Hi,
Is your ride bouncing like this:
Or just low speed "bobbing" - like up and down oscillation, tiny but fast ?
My ST on a 08 civic has similar problem to yours. 1) bobbing at low/crawling speed 2) clunking front driver side strut
Coils have done approx. 4000miles but both issues have been since the coils are installed on the car. While the ride is great at high speed, the dampers seem to unable to control the spring at low speeds < 40mph and very noticeable at crawling speeds or coming to a stop. I can't tell if the bobbing bouncing on all struts, but I noticed mostly on the front.
As for the noise, it sounded exactly like this:
Noise will go away after a few miles, and will come again after the car is at rest at least 30mins.
I thought my problem is an isolated case but after I googled it seems these two problems are the traits of ST, KW V1 & Eibach coils.
Dealing warranty with KW is a bit pain and lengthy process as we need to send back the struts, wait (probably weeks) for them to return the item. Since I drive my car daily, I talked to my dealer and they agreed to let me purchase the front right strut and return the knackered one once I got the new one installed, hopefully they'll refund my money.
Strangely, they didn't ask me to replace the strut insert but rather the whole strut. And the bad part is I have to pay the shipping at full cost as if I'm buying the whole set again, this is because KW is sending ONE strut in the big box!
Not to say ST are bad coils, because plenty of owners are happy with them.. general consensus is that they are good coils but there are people commented the coils do bobbing once in a while. But good coils should ride great straight out of the box, no? I've ridden a car fitted with H&R monotubes and while it is firmer, it rides a lot smoother.
I'm not sure if the knocking is associated with the bouncing bobbing, as I can only know when the new strut has been installed.