I bought a used 99 Civic Si in May 2002, and noticed a few months after a significant amount of sagging on the rear driver-side. I should mention i bought the car with 29k miles and Eibach sportline springs already installed. No matter what surface my car sat on (parking lot, garage, etc) the back seemed to sack significantly to the drivers side, whereas the fron of the car appeared even. I got new tires at about 40k and it said nothing on the service slip about alignment, so I was worried, but I drove and the aligment felt perfect, even with the sag still there. I thought maybe I had a blown strut / sagging spring, so I bought KYB AGX struts and some Tsudo racing coilovers 500/400 front/rear. When I had my car up on a lift one of the mechanics pointed out one of the endlinks on my rear sway bar was bent/twisted out of place. I assumed that might account for the sag in the left but I still don't know. Both struts in the rear were pretty blown and the springs seemed fine. We installed the the KYB's with the coilovers on them, adjusted as high as I could turn them since I didn't know how far springs would settle. We dropped my car and the fender gap in rear was about 3-4 inches. The sad thing was it still appeared the driver side was sagging lower in the rear. After a day or two I jacked up the passenger side and lowered the perch on my coilover sleeve (tired of driving around feeling like im going to fall out fron of car). i had to have my buddy lift on the spring with a crowbar since there was some tension between spring and perch. After a few turns the spring lost tension and I could freely lower the perch the rest of the way. I lowered the pass. side and jacked up the driver side. This is where it gets messed up. I had my buddy get the crowbar in and lift the spring so I could lower the perch, and it felt like there was a massive amount of tension. I had to have my friend lift with the crowbar as I lowered the perch the entire time i was turning it, almost 2 inches i believe. The spring was compressed between the upper shock mount and the perch on the strut alot harder than the passenger side. So from this information and the pictures provided, what in god's name do I need to fix on my rear suspension (something tells me replacing that sway bar still probably isnt the problem). Oh and my rear tires sit at different positions in the fenderwell, and carry some POSITIVE camber, even though i have it lowered more than stock. Given the fact you took the time to read my novel I assume you are a nice person and will try to help me. Thanks a lot.

PS - I tried lowering the pass. side coilover to compensate for lean and that helped, but now the front tilts to the pass side whereas the rear used to tilt to drivers. grrrr

 

First of all, I would go by a body shop and have them look at the condition of the suspension parts to inspect for possible accident damage. Chances are that the car or suspension components were damaged by impact. (I'm assuming this by what you said about the endlinks)

Second, I would not recommend leaving the springs adjusted the way you have them set. It will negatively affect your handling.

 

I actually never have had any serious hard-hitting accident in this car. I fear it may have before I bought it, but aside from that all I've done is bump a curb (lightly) twice, and spin out all over the freeway do to flat tire. I thought the spinout might have been to blame since it would put a lot of tension on my sway bar. Can anyone see from these pictures what exactly might be the cause? Or maybe perhaps show me what the rear suspension Should look like? It seems like no matter what I do with the height of the coilovers the car is still rather well aligned. it just looks godawful with the rear pass. tire sitting offset in the wheel well, the rear driver tire having positive camber, and the front pass side being lower than front driver side. Before I put the new struts and spring in the back the problem seemed isolated solely to the rear driver side sitting lower than any other corners. What kind of bend in the rear suspension/frame might cause such a problem? Thank you