So I just got my eibach sways installed on friday, front and rear (soft setting in front middle in rear) and last night when I started the car (cold start after sitting for about 8 hours) I heard some rattle kind of faintly. I tried to isolate where the sound was coming from when I noticed but it only lasted a few seconds. I turned the car off and back on again and the rattle was softer and I think it sounded like it was coming from somewhere near my rear axle.

I had the sways installed at a performance shop and the guy mentioned sometimes aftermarket sways will make some squeeks, despite the lube on the bushings. But also to install the rear sway the exhaust had to be disconnected too, which makes me wonder if the exhaust is rattling.
I'm going to be bringing the car back to have them take a look and double check everything was fully tightened, but I have a feeling that maybe the exhaust is rattling at some point????

Any insight into what could cause rattling during cold starts, just from having the sways installed? I've been trying to listen for any type of sound while driving but its been difficult to tell b/c of typical road noise and exhaust/hfc normal tone inside the car.

I'll try to take a video of the rattle during a cold start a little later on today.


couldn't get the rattle at cold start but got it at red lights while stopped and able to create the rattle when revving to about 2k. at the end you'll notice it stays consistent when idle.

 

Sounds like a loose nut some where... Crawl under the car and check all exhaust hardware.

Not sure why they had to drop the exhaust or part of it. I was able to get my sways in without touching the exhaust pieces at all (stock exhaust).

 

Had the car on the lift for 10 minutes. The guy disconnected just the passenger side of the axle back/mid pipe to get the sway in easier, so we checked that and everything was fine. However, a bolt on the driver side of the axle back was coming loose just as a coincidence with the timing with the sways being installed. Since it was only a couple days after install I doubt the stiffer suspense rattled anything loose - probably just odd timing is all.

easy breezy though 10 minutes in and out. rattle is gone.

 

It was probably just loose away bar endlink bolt

 

My Tech had to do the same when I got my Eibach sways installed, dropping the mid pipe so to make things easier. I don't get the rattle but a very faint sound, can't describe it..only when I cruise at 4th gear in the city, weird, just 4th gear. Doesn't bother me much though.