E9X Suspension squeaking over bumps

[veer90]

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.

 

[doublespaces]

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]

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]

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]

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]

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.

 

[veer90]

Didn't matter, new or not. Try some lube in the sway bar bushings; easy enough to try.

I have some WD40 specialist silicone laying around. Would that work?

https://www.wd40specialist.com/products/silicone-lubricant/

 

[NoQuarter]

I have some WD40 specialist silicone laying around. Would that work?

https://www.wd40specialist.com/products/silicone-lubricant/

I think it would work long enough to see if this is indeed the issue or not. If it works, then just wait to see how long it lasts then do it again with a more durable product.

 

[Rob09msport]

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]

It was my Rogue Engineering toe arms... don't be an idiot like me and forget to put grease in the grease fittings lmao

 

[Rob09msport]

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]

My PowerFlex bushings for my front control arm came with silicone grease, FYI.