Knocking sound

Cecca1981 · 11-25-2021, 04:40 PM

Hey guys, I would like to have your opinion on a weird noise that my car is making, video attached…
Is a 2012 n55 112000 miles and is making the same noise since I bought it 1500 miles ago, I changed the oil at BMW dealer 1200 miles ago.
The car is running perfect apart the noise.

Thank you

paul223 · 11-25-2021, 08:03 PM

Quote:

Originally Posted by Cecca1981

Hey guys, I would like to have your opinion on a weird noise that my car is making, video attached…
Is a 2012 n55 112000 miles and is making the same noise since I bought it 1500 miles ago, I changed the oil at BMW dealer 1200 miles ago.
The car is running perfect apart the noise.

Thank you

Open engine oil cap while engine is running, make another video while this. Is there exhaust or combustion leaking in crankcase?

Cecca1981 · 11-26-2021, 12:03 PM

Here the video with me opening the oil cap…

Surly73 · 11-26-2021, 02:10 PM

As far as I know the noise when you open the oil cap is "normal" / typical vacuum pump noise, as bad as it sounds. On my N55 when the engine is cold started it has a little squeak in it too until there's a little heat in the engine. When I was worried about it I searched a lot and found it's "normal" noise for the vacuum pump.

Unspec · 11-27-2021, 12:11 AM

Based on the initial two videos:

Rod knock.

here bc bmw is broken · 05-06-2022, 11:40 AM

Ever figure out the noise? I heard it could be torque converter. I have the same exact noise

BimmerHausPerformance · 05-07-2022, 11:18 AM

That was rod knock

11-25-2021, 04:40 PM	#1
Cecca1981 New Member 0 Rep 11 Posts Drives: Bmw e92 335i Msport - e46 M3 Join Date: Aug 2018 Location: Miami iTrader: (0)	Knocking sound Hey guys, I would like to have your opinion on a weird noise that my car is making, video attached… Is a 2012 n55 112000 miles and is making the same noise since I bought it 1500 miles ago, I changed the oil at BMW dealer 1200 miles ago. The car is running perfect apart the noise. Thank you
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11-26-2021, 12:03 PM	#3
Cecca1981 New Member 0 Rep 11 Posts Drives: Bmw e92 335i Msport - e46 M3 Join Date: Aug 2018 Location: Miami iTrader: (0)	Here the video with me opening the oil cap…
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11-26-2021, 02:10 PM	#4
Surly73 Lieutenant Colonel 534 Rep 1,873 Posts Drives: '11 535xi 8AT KWv3 MPE MHD xHP Join Date: May 2012 Location: Oakville, Ontario iTrader: (1)	As far as I know the noise when you open the oil cap is "normal" / typical vacuum pump noise, as bad as it sounds. On my N55 when the engine is cold started it has a little squeak in it too until there's a little heat in the engine. When I was worried about it I searched a lot and found it's "normal" noise for the vacuum pump.
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11-27-2021, 12:11 AM	#5
Unspec Colonel 1295 Rep 2,588 Posts Drives: 2015 BMW 535xi Join Date: Apr 2019 Location: DMV iTrader: (1)	Based on the initial two videos: Rod knock. __________________ 2015 BMW 535xi Bootmod3 Stage 2 \| ER charge pipe \| ER Catted DP \| Remus Exhaust \| Gplus FMIC \| KW V3 \| Turner Monoball thrust arm bushings \| Wallet regrets ISTA VM Setup/Tutorial
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05-06-2022, 11:40 AM	#6
here bc bmw is broken New Member 0 Rep 9 Posts Drives: bmw 535i f10 Join Date: Apr 2022 Location: Los Angeles iTrader: (0)	Ever figure out the noise? I heard it could be torque converter. I have the same exact noise
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05-07-2022, 11:18 AM	#7
BimmerHausPerformance Major 513 Rep 1,442 Posts Drives: 2011 535i 6MT Join Date: Apr 2019 Location: Chattanooga iTrader: (1) Garage List 2011 BMW 535i [0.00]	That was rod knock __________________ 2011 F10 S55 6MT Website Insta @bimmerhausperformance YouTube
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