rod knock, vanos, or normal ?

bkM3 · 08-01-2023, 09:34 AM

hey guys,
i purchased this 2006 m3 vert 6mt with 111k miles a couple of weeks ago, the car drives great but i just noticed this noise. can you guys please help me diagnose this?

no codes, rod bearings not done but i have an appointment next week

https://www.youtube.com/shorts/pvU4xaUe6Dw

https://www.youtube.com/shorts/jZ00RraEBos

https://www.youtube.com/shorts/sRbxWgm0aOc

the noise seems to go away when the rpms are raised, or at lease not as noticeable

https://www.youtube.com/shorts/7-_E1BErJHE

///M3Lover · 08-03-2023, 06:13 AM

I just finished rod bearing last week. Significant noticeable performance and gas mileage improvement from 17.4L/100km to 15.7L/100km. I didn't have a knock sound though.

Was at 235,000km when the service is done. Mechanic said it was the right timing to do the rod bearing. Wasn't close to the engine blowing up just yet, but it was worn. I am a casual driver though. Only went to couple 3-4 autocrosses and one drag day with only 2 pulls.

Doing Vanos, valve adjustment, steering rack leak, next week.
Did my 1st valve adjustment at around 120,000km ish. I am doing it the 2nd time.

08-01-2023, 09:34 AM	#1
bkM3 Captain 44 Rep 646 Posts Drives: 06 M3 Vert 6MT Carbon/Black Join Date: Sep 2007 Location: Brooklyn iTrader: (1)	rod knock, vanos, or normal ? hey guys, i purchased this 2006 m3 vert 6mt with 111k miles a couple of weeks ago, the car drives great but i just noticed this noise. can you guys please help me diagnose this? no codes, rod bearings not done but i have an appointment next week https://www.youtube.com/shorts/pvU4xaUe6Dw https://www.youtube.com/shorts/jZ00RraEBos https://www.youtube.com/shorts/sRbxWgm0aOc the noise seems to go away when the rpms are raised, or at lease not as noticeable https://www.youtube.com/shorts/7-_E1BErJHE Last edited by bkM3; 08-01-2023 at 12:54 PM.. Reason: added video of revving
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08-03-2023, 06:13 AM	#2
///M3Lover Captain 15 Rep 618 Posts Drives: 04WhiteM3 Join Date: Sep 2008 Location: Vancouver, B.C iTrader: (1)	I just finished rod bearing last week. Significant noticeable performance and gas mileage improvement from 17.4L/100km to 15.7L/100km. I didn't have a knock sound though. Was at 235,000km when the service is done. Mechanic said it was the right timing to do the rod bearing. Wasn't close to the engine blowing up just yet, but it was worn. I am a casual driver though. Only went to couple 3-4 autocrosses and one drag day with only 2 pulls. Doing Vanos, valve adjustment, steering rack leak, next week. Did my 1st valve adjustment at around 120,000km ish. I am doing it the 2nd time.
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