How many miles on the suspension? Could be the springs, probably time for a new suspension.

I don't think I understand the problem, can you provide more detail when you say jumps? Like what type of bumps? Speed at which you are going over the bumps?

 

Cars done 57k.. I am thinking bout some coilovers tbh anyway as shocks and springs are pretty much same money. But the skipping across the road feels more like something is lose and has play in it. It's weird to describe.
Have you got stock suspension on your motor still?

 

No, I replaced mine at 80k miles. You will have to better describe the problem and scenarios for most people to be able to help, myself included.

 

Go back under the car, this time using jack stands. Move the wheel in every direction possible and look for play.

 

Oh right sorry. Basically when I'm driving in a straight line and I then change lane , the front goes over smooth but the rear when it comes across feels like the car wobbles side to side as if something is loose and taking up the slack. Iv had the car put on a 2 poster ramp so all the wheels are free from the ground. Iv tried for play in the wheels and all seems ok. I can twist the toe arm with my hand is this normal?
I really appreciate all your help guys :-D

 

I think rTABS and an alignment. I'd had the feeling of the back when sliding and "hopping" going around turns and that fixed my issue.

 

my 04 325xi sport did this too and i took it to two different german mechanics and they had no idea what the issue was... and when you also did like a shimmy move with the steering wheel to like avoid something in a lane, it felt like the back end was slow and reacting to it and kinda felt like 4 wheel steer, yet they never could find anything wrong with the car..... also drove a 03 Lexus es330 that did this exact same thing and only had 90k miles... but its the weirdest feeling its like its jumping to the right...

 

AFSTUD thats my exact problem. I think I'm going to change the bushes on the swing arm where it's bolted to the body as they are looking but worn. Also change the lower camber arms as not sure if I'm ment to be any movement in them.

 

RTABS guaranteed. Mine looked fine, swapped them out & no more scary highway lane changes over expansion bumps.

 

Push down on the trunk while the car is on the ground... If it compresses then rebounds to the same height... No prob. If it keeps bouncing, then your shocks are bad

Sent from my Dell Streak using Bimmer App

 

The rubber boot were it joins to the carrier is twisted. Il get it back on a ramp and check it with a bar. Is there any good BMW parts specialist to get bits from. Iv seen a few bits on eBay.

 

OP, same thing was happening to my wagon and it turned out that the rear shocks were gone.. springs were still good though. but after replacing those parts the car tracked good. i tried jumping up and down on the rear bumper and it seemed that the suspension was good at first. but after closer inspection. the rear shocks were actually the culprit.