Knocking Noise

Sat Apr 16, 2011 9:47 pm

Hi, my 1991 320 cab 155k has developed a knocking noise. It is most obvious when I drive to work in the morning 7:30 am ish. It sounds like its under the passenger seat somewhere. Sometimes when I leave work 18:00 it does it also. Temperature related?! It only last for a short time/distance but varies in loudness and is connected to accelerating.

Suggestion appreciated as I am getting concerned.

Thanks

Sat Apr 16, 2011 9:53 pm

I'd be checking the prop shaft center bearing and donut but the knocking would be constant i would have thought.

Sat Apr 16, 2011 11:09 pm

Also check control arm rear bush? in the right area for it?

Mon Apr 18, 2011 8:09 pm

thanks, I will have a look at the control arm bush but it sounds more front than rear.

If not I will post again, ha

Mon Jun 20, 2011 2:23 pm

The noise is getting louder and more frequent. It sounds more like its near the front wheel, could this be wheel bearing or control arm/bush related or any other ideas?

Mon Jun 20, 2011 2:29 pm

try the donut mate i just had this problem new donut cured it.when the car was on the flat and at at a good speed it was ok but put the engine under load ie in 1st or 2nd pulling up a hill it was bad.i would go the donut mate

Mon Jun 20, 2011 2:55 pm

Thanks, where can you get one from and any idea how to replace?

Mon Jun 20, 2011 7:20 pm

www.c3bmw.co.uk
this is where i bought mine and is good quality £30.26 delivered.as far as fitting goes if you goy access to a ramp it,s quite simple just make sure you get the bolts facing the rite way.three bolts insert towards the gearbox and threee insert towards the rear of the car.do not put them in all one way other wise donut won,t last too long.hope this helps