Hello, I bought a Ka (HU very fresh) that had been renewed a lot before (crossbars, dome cover rubber etc.). He drives well, but: If I drive a little faster over ground waves e.g. patching up and the car springs out, it pops, as if a pipe against the rams. The sound is violent and difficult to locate, but probably at the front left. Yesterday we had the Ka at the seller (dealer) on the stage and did not find the cause. – Neither the Auspu ff anything else can beat against somewhere. – All screws and nuts of the wheel suspension and dome lid are fixed. Does anyone have any idea what such a bang can cause when springing out and what can be done about it? LG. noku1