B58 Rubbing Noise From Engine Bay?

aleph-one · 03-01-2021, 07:36 PM

Hi all,

Sorry for the generic "weird noise" post, but I wanted to throw this issue up here to get some input. Over the past few months my M40i had had a strange rubbing/grinding noise from the engine bay, more audible on the drivers side. It is very noticeable on a cold start and fades as she warms up. Sound is inaudible from the cabin and does not seem to change with throttle, really only present at a cold start standing still. Checked codes and they didn't turn anything up. Car has been driving just fine the whole time, so I don't think its critical, but I just want to make sure I'm not grinding some belt down to nothingness.

I've looked through several "weird noise" forum posts but haven't found anything similar.

Any thoughts?

Many thanks!

https://photos.app.goo.gl/vfkaGZLq3ia1LEtv6

suby01 · 03-01-2021, 07:45 PM

Could be gas. How many miles do you have and it does sound louder than normal it seems. Its a new car get it checked out by the dealer have peace of mind.

aleph-one · 03-01-2021, 07:53 PM

Quote:

Originally Posted by suby01

Could be gas. How many miles do you have and it does sound louder than normal it seems. Its a new car get it checked out by the dealer have peace of mind.

10,600 miles now. Fuel system came to mind but the HPFP is on the passenger side of these engines so I figured that probably wasn't the culprit, but of course I could be wrong.

Was planning on running it by my local shop in case we couldn't figure it out here

suby01 · 03-01-2021, 08:00 PM

Same mileage as mine. Except Im running a lot more hp and different gas. And mine does not sound like that as of yet. Fingers crossed.
Another suggestion is to maybe try running like a fuel injector cleaner, lucas or techron or even to remove water from the gas tank. They definitely will not hurt anything. But if you want to just skip those and have a pro check it out.

aleph-one · 03-01-2021, 08:02 PM

Quote:

Originally Posted by suby01

Same mileage as mine. Except Im running a lot more hp and different gas. And mine does not sound like that as of yet. Fingers crossed.
Another suggestion is to maybe try running like a fuel injector cleaner, lucas or techron or even to remove water from the gas tank. They definitely will not hurt anything. But if you want to just skip those and have a pro check it out.

Good idea, Ill run some injector cleaner through there. I'm also tuned up but still running 91 so I'm really hoping it's not the tunes fault because this car is on a lease and I have to be sneaky about it

suby01 · 03-01-2021, 08:04 PM

Ahhh if youre tuned also. Definitely run it back to stock and drive it for 1-2 full gas tanks before you visit your local BMW nice people. To be safe ishh.

aleph-one · 03-01-2021, 08:22 PM

Quote:

Originally Posted by suby01

Ahhh if youre tuned also. Definitely run it back to stock and drive it for 1-2 full gas tanks before you visit your local BMW nice people. To be safe ishh.

Will do, is detuning and running a couple tanks for maintenance purposes or for not-getting-my-modded-lease-reported purposes?

I'm also running the first stable bm3 stage 2 map they released for this engine to keep my DME write count low. Could it just be because its an old map?

greekcs · 11-21-2021, 10:07 AM

I have the same noise on my '20 M340i. Were you able to sort it out?

GOTOFMS · 03-30-2023, 07:09 PM

Bump! Noise is still present and 2 different dealerships assured me the sound is normal.

AGONXF30 · 03-19-2024, 07:58 AM

I have the same noise. Only present during cold start-up and as the car warms it goes away. I had two BMW master techs listen and they say they do not hear anything abonornal. Noise has been there for quite some time.

It is one of those noises, like that waste gate rattle in my N55 that’s been there for over 150K miles and only present on cold start-ups, that we may have to just listen and observe if it gets worse.

Too many damn moving parts.

