Weird metallic sound when engine running - BMW 3-Series Forum (F30 / F32)

rolandleth · 12-01-2012, 04:13 PM

Hello guys,

Well, it might not be weird, but it's my first petrol engine, so it is weird for me. I know what to look out for, but I hope you guys can spot the sound as well in the clip.

http://youtu.be/M8Oo1GfNzCk

Is this normal? Or shall I take it in for a diagnose?

Thanks!

slmdgee · 12-01-2012, 04:16 PM

Normal, mine does it too

David328M-Sport · 12-01-2012, 04:44 PM

Nope, nothing weird about your engine's idling sound. Mine sounds exactly the same as well. Just drive off and enjoy the ride. It's a great one.

rolandleth · 12-01-2012, 05:21 PM

Quote:

Originally Posted by David328M-Sport

Nope, nothing weird about your engine's idling sound. Mine sounds exactly the same as well. Just drive off and enjoy the ride. It's a great one.

Indeed it is

The concern started from the fact that I didn't have a petrol engine before and was unsure of what's good and wrong; then the fact that you can only hear it on one side and on the other not accentuated it. When I rev it, you can't hear the sound anymore tho.

So, the natural thing was ... to panic

)

Well, thanks for the relief, guys.

edit: on a side note, anyone could tell me WHAT is that metallic sound? Cos for sure it isn't the engine, you can hear it over it...

slmdgee · 12-01-2012, 05:36 PM

Quote:

Originally Posted by rolandleth

Indeed it is

The concern started from the fact that I didn't have a petrol engine before and was unsure of what's good and wrong; then the fact that you can only hear it on one side and on the other not accentuated it. When I rev it, you can't hear the sound anymore tho.

So, the natural thing was ... to panic

)

Well, thanks for the relief, guys.

edit: on a side note, anyone could tell me WHAT is that metallic sound? Cos for sure it isn't the engine, you can hear it over it...

Could be your stock catalytic

755MSL · 12-01-2012, 05:54 PM

Quote:

Originally Posted by rolandleth

Indeed it is

The concern started from the fact that I didn't have a petrol engine before and was unsure of what's good and wrong; then the fact that you can only hear it on one side and on the other not accentuated it. When I rev it, you can't hear the sound anymore tho.

So, the natural thing was ... to panic

)

Well, thanks for the relief, guys.

edit: on a side note, anyone could tell me WHAT is that metallic sound? Cos for sure it isn't the engine, you can hear it over it...

It's the forced injection/induction mechanism (only on the 4cl turbo-petrol). I've actually started to love it because it's so unique, you don't really get that from most of the cars you see on the roads because they are usually naturally aspirated.

rolandleth · 12-01-2012, 07:04 PM

Quote:

Originally Posted by 755MSL

It's the forced injection/induction mechanism (only on the 4cl turbo-petrol). I've actually started to love it because it's so unique, you don't really get that from most of the cars you see on the roads because they are usually naturally aspirated.

Well, till now didn't know if to like or hate it

But think I'm gonna start liking it from now on, since now I know it's not a problem, but on the contrary!

Thanks for the info.

bcl0328 · 12-01-2012, 07:13 PM

that is how direct injection engines sound lol

David328M-Sport · 12-02-2012, 02:46 PM

Quote:

Originally Posted by 755MSL

It's the forced injection/induction mechanism (only on the 4cl turbo-petrol).

Yeah, that one. Actually, I remember this topic being discussed in another thread - or two. Glad everything is all good.

kppanic · 12-04-2012, 12:07 PM

Quote:

Originally Posted by rolandleth

Hello guys,

Well, it might not be weird, but it's my first petrol engine, so it is weird for me. I know what to look out for, but I hope you guys can spot the sound as well in the clip.

http://youtu.be/M8Oo1GfNzCk

Is this normal? Or shall I take it in for a diagnose?

Thanks!

That's normal at idle.

But if it makes that sound while under load....

Bruno28 · 02-11-2013, 04:45 AM

Quote:

Originally Posted by rolandleth

Hello guys,

Well, it might not be weird, but it's my first petrol engine, so it is weird for me. I know what to look out for, but I hope you guys can spot the sound as well in the clip.

http://youtu.be/M8Oo1GfNzCk

Is this normal? Or shall I take it in for a diagnose?

Thanks!

Mine is a 125i hatch, same N20 engine.

I just got it today and sounds the same. Im panicking!
Sound is still there until 2000rpm, after it fades out

David328M-Sport · 02-11-2013, 06:15 AM

Quote:

Originally Posted by Bruno28

Mine is a 125i hatch, same N20 engine.

I just got it today and sounds the same. Im panicking!
Sound is still there until 2000rpm, after it fades out

It's the Bosch HDEV5.2 solenoid injectors. They are inherently noisier than piezo injectors. Nothing at all to worry or panic about. In fact, hearing them means all is good!

Bruno28 · 02-11-2013, 06:17 AM

Quote:

Originally Posted by David328M-Sport

It's the Bosch HDEV5.2 solenoid injectors. They are inherently noisier than piezo injectors. Nothing at all to worry or panic about. In fact, hearing them means all is good!

Oh great that calms me down. But sucks that its such a loud sound.

Turboedv6 · 02-27-2013, 11:12 PM

your also hearing the wastegate flapper rattle, which is is normal.

12-01-2012, 04:13 PM	#1
rolandleth Enlisted Member Drives: F30 328i Join Date: Sep 2012 Location: Bucharest Posts: 45 iTrader: (0)	Weird metallic sound when engine running Hello guys, Well, it might not be weird, but it's my first petrol engine, so it is weird for me. I know what to look out for, but I hope you guys can spot the sound as well in the clip. http://youtu.be/M8Oo1GfNzCk Is this normal? Or shall I take it in for a diagnose? Thanks!
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12-01-2012, 04:16 PM	#2
slmdgee Second Lieutenant Drives: 328I 6SPD Join Date: Nov 2011 Location: Long Island Posts: 288 iTrader: (0)	Normal, mine does it too __________________ 2013 328I 6SPD\|Coils\|Wheels\|Downpipe\|335I MUFFLERS,AFE STAGE 2 INTAKE Founder/Owner: United States Of Stance http://www.facebook.com/UnitedStatesOfStance

12-01-2012, 04:44 PM	#3
David328M-Sport Brigadier General Drives: F30 M-Sport 328i Estoril Blue Join Date: Jun 2005 Location: Melbourne Australia Posts: 3,171 iTrader: (0)	Nope, nothing weird about your engine's idling sound. Mine sounds exactly the same as well. Just drive off and enjoy the ride. It's a great one. __________________ 328i M-Sport, Estoril Blue, Carbon XP 35 Tint, front heated seats, black Dakota, Sports Suspension, Anthracite Headliner, HUD, Pro Nav, Sunroof, hk 600w, Bi-Xenon, 19" 403M wheels, Reversing Camera, DAB+, Xenon, BT Ext Connect.

02-27-2013, 11:12 PM	#14
Turboedv6 Private First Class Drives: '13 Apline White Sportline 328 Join Date: Jan 2013 Location: Boston, MA Posts: 162 iTrader: (0)	your also hearing the wastegate flapper rattle, which is is normal. __________________ 2013 Alpine White 328xi Sport Line 2005 Summit White Chevy 2500 CC Duramax (stock F30 killer) 2005 Wicked White Evo 8 11.71 @ 117mph (stock turbo)

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12-01-2012, 07:13 PM	#8
bcl0328 Captain Drives: 2012 328i Join Date: Mar 2012 Location: Abingdon, MD Posts: 952 iTrader: (0)	that is how direct injection engines sound lol