E9X Suspension squeaking over bumps

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veer90

Lieutenant
Nov 16, 2016
582
West Nyack, NY
#1
So my rear suspension squeaks over speed bumps, potholes, etc. Yesterday we had a snowstorm in NY and I dug my car out from under 1.5 feet of snow... lo and behold it stopped squeaking. Update: humidity related, has nothing to do with the weight of the snow.

A mechanic friend said the top hats might be worn and causing the noise. Otherwise the car launches, turns, and stops perfectly. What do you guys think?

I replaced all the arms in the rear except for the main lower spring / shock perch (M3 control arms, rogue engineering toe arms, and ECS billet trailing arms). Recently just checked all the bolts and all were tight. KW V3 coilovers with about 20k miles and no signs of leaking shocks.
 
Last edited:

doublespaces

Administrator
Oct 18, 2016
6,674
AZ
#2
Was the snow heavy enough to make it squat? If not, the only thing I can think of is some sort of moisture lubrication?
 

NoQuarter

Lieutenant
Nov 24, 2017
866
Indiana
#3
On the 5 series, in the front, it is always the front sway bar bushings that squeak in the cold.

Not sure if it helps but may get you thinking of something similar
 

veer90

Lieutenant
Nov 16, 2016
582
West Nyack, NY
#4
On the 5 series, in the front, it is always the front sway bar bushings that squeak in the cold.

Not sure if it helps but may get you thinking of something similar
Sway bar bushings f/r are relatively new, less than 20k miles on them
 

veer90

Lieutenant
Nov 16, 2016
582
West Nyack, NY
#5
Update: seems to be humidity related, not related to the weight of the snow. It's been raining on and off here for the past few weeks and it stops making noise for a few days after it rains.

When it dries out it will always start squeaking again. Spring/shock perches, or main carrier bushings?
 

NoQuarter

Lieutenant
Nov 24, 2017
866
Indiana
#6
Update: seems to be humidity related, not related to the weight of the snow. It's been raining on and off here for the past few weeks and it stops making noise for a few days after it rains.

When it dries out it will always start squeaking again. Spring/shock perches, or main carrier bushings?

Didn't matter, new or not. Try some lube in the sway bar bushings; easy enough to try.
 
Oct 28, 2017
816
Monroe CT
#9
Wondering how you fared. Also do you have adjustable end links and you could loosen and retorque all arms in rear as they should be loaded when installed. I never knew this until this platform and assume many others don't as well.
 

veer90

Lieutenant
Nov 16, 2016
582
West Nyack, NY
#10
It was my Rogue Engineering toe arms... don't be an idiot like me and forget to put grease in the grease fittings lmao
 
Oct 28, 2017
816
Monroe CT
#11
Curious what grease you used some say marine grease but Mobil 1 synthetic says won't wash away either and Is suitable for more applications ie wheel bearings
 

Jeffman

Lieutenant
Jan 7, 2017
846
#12
My PowerFlex bushings for my front control arm came with silicone grease, FYI.
 

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