03-01-2021, 07:36 PM	#1
aleph-one Professional Pisser-Offer 26 Rep 49 Posts Drives: 2020 M340ix Join Date: Jan 2020 Location: Albuquerque iTrader: (0)	B58 Rubbing Noise From Engine Bay? Hi all, Sorry for the generic "weird noise" post, but I wanted to throw this issue up here to get some input. Over the past few months my M40i had had a strange rubbing/grinding noise from the engine bay, more audible on the drivers side. It is very noticeable on a cold start and fades as she warms up. Sound is inaudible from the cabin and does not seem to change with throttle, really only present at a cold start standing still. Checked codes and they didn't turn anything up. Car has been driving just fine the whole time, so I don't think its critical, but I just want to make sure I'm not grinding some belt down to nothingness. I've looked through several "weird noise" forum posts but haven't found anything similar. Any thoughts? Many thanks! https://photos.app.goo.gl/vfkaGZLq3ia1LEtv6
	Appreciate 0 Tweet Quote

03-01-2021, 07:45 PM	#2
suby01 Cowboy Astronaut Millionaire 2314 Rep 2,885 Posts Drives: 2020 X3 M40i Join Date: Aug 2019 Location: CT, USA iTrader: (0)	Could be gas. How many miles do you have and it does sound louder than normal it seems. Its a new car get it checked out by the dealer have peace of mind. __________________ The Youtubes https://youtu.be/gzinBJjxIUY Insta https://www.instagram.com/gatosandturbos/
	Appreciate 0 Quote

03-01-2021, 08:00 PM	#4
suby01 Cowboy Astronaut Millionaire 2314 Rep 2,885 Posts Drives: 2020 X3 M40i Join Date: Aug 2019 Location: CT, USA iTrader: (0)	Same mileage as mine. Except Im running a lot more hp and different gas. And mine does not sound like that as of yet. Fingers crossed. Another suggestion is to maybe try running like a fuel injector cleaner, lucas or techron or even to remove water from the gas tank. They definitely will not hurt anything. But if you want to just skip those and have a pro check it out. __________________ The Youtubes https://youtu.be/gzinBJjxIUY Insta https://www.instagram.com/gatosandturbos/
	Appreciate 0 Quote

03-01-2021, 08:04 PM	#6
suby01 Cowboy Astronaut Millionaire 2314 Rep 2,885 Posts Drives: 2020 X3 M40i Join Date: Aug 2019 Location: CT, USA iTrader: (0)	Ahhh if youre tuned also. Definitely run it back to stock and drive it for 1-2 full gas tanks before you visit your local BMW nice people. To be safe ishh. __________________ The Youtubes https://youtu.be/gzinBJjxIUY Insta https://www.instagram.com/gatosandturbos/
	Appreciate 0 Quote

11-21-2021, 10:07 AM	#8
greekcs Major 773 Rep 1,113 Posts Drives: 2020 M340i xDrive Join Date: Jan 2010 Location: Long Island, NY iTrader: (0)	I have the same noise on my '20 M340i. Were you able to sort it out? __________________ 2003 11/02 Steel Gray Metallic on Red M3 - SMGII - VF570 - SUPERSPRINT - KW - BBS - CSL ROOF SOLD 2015 09/14 Alpine White on Red 435i xDrive MPPK - Expensive black vinyl with special lettering. SOLD 2020 12/19 Mineral Gray Metallic on Black Vinyl interior M340i xDrive
	Appreciate 0 Quote

03-30-2023, 07:09 PM	#9
GOTOFMS Private First Class 79 Rep 125 Posts Drives: 2020 M340i Join Date: Jul 2022 Location: NY iTrader: (0)	Bump! Noise is still present and 2 different dealerships assured me the sound is normal.
	Appreciate 0 Quote

03-19-2024, 07:58 AM	#10
AGONXF30 Captain 271 Rep 740 Posts Drives: 2012 335i S-Line/Melbourne Red Join Date: Apr 2015 Location: Upstate iTrader: (0)	I have the same noise. Only present during cold start-up and as the car warms it goes away. I had two BMW master techs listen and they say they do not hear anything abonornal. Noise has been there for quite some time. It is one of those noises, like that waste gate rattle in my N55 that’s been there for over 150K miles and only present on cold start-ups, that we may have to just listen and observe if it gets worse. Too many damn moving parts.
	Appreciate 1 Plusforce156.00 Quote