nocking noise from the backend

[talbot]

i have a E30 320ise, my bro had it for 2years and i now have it four about a year it in gud nick and the engine is in gud nick.
but tha last cuple of mouths there a nocking noise from the back end and only when driving and the sound will AKA gooey stuff and go, iv had sum one look at it and he says there nuthink ther but it still there. has eny one had this problem or mite now what it is?


im sorry for the spelling i have a hard time trying 2 spell

[magpie]

could be the exhaust or rear bushes or there's someone in the boot?

[HairyScreech]

exhaust knocking on the spare wheel well?

[dazleeds]

shocker top mount maybe????

[tomislav]

At a guess you either have a problem with your exhaust and its catching on something or your rear subframe bushes have given up.

Get behind the car, grab the exhaust and shake it from side to side. If you get a knock from it or it seems really wobbly then the chances are you have broken rubbers or a broken exhaust mount.

If this doesn't make any noise then get it to a garage or find a friendly mechanic and get them to have a look at the rear subframe bushes, just in front of the rear wheels.

[bmbartlett]

would you get this knocking when changing gear if the rear bushes have gone? how much are the bushes roughly?

[town325i]

would you get this knocking when changing gear if the rear bushes have gone? how much are the bushes roughly?

Genuine ones are £50 from the dealers for the pair and well worth the money imo

[bmbartlett]

what are they like to change, any special tools required?

[m_jermyn]

Just a thought check your wheels are on tight... This has happened to me before was only half a turn loose.

[davpkav]

shocker top mount maybe????

I'm with Dazleeds on this one. Mine was exactly the same and it was worn top mounts.

[HairyScreech]

top mounts is always a safe bet, though there fairly obvious when there gone, and as he said, its been checked over.

the exhaust tends to look fine but clunk when driving.

and i just noticed how bad the spelling is, may i suggest (with no malice intended, i have issues myself) that you take some time to improve it as good literacy will help you the most in life, more than anything else.
also try using the spell check function in some of the new web browsers, wont help with everything but dose tell you when your wrong and gives you the correct spelling, which means you re learn things with out trying, it helps no end.

[davpkav]

As long as all the correct rubbers, clips etc are in place, the exhaust should be fine shouldn't it?

Oh, and sorry to be a pedant but it's 'does' not 'dose'.

[HairyScreech]

lol, good spot, i guess thats my point proven then.

one of my rubbers was fine, one was shot, that was enough to make the thing knock, combined with the monkey that fitted the exhaust before i got the car fitting the clamps a little wrong.

dosent seem to be a lot of clearance between the spare wheel tub and the clamp/bracket bolts.

[davpkav]

Agreed, but by the same token....it doesn't take much wear for the 'top mounts' to knock either. Moreover, the wear is not that easy to spot (just at a quick check I mean). It took Random Dave (my hero) at Fritz Bits to spot it and replace them.

[HairyScreech]

hmm, thats something ill bear in mind then, every failed top mount iv seen so far has been totally shot.