Knocking From Rear

axamax · Post by **axamax** » 13 Nov 2002, 07:14

BX14RE 1989. A friend has borrowed my car for a couple of days and has told me she is getting a knocking noise from the rear of the car all the time. Being told this over the phone, I know as much as you.I guessed that it might be something to do with a ride height adjuster not recognising that it has reached the appropriate height. Therefore I have suggested raising the car to wheelchange height and back down again to clear whatever is sticking. Does this sound a viable diagnosis and (temporary) cure. What else might need doing? Where should I be looking?
philip.coffey@ntlworld.com
Edited by - axamax on 13 Nov 2002 03:09:10

alan s · Post by **alan s** » 13 Nov 2002, 11:37

I'd be inclined to suggest that she sets the suspension on a high setting, stand back from the rear of the car & look at the rear wheels.
If they look I I that's OK but if they are / I or / \ then it's the rear swing arm bearings that will need replacing.
A description of the fault & repair is here:
http://www.bx.citroen.org/m07/m07e.html
Failing that, it could be an exhaust pipe knocking on the bodywork or a rear sway bar also.
Alan S

NiSk · Post by **NiSk** » 13 Nov 2002, 12:46

If you're not 100 on the condition of your rear exhaust damper/piping I'd go for that first. The wifes BX has a habit of doing just that just before the rear box falls off . . .
//NiSk

mbunting · Post by **mbunting** » 13 Nov 2002, 15:27

My Xantia used to make knockings...
1) Going over speed bumps from the back - rear arm bearings - replaced - doesn't happen now.
2) The rear exhaust mounting bolts through to the back panel behind the bumper - the bolt holes are rusting a little, and the bolts are a little loose - although nowhere near dangerous. This was fixed when the middle section was replaced recently.
Mat.

Martin Shorthose · Post by **Martin Shorthose** » 13 Nov 2002, 18:16

Do you know what your friend wanted to borrow the car for?
Could it be that the bound and gagged corpse she has in the back has woken up and wants to get out?!<img src=icon_smile_dead.gif border=0 align=middle>

Martin Shorthose · Post by **Martin Shorthose** » 13 Nov 2002, 18:20

That wasn't particularly helpful was it!
But hey! I'm just collecting those little gold stars for posting lots of messages!
A new member has to start somewhere!
<img src=icon_smile_wink.gif border=0 align=middle>

Zig · Post by **Zig** » 13 Nov 2002, 18:56

I have also experienced a knocking (iregular pattern?)from the rear of my ZX, but generally not when going over bumps but more noticeable when turning a corner? Any similarities??

axamax · Post by **axamax** » 14 Nov 2002, 06:26

Apparently the problem has cured itself. Don't you just love faults like that. Thanks for all the tips though, hopefully it will have the guts to do it when I'm driving next time. (I've told her to make sure the corpses are dead in future or Macdonalds won't pay as much for them.) Thanks again lads.
philip.coffey@ntlworld.com

NiSk · Post by **NiSk** » 14 Nov 2002, 12:35

Ah ha!
The rear box has fallen off then! end of problem. . .
//NiSk