what sound is that???

[hkh_88]

:dunno: Happened on my E30, some sound like "gook gook" come out from the steering wheel (the black box with the wiper control n signal don't know how to say), happen when i hit some hole on the road, can hear it if i shake the steering left and right when the car not moving :cry: Any sifus can help me??? :dunno: BTW, i juz change steering coupling last month.....