I will try to give as much info as possible here as I know a lot of details may help to diagnose what has gone on.
-My car is an X reg BMW E46 330D with 80000 miles on (FSH)
-It is the first RWD car I have owned, not he first RWD car I have ever driven though
-I do motorway miles and weekend pootling
-Before today I have noticed that the cars "hips wiggle" when going ove undulations in the road and accelerating - a good example is comig down a slip road and merging into the slow lane where lorries have worn grooves
-I am comfortable when cars loose traction - I understand the fundiments of what will make it happen and how to correct it in FWD and RWD cars but I am by no means the stig.
-As an aside - The other night I purposeully went somewhere private ad wet (
) to see how the car behaved when it lost traction and I was surprised to see it UNDERSTEER a lot of the time, until "over-pushed" - ie the back end did not seem to slide out predictably or progressively.
Today on the way to work I got a puncture. The argument I faced was with a van with a trailer in tow doing close to mach 3 down a thin country road or with a kerb at 20mph ish... I chose the kerb and duly set about changing the tyre (without my nice clean work shirt on) in the rain.
The tyres are now mismatched - Fronts are different and the spare was a P-6000 whihc is now passenger side.
I acknowledge these need changing and will be done tomorrow, this has only been included for the sake of completeness really
Now on to this evening...
I overtook a very sedate driver (doing 35 in a 60) and had eons of room so was in no hurry. I put my foot 1/3 of the way down and began wafting up closer to it and prepared to move out (dry road). As soon as I steered right, around the sloth-vehicle and went over a small undulation in the road the "hip wiggle" I believed to be characteristic went wild and the car almost kicked round on me (TC ON).
A minute or so up the road, going in a straight line, the back swang the other way, almost like ti was steering itself with no warning and scared the hell out of me.
My questionsare as follows:
-What may be causing it
-Why did it do it under gentle throttle in the dry but wouldn't slide properly when provoked with harder throttle in the wet
-Has hitting the kerb (full size spare used) done something?
-Could rear trailing arm bushes be shot, rear arb bushes, drop links, front wishbone bushes and wishbones, front arb links and bushes or shocks and spring s be contributing as I wanna replace the lto soon
-Only other thing I can think is shot subframe mounts??
Any advice appreciated as in a car this (potentially fast) I now feel unsafe and unable to predict handling at all!!
PS no accident damage and HPI clear 2 owers - straight car