Front left suspension knocking when cold (340 with adaptive susp)

White340 · 01-18-2018, 11:01 AM

Hi,

I noticed that on a cold day (~20 degrees), for the first few minutes of driving I hear a knocking sound coming from the front drivers side suspension when going over bumps. It is fine when the car is warmed up. I have the adaptive suspension on my 2016 340 xdrive. Does anyone else have this problem?

Thx

awilki0101 · 01-18-2018, 01:39 PM

I have also noticed this since we have had crazy low temps in Texas this week.

M2Rush · 01-18-2018, 02:10 PM

Quote:

Originally Posted by White340

Hi,

I noticed that on a cold day (~20 degrees), for the first few minutes of driving I hear a knocking sound coming from the front drivers side suspension when going over bumps. It is fine when the car is warmed up. I have the adaptive suspension on my 2016 340 xdrive. Does anyone else have this problem?

Thx

I'm experiencing the same thing... At first I thought it was a piece of ice flapping around.

Has anybody brought it to the dealer? Is there something wrong or completely normal? What's the cause?

awilki0101 · 01-18-2018, 04:11 PM

I as going to wait for weather to warm up a bit here and poke around underneath. I just happen to notice right after installing Dinan springs so I thought that was issue however it was also right when temps dropped below freezing.

Poon Stick · 01-18-2018, 04:49 PM

Same thing here - knocking seems to come from the rear though

My e46 had a similar sound when the bushings were toast. Shouldn't be that as mine's only 1.5 years old with 26k km on it

awilki0101 · 03-21-2018, 08:54 AM

Update to mine. I finally decided to get rid of run flats and went with Michelin 4S. Sounds magically went away. I kept the RFTs and after looking closely 2 of the 4 tires had feathering on outer edge possibly causing the noise.

EvenKeel · 03-21-2018, 02:48 PM

I have a knocking noise from the front left side of the car that is constant. It's been diagnosed as a failed EDC damper. The estimate from the dealer to replace (both front dampers) is eye watering. My Platinum Extended Warranty does not cover dampers.

Am living with it for now. Will eventually purchase the parts online and have an Indy shop handle.

01-18-2018, 11:01 AM	#1
White340 Lieutenant Colonel 1393 Rep 1,986 Posts Drives: 2018 M3 Comp / 2022 X5 45e Join Date: Dec 2015 Location: NYC iTrader: (3)	Front left suspension knocking when cold (340 with adaptive susp) Hi, I noticed that on a cold day (~20 degrees), for the first few minutes of driving I hear a knocking sound coming from the front drivers side suspension when going over bumps. It is fine when the car is warmed up. I have the adaptive suspension on my 2016 340 xdrive. Does anyone else have this problem? Thx
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01-18-2018, 01:39 PM	#2
awilki0101 First Lieutenant 519 Rep 308 Posts Drives: 2016 340i xDrive Join Date: Oct 2017 Location: Woodlands Tx iTrader: (1)	I have also noticed this since we have had crazy low temps in Texas this week.
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01-18-2018, 04:11 PM	#4
awilki0101 First Lieutenant 519 Rep 308 Posts Drives: 2016 340i xDrive Join Date: Oct 2017 Location: Woodlands Tx iTrader: (1)	I as going to wait for weather to warm up a bit here and poke around underneath. I just happen to notice right after installing Dinan springs so I thought that was issue however it was also right when temps dropped below freezing.
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01-18-2018, 04:49 PM	#5
Poon Stick Two many diffs 43 Rep 120 Posts Drives: '16 340xi MPPSK 6MT Join Date: Jun 2016 Location: Ottawa, Canada iTrader: (0)	Same thing here - knocking seems to come from the rear though My e46 had a similar sound when the bushings were toast. Shouldn't be that as mine's only 1.5 years old with 26k km on it
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03-21-2018, 08:54 AM	#6
awilki0101 First Lieutenant 519 Rep 308 Posts Drives: 2016 340i xDrive Join Date: Oct 2017 Location: Woodlands Tx iTrader: (1)	Update to mine. I finally decided to get rid of run flats and went with Michelin 4S. Sounds magically went away. I kept the RFTs and after looking closely 2 of the 4 tires had feathering on outer edge possibly causing the noise.
	Appreciate 0 Quote

03-21-2018, 02:48 PM	#7
EvenKeel Captain 418 Rep 884 Posts Drives: Sedan Join Date: Aug 2012 Location: USA iTrader: (0)	I have a knocking noise from the front left side of the car that is constant. It's been diagnosed as a failed EDC damper. The estimate from the dealer to replace (both front dampers) is eye watering. My Platinum Extended Warranty does not cover dampers. Am living with it for now. Will eventually purchase the parts online and have an Indy shop handle.
	Appreciate 0 Quote