Single 'clunk' noise in cabin.

m981addicts · 09-14-2014, 12:36 AM

Quote:

Originally Posted by heeblet

Great thread - I"m going to add that to the list of items on my next service appt. To me sounds like a rock nailing the windshield. Is that a good analogy to anyone else? Loud pop.

The loud pop was the initial noise that caught my attention. Since I started the thread, the sound seemed to have become less intense in loudness. After work, I drive about 3 miles on surface streets before jumping on the interstate. The pop occurs only once about a minute after 'getting on the gas.'

chris82 · 09-14-2014, 12:57 AM

Quote:

Originally Posted by the1andonly

If its more of a "POP" sound from the dash area its common. Its caused but hot temps outside combined with the materials/fitment in dash. You prob didn't hear them in cooler weather.

I get this as well

Downeaster1 · 09-14-2014, 10:05 AM

I'm going to pull apart my dash on monday, and i'll report back if there is any issues with the securing of the airbag.

CAVU · 09-16-2014, 10:55 AM

After experimentation with the A/C controls and further observation, I believe we are dealing with two different noises: 1) the A/C valve slamming closed; and 2) relative movement between structural members. They sound very different, but both come from the dash area (at least in my car). They happen at different times and under different conditions. Anybody else have this observation?

Fone Phreak · 04-28-2015, 05:35 PM

Quote:

Originally Posted by CAVU

After experimentation with the A/C controls and further observation, I believe we are dealing with two different noises: 1) the A/C valve slamming closed; and 2) relative movement between structural members. They sound very different, but both come from the dash area (at least in my car). They happen at different times and under different conditions. Anybody else have this observation?

i agree - at first i thought it was something in HVAC system but now i'm thinking something is loose like strut brace or similiar.
If i drive over a speed bump (very slow) CLUNK - or turn left or right - CLUNK -
absolutely BRUTAL.

Going in next week for service, lets see. Fortunately my S.A. is sharp and gets things done, fingers crossed.

I currently HATE driving my car

CLUNK

edisapimp · 04-28-2015, 09:50 PM

Quote:

Originally Posted by Fone Phreak

i agree - at first i thought it was something in HVAC system but now i'm thinking something is loose like strut brace or similiar.
If i drive over a speed bump (very slow) CLUNK - or turn left or right - CLUNK -
absolutely BRUTAL.

Going in next week for service, lets see. Fortunately my S.A. is sharp and gets things done, fingers crossed.

I currently HATE driving my car

CLUNK

A clunk going over a bump can often be the sign of failing or worn front suspension bushings. Common culprits include control arms, tie rod end links, and swaybar end links. These are easy to fix. How many miles have you got?

Solo_M_Tech · 04-29-2015, 03:02 AM

Quote:

Originally Posted by edisapimp

A clunk going over a bump can often be the sign of failing or worn front suspension bushings. Common culprits include control arms, tie rod end links, and swaybar end links. These are easy to fix. How many miles have you got?

I have the exact same issue. Sometimes does it in reverse and it always comes from the driver side. Any easy way to check? it might be time to upgrade the lower control arms.

edisapimp · 04-29-2015, 04:31 AM

Quote:

Originally Posted by ApexResistance

I have the exact same issue. Sometimes does it in reverse and it always comes from the driver side. Any easy way to check? it might be time to upgrade the lower control arms.

The easiest way to check is to put the car up on jackstands (suspension must be unloaded), remove the wheel on the affected side, and visually inspect all the bushings. You can do a "shakedown," use your hands to move the control arms and end links around, if there is excessive play in any of the connections, that is an indication of worn bushings. There are a ton of youtube videos on how to replace/repair them. Good luck!

scythe1969 · 04-30-2015, 01:40 AM

Subscribing to this, I've been trying to figure out how to describe said clunk noise to pose this exact question. I'm a little relieved to hear that it's not structural... I'm going to check out the A/C theory tomorrow (I do run with the auto circulation setting), the airbag and suspension theories over the weekend. With all the plans for further mods, I don't want any distractions - mentally or financially... :-)

luv135i · 04-30-2015, 06:27 PM

I replied to something like this a while back. I had my cowl off for jb install and there is some type of revolving vent in the firewall in front of the glove box and under that cowl. With the cowl off i noticed at a random time the vent slammed shut leading to the sound we here inside the cabin. It appeara to have something to do with the ac.

Fone Phreak · 06-04-2015, 03:41 PM

im at 59k miles - i will def check control arms etc - it sure sounds like ac inner vent door but i gotta start somewhere.

09-14-2014, 10:05 AM	#25
Downeaster1 BMW Master Tech 587 Rep 850 Posts Drives: E30, E36, E82, E90, F10, F80 Join Date: Jan 2011 Location: SoCal iTrader: (0) Garage List 2015 Aston Martin V ... [0.00] 2010 Lamborghini LP ... [0.00] 1985 Alpina C2 2.7 [0.00] 2017 BMW M3 [0.00] 2008 BMW 128i [10.00] 2013 BMW 135is [0.00] 1992 BMW 325i [0.00]	I'm going to pull apart my dash on monday, and i'll report back if there is any issues with the securing of the airbag. __________________ 135is #502 of 586 BMW LED Performance Wheel \| OEM FULL Carbon Fiber \| E9X M3 Gauge Cluster \| E9X Exterior Mirrors \| E9X M3 Full Suspension \| E9X M3 Diff \| PT-CAN2 Enabled \| Bilstiens \| Michelin PSS's \| NBT Navigation Retrofit with Touch Pad
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09-16-2014, 10:55 AM	#26
CAVU Captain 151 Rep 929 Posts Drives: '16 F87 M2 Join Date: Jun 2013 Location: Ohio iTrader: (0)	After experimentation with the A/C controls and further observation, I believe we are dealing with two different noises: 1) the A/C valve slamming closed; and 2) relative movement between structural members. They sound very different, but both come from the dash area (at least in my car). They happen at different times and under different conditions. Anybody else have this observation? __________________ *F87 '16 M2 ...* Mineral Grey, 6MT, Exec, MPE Gone: E82 '13 135is 475/586 ... Mineral Grey / Oyster, DCT, Premium, Tech, HK, Michelin PSS, BMW Performance Suspension
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04-30-2015, 01:40 AM	#31
scythe1969 Private First Class 21 Rep 105 Posts Drives: 135i Join Date: Dec 2014 Location: SoCal iTrader: (1)	Subscribing to this, I've been trying to figure out how to describe said clunk noise to pose this exact question. I'm a little relieved to hear that it's not structural... I'm going to check out the A/C theory tomorrow (I do run with the auto circulation setting), the airbag and suspension theories over the weekend. With all the plans for further mods, I don't want any distractions - mentally or financially... :-)
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04-30-2015, 06:27 PM	#32
luv135i Major 60 Rep 1,073 Posts Drives: White Join Date: Nov 2009 Location: GA iTrader: (0)	I replied to something like this a while back. I had my cowl off for jb install and there is some type of revolving vent in the firewall in front of the glove box and under that cowl. With the cowl off i noticed at a random time the vent slammed shut leading to the sound we here inside the cabin. It appeara to have something to do with the ac.
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06-04-2015, 03:41 PM	#33
Fone Phreak Private First Class 17 Rep 167 Posts Drives: 2010 135i Join Date: Jan 2009 Location: MIAMI, NYC iTrader: (1)	im at 59k miles - i will def check control arms etc - it sure sounds like ac inner vent door but i gotta start somewhere.
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