270hp/430ft-lbs. -2019 M2 Competition MT, Alpine White. Self-tuned 560hp -2016 Mini Cooper S, MT. Many plans. Others: -E36 328is. 2000 Z3 Roady. 2003 VW Jetta TDI Manual. Estoril Z3M Coupe.
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07-26-2018, 06:31 AM	#8
evdok Lieutenant Colonel 819 Rep 1,907 Posts Drives: 330D M/SPORT xDRIVE INDIVIDUAL Join Date: May 2015 Location: WORCESTERSHIRE iTrader: (0)	Mine whistles more than a hiss, id say you have a leak or a pipe is loose/split. __________________ Happy Motoring Evdok
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07-26-2018, 01:00 PM	#10
FaRKle! Brigadier General 4012 Rep 3,538 Posts Drives: 328d Wagon, M2 Comp, i4 eD35 Join Date: Sep 2016 Location: Bay Area, CA iTrader: (4) Garage List 2023 BMW i4 eDrive 35 [0.00] 2017 BMW 328dx Wagon [0.00] 2021 BMW M2 Competi ... [0.00]	You can always get an OBDII bluetooth adapter and phone logging app to see if your boost is meeting/not meeting your targeted boost. If you're not reaching it, then you know there's a leak.
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07-26-2018, 02:09 PM	#11
Enabled Lieutenant Colonel 1406 Rep 1,799 Posts Drives: 328xd Wagon, M2 Competition Join Date: Jun 2018 Location: Houston iTrader: (0)	https://ebay.co.uk/itm/112560961426 These make 8+ hour jobs into simple 20 minute jobs. They run off car 12V source, and use plain mineral oil ('baby oil'). These diag tools are gold. __________________ -2014 328d Wagon, 8HP. Self-tuned, 270hp/430ft-lbs. -2019 M2 Competition MT, Alpine White. Self-tuned 560hp -2016 Mini Cooper S, MT. Many plans. Others: -E36 328is. 2000 Z3 Roady. 2003 VW Jetta TDI Manual. Estoril Z3M Coupe.
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02-15-2019, 02:54 PM	#13
Eddamoo Captain 390 Rep 808 Posts Drives: BMW 430dX Join Date: Apr 2018 Location: Sheffield, England iTrader: (0)	My car also does this, although not as loud - Did anyone get to the bottom of it?
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06-13-2019, 02:29 PM	#16
agentorange Major 1508 Rep 1,385 Posts Drives: 328d Join Date: Nov 2018 Location: Desert SW iTrader: (0)	I wonder if that motor in the 5 series makes the same noise. Might be worth asking in the F10 forum.
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04-13-2020, 01:27 PM	#17
Chrisrbk New Member 0 Rep 6 Posts Drives: 2016 F10 530d Join Date: Mar 2020 Location: Knottingley, UK iTrader: (0)	Hi all, I found this on the web then tracked it down on the app. Before I go into detail, are people still reading this post? I have an F10 with the EXACT same sound.
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04-14-2020, 12:37 AM	#19
Chrisrbk New Member 0 Rep 6 Posts Drives: 2016 F10 530d Join Date: Mar 2020 Location: Knottingley, UK iTrader: (0)	Have you / do you have this issue?
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04-27-2020, 02:04 AM	#20
Simon89 First Lieutenant 96 Rep 328 Posts Drives: F30 330D XDrive Join Date: Oct 2018 Location: York iTrader: (0)	My F30 makes the same sound, it's more noticeable if you have the window down __________________ 13' F30 330D XDrive
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09-13-2020, 04:56 PM	#22
Stew_Pid Private First Class 34 Rep 105 Posts Drives: F31 330d Xdrive Join Date: Mar 2020 Location: UK iTrader: (0)	my 330d does the same thing, most noticeable in Sport mode and squeezing the throttle rather than flooring it. __________________ Stupid is as stupid does...
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