Knocking noise coming from rear of car

pj94z · 07-18-2017, 08:18 PM

I have a 2017 340i M sport with 1200 miles.

Today, I noticed a constant knocking sound coming from the rear of the car and my passenger also noticed it sitting inside the car.

(Sounds a bad pulley almost)

I took a short video of the noise, I'll upload here if I can figure out how

Any ideas on what this may be ?

eluded · 07-18-2017, 10:32 PM

Try posting the video to YouTube and then post a link here. Glad I could be of help

pj94z · 07-19-2017, 06:28 AM

Quote:

Originally Posted by eluded

Try posting the video to YouTube and then post a link here. Glad I could be of help

Here's a link to the video on YouTube:

https://youtu.be/CxSLJCPR8OM

RoundelM3 · 07-19-2017, 06:41 AM

Try taking the car to your dealership where they'll diagnose and repair it under warranty...

Michael Schott · 07-19-2017, 10:50 AM

Free the guy stuck in your trunk:-).

ooshnoo · 07-19-2017, 11:35 AM

maybe this will help?

metallicpea · 07-19-2017, 12:24 PM

Well, that' a weird place for that sound to come from for a car that isn't moving. Perhaps the sound is traveling down the tunnel...?

Anyway, yes, get it checked out.

BMWtight2me · 07-20-2017, 12:59 AM

Does it sound rotational? I head a tapping sound during acceleration for a while... then my back axel snapped in half.

smrtphusr · 08-08-2017, 04:17 PM

I have this exact same issue any update OP?

KGB_123_99 · 08-30-2017, 10:00 PM

I have this issue on my 330i. I think it is coming from the exhaust hitting something somewhere but not too sure. I can make it louder by stepping on the brake and lightly pushing the gas to load the drivetrain.

Seems to be much louder when the fuel tank is close to empty (maybe just a coincidence).

erawamai · 09-26-2021, 04:06 AM

There is an SIB out for this.

Some threads below talk about this.

https://static.nhtsa.gov/odi/tsbs/20...61557-9999.pdf

https://g20.bimmerpost.com/forums/sh...php?p=27843899

https://f30.bimmerpost.com/forums/sh....php?t=1424308

07-18-2017, 08:18 PM	#1
pj94z Private First Class 31 Rep 145 Posts Drives: 2017 340i M Sport Join Date: Mar 2011 Location: United States iTrader: (0) Garage List 2014 BMW 328i [0.00] 2017 Infinti QX60 [0.00] 2009 BMW 135i [0.00] 2017 BMW 340i [0.00]	Knocking noise coming from rear of car I have a 2017 340i M sport with 1200 miles. Today, I noticed a constant knocking sound coming from the rear of the car and my passenger also noticed it sitting inside the car. (Sounds a bad pulley almost) I took a short video of the noise, I'll upload here if I can figure out how Any ideas on what this may be ?
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07-18-2017, 10:32 PM	#2
eluded 2JZ-GTE 3005 Rep 3,986 Posts Drives: 340 6MT, 50e, others Join Date: Nov 2015 Location: Sofia iTrader: (0)	Try posting the video to YouTube and then post a link here. Glad I could be of help __________________ A man who views the world the same at 50 as he did at 20 has wasted 30 years of his life.
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07-19-2017, 06:41 AM	#4
RoundelM3 Major General 1833 Rep 6,987 Posts Drives: 15 F80 M3, 22 G01 X3 30i Join Date: Apr 2010 Location: Wendell, NC iTrader: (2) Garage List 2022 BMW X3 [9.83] 2015 BMW M3 [6.50]	Try taking the car to your dealership where they'll diagnose and repair it under warranty... __________________ 2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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07-19-2017, 10:50 AM	#5
Michael Schott Colonel 343 Rep 2,118 Posts Drives: 2017 VW GTI Sport Join Date: Dec 2007 Location: Farmington Hills, MI iTrader: (0)	Free the guy stuck in your trunk:-).
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07-19-2017, 11:35 AM	#6
ooshnoo Lieutenant Colonel 873 Rep 1,678 Posts Drives: 2014 428i and 2018 X5 Join Date: Mar 2017 Location: Buford, GA iTrader: (0) Garage List 2018 BMW X5 [0.00] 2014 BMW 428i [10.00]	maybe this will help? Attached Images __________________ ___________________ 2014 F32 428i M-Sport 2018 F15 M-Sport
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07-19-2017, 12:24 PM	#7
metallicpea Major 713 Rep 1,329 Posts Drives: 320i ZSP & E46 M3 6MT Join Date: Feb 2016 Location: Chicagoland iTrader: (1)	Well, that' a weird place for that sound to come from for a car that isn't moving. Perhaps the sound is traveling down the tunnel...? Anyway, yes, get it checked out. __________________ 2002 325i sport - sold 2009 135i M sport - sold 2009 550i M sport - sold 2005 M3 6MT Jet Black w/Cinnamon 2016 F30 320i ZSP 2003 E46 325it ZSP 5MT
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07-20-2017, 12:59 AM	#8
BMWtight2me Second Lieutenant 87 Rep 239 Posts Drives: 320ayayay... Join Date: Aug 2016 Location: Los Hang iTrader: (0)	Does it sound rotational? I head a tapping sound during acceleration for a while... then my back axel snapped in half.
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08-08-2017, 04:17 PM	#9
smrtphusr Private 42 Rep 96 Posts Drives: 2017 340i xDrive Join Date: Jan 2016 Location: Southwestern Ontario iTrader: (0)	I have this exact same issue any update OP?
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08-30-2017, 10:00 PM	#10
KGB_123_99 Captain 404 Rep 962 Posts Drives: '17 330ix M-Sport, '09 528ix Join Date: Apr 2014 Location: Montreal, QC iTrader: (0)	I have this issue on my 330i. I think it is coming from the exhaust hitting something somewhere but not too sure. I can make it louder by stepping on the brake and lightly pushing the gas to load the drivetrain. Seems to be much louder when the fuel tank is close to empty (maybe just a coincidence).
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09-26-2021, 04:06 AM	#11
erawamai First Lieutenant 162 Rep 305 Posts Drives: BMW 330i G21 Join Date: Nov 2005 Location: Sydney, Australia iTrader: (0)	There is an SIB out for this. Some threads below talk about this. https://static.nhtsa.gov/odi/tsbs/20...61557-9999.pdf https://g20.bimmerpost.com/forums/sh...php?p=27843899 https://f30.bimmerpost.com/forums/sh....php?t=1424308
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