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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20 and N26 Turbo Engine / Drivetrain / Exhaust Modifications > Weird metallic sound when engine running
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      12-01-2012, 04:13 PM   #1
rolandleth
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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.



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

Thanks!
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      12-01-2012, 04:16 PM   #2
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Normal, mine does it too
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      12-01-2012, 04:44 PM   #3
David328M-Sport
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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.
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      12-01-2012, 05:21 PM   #4
rolandleth
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Quote:
Originally Posted by David328M-Sport View Post
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...
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      12-01-2012, 05:36 PM   #5
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Quote:
Originally Posted by rolandleth View Post
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
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      12-01-2012, 05:54 PM   #6
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Quote:
Originally Posted by rolandleth View Post
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.
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      12-01-2012, 07:04 PM   #7
rolandleth
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Quote:
Originally Posted by 755MSL View Post
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.
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      12-01-2012, 07:13 PM   #8
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that is how direct injection engines sound lol
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      12-02-2012, 02:46 PM   #9
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Quote:
Originally Posted by 755MSL View Post
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.
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      12-04-2012, 12:07 PM   #10
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Quote:
Originally Posted by rolandleth View Post
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.



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....
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      02-11-2013, 04:45 AM   #11
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Quote:
Originally Posted by rolandleth View Post
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.



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
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      02-11-2013, 06:15 AM   #12
David328M-Sport
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Quote:
Originally Posted by Bruno28 View Post
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!
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      02-11-2013, 06:17 AM   #13
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Quote:
Originally Posted by David328M-Sport View Post
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.
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      02-27-2013, 11:12 PM   #14
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your also hearing the wastegate flapper rattle, which is is normal.
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