Weird noise from engine

beerglass007 · 05-17-2019, 12:52 PM

I have a 2015 330D with 45K miles

I had the radio off and heater off today and noticed that when I accelerated fairly hard and then let off there was a weird noise

When home I lifted the bonnet and it does it when revving the engine hard. It still sounds totally normal but a weird after noise from what I think is the back of the engine, the injector rail is it ???

Its not the turbo, you can hear that spin up and down, its like some sort of air buzzing noise, again doesn't sound like any turbo pipe popped off

It might well be normal and nothing to worry about, but never really heard it before or noticed it

Any ideas ??

Thanks

f30diva · 05-17-2019, 12:56 PM

I literally experienced the same exact thing yesterday (letting off after strong acceleration), so interested to know what others think

(I have a 2015 328i)

Watsey · 05-17-2019, 01:13 PM

Can you make an audio recording of it ?

Russbmw · 05-17-2019, 01:33 PM

May be way off the mark, but my 640 had a rattling/ buzzing noise from the engine bay when the ignition was first turned on, and also when turned off.

It was the valvetronic motor clattering at the limit of its travel.

Gievn when you say it happens, it may be something associated with that.

beerglass007 · 05-20-2019, 10:01 AM

Quote:

Originally Posted by Watsey

Can you make an audio recording of it ?

Yeah i'll try tonight

Ti Rich · 05-20-2019, 11:07 AM

Just sounds like to Turbo dump value operating to me, quite normal.

Did you have the windows open too? - you hear it more if you do.

beerglass007 · 05-20-2019, 01:44 PM

https://youtu.be/nPtcGMXjtjE

Here is the video and noise. After I rev it and then the revs drop back down you can hear a weird sound ( the the turbo spinning up and down )

Like a rough sucking noise

Eddamoo · 05-20-2019, 05:04 PM

Yeah mine does that and so do all the other videos on YouTube of the n57 30d. I think it's the waste gate on the twin scroll turbo. Nothing to worry about, you probably only just noticed it as it's warm enough to put the window down

G50 · 05-21-2019, 05:40 AM

Quote:

Originally Posted by Eddamoo

Yeah mine does that and so do all the other videos on YouTube of the n57 30d. I think it's the waste gate on the twin scroll turbo. Nothing to worry about, you probably only just noticed it as it's warm enough to put the window down

Mine was doing this, I could hear it inside the car, both on throttle sucking, and that darth vader style dump that you have recorded. It also felt more laggy while it was doing this. I took the airbox and most of the intake pipe with the MAF in off, it looked like the airfilter hadn't been seated right and was probably leaking air.
I re-seated everything carefully and put it all back together, and the noise and laggyness went. The "diesel clatter" of the engine also seemed to quiet right down. The intake leak must have been throwing something else off, fueling etc.

IMO the intake pipe is a poor design, prone to not seating correctly, and the very end of it vibrates against the chassis creating a din.

NISFAN · 05-21-2019, 01:04 PM

Quote:

Originally Posted by Eddamoo

Yeah mine does that and so do all the other videos on YouTube of the n57 30d. I think it's the waste gate on the twin scroll turbo. Nothing to worry about, you probably only just noticed it as it's warm enough to put the window down

It doesn't have a twin scroll turbo

:

But that sound is just boost pressure whooshing around.

franco.altuna · 05-09-2020, 05:42 PM

Hey guys, maybe you can help me out.

I think Im having this exact issue with my 2013 BMW F30 328i. its making a very noticable rattle/clattering on rev-down.

I've made a full scan and came up with no codes. The rattle only ocurrs on "violent" rev-downs, If I let of the gas gently it doesn't happen. I've also checked the exhaust for rattles but it doesn't seem to be the culprit here.

I've made a couple of clips, maybe someone can figure out what it is?

05-17-2019, 12:52 PM	#1
beerglass007 Lieutenant 229 Rep 560 Posts Drives: G20 M340i Join Date: Jun 2013 Location: UK iTrader: (1)	Weird noise from engine I have a 2015 330D with 45K miles I had the radio off and heater off today and noticed that when I accelerated fairly hard and then let off there was a weird noise When home I lifted the bonnet and it does it when revving the engine hard. It still sounds totally normal but a weird after noise from what I think is the back of the engine, the injector rail is it ??? Its not the turbo, you can hear that spin up and down, its like some sort of air buzzing noise, again doesn't sound like any turbo pipe popped off It might well be normal and nothing to worry about, but never really heard it before or noticed it Any ideas ?? Thanks
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05-17-2019, 12:56 PM	#2
f30diva Enlisted Member 12 Rep 29 Posts Drives: BMW F30 Join Date: Feb 2019 Location: CA iTrader: (0)	I literally experienced the same exact thing yesterday (letting off after strong acceleration), so interested to know what others think (I have a 2015 328i)
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05-17-2019, 01:13 PM	#3
Watsey Major General 6399 Rep 8,489 Posts Drives: F31 330D sDrive M Sport Join Date: Jun 2015 Location: On sabbatical. iTrader: (1)	Can you make an audio recording of it ? __________________ Current : F31 330sD, remapped, Ohlins Road & Track, Millway camber plates, Quaife LSD, Stoptech brakes + Pagid RSL1 pads all round, Weichers front strut brace, Eibach front & rear anti-roll bars, Michelin MP4S.
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05-17-2019, 01:33 PM	#4
Russbmw Colonel 680 Rep 2,444 Posts Drives: 2018 630iGT sport Join Date: Aug 2013 Location: Caloundra, Australia iTrader: (0) Garage List 2014 BMW 640i [0.00] 2014 BMW 530d GT [0.00] 2017 Kawasaki Z1000SX [0.00]	May be way off the mark, but my 640 had a rattling/ buzzing noise from the engine bay when the ignition was first turned on, and also when turned off. It was the valvetronic motor clattering at the limit of its travel. Gievn when you say it happens, it may be something associated with that.
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05-20-2019, 11:07 AM	#6
Ti Rich Major 310 Rep 1,314 Posts Drives: Porsche Macan S D Join Date: Jan 2008 Location: Dudley, West Midlands, UK iTrader: (0)	Just sounds like to Turbo dump value operating to me, quite normal. Did you have the windows open too? - you hear it more if you do.
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05-20-2019, 01:44 PM	#7
beerglass007 Lieutenant 229 Rep 560 Posts Drives: G20 M340i Join Date: Jun 2013 Location: UK iTrader: (1)	https://youtu.be/nPtcGMXjtjE Here is the video and noise. After I rev it and then the revs drop back down you can hear a weird sound ( the the turbo spinning up and down ) Like a rough sucking noise
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05-20-2019, 05:04 PM	#8
Eddamoo Captain 390 Rep 808 Posts Drives: BMW 430dX Join Date: Apr 2018 Location: Sheffield, England iTrader: (0)	Yeah mine does that and so do all the other videos on YouTube of the n57 30d. I think it's the waste gate on the twin scroll turbo. Nothing to worry about, you probably only just noticed it as it's warm enough to put the window down
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05-09-2020, 05:42 PM	#11
franco.altuna New Member 0 Rep 12 Posts Drives: 2013 F30 328i Sport Join Date: May 2020 Location: Buenos Aires iTrader: (0)	Hey guys, maybe you can help me out. I think Im having this exact issue with my 2013 BMW F30 328i. its making a very noticable rattle/clattering on rev-down. I've made a full scan and came up with no codes. The rattle only ocurrs on "violent" rev-downs, If I let of the gas gently it doesn't happen. I've also checked the exhaust for rattles but it doesn't seem to be the culprit here. I've made a couple of clips, maybe someone can figure out what it is?
	Appreciate 0 Quote