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Rattling/bobbling noise from rear

Z

zcacogp

New member
Chaps,

'Tis the season for funny noises, or so it seems. I have my own to throw into the ring, but I don't think it is a CV joint. However, diagnosing these things via t'interweb is always an inprecise science, so I won't be upset if we don't get anywhere!

My '89 S2 makes a knocking noise. Not a loud one, but an annoying one. It seems to be related to road surface quality - i.e. it knocks when it goes over a bump. The knock is best described as a 'bobbling' noise - it's not a sharp metallic 'tap', more of a slightly muffled rattle. It sounded very like the boot lid rattling up and down - to the extent that I was convinced this was it, so I adjusted the pins at the weekend so it is held more tightly closed and also put some silicone lubricant on the rubber seals. However this didn't cure it.

Therefore, any suggestions? I think it is coming from the near side, but Mrs zcacogp is not convinced. It doesn't happen on smooth roads, it occurs when you go over a bump. It is not affected by speed. I can't see anything rattling in the boot (it sounds like it could be a boot contents rattle) - everything in the storage compartments is wedged in carefully and won't move. I thought it could be the ultrasonic sensor unit, but moving this didn't make any difference either.

Any suggestions?

Thanks in advance.


Oli.
 
Did you check the battery is secure, I`ve put padding under mine which solved a lot of "rattling".
 
ORIGINAL: scz

Did you check the battery is secure, I`ve put padding under mine which solved a lot of "rattling".
Click to expand...
Interesting idea. Thanks for the suggestion. I don't think it is, 'cos the problem has been around for a while, and I actually removed the battery a couple of weeks ago to charge it, but it's certainly worth checking - thanks.

Any other suggestions?


Oli.
 
ORIGINAL: Fen

ARB bush?
Click to expand...
Hmmm. It was only a matter of time before someone came up with something big and heavy and difficult as a suggestion.

How can I spot a dead one, and how hard are they to change? (Frame of reference - one small guy, car parked on road, decent toolkit but no air tools and certainly no lift, it's raining and cold, wife available to supply tea when necessary.)


Oli.
 
I'd say quite easy, never of course having done it lying in the street in the rain. Not sure how to check if it is them, but visually would be a place to start.
 
ORIGINAL: Fen

I'd say quite easy, never of course having done it lying in the street in the rain. Not sure how to check if it is them, but visually would be a place to start.
Click to expand...
Fen,

As usual, a mine of useful information. Thank you.

So, suggestions are ARB bush or battery, any advance on this?

Thanks again.


Oli.
 
OK I'll see your ARB bush and battery and raise you one exhaust.

Mine sometimes rattles against the rear ARB on really bad surfaces. The giveaway was a 'rubbed' section of the ARB right above the rear pipe. The two rear bolts for the exhaust have a certain amount of adjustment. I loosened mine and it lowered the exhaust by a centimetre - it was enough to do the trick then I tightened them up again of course [:)]
 
ORIGINAL: Diver944

OK I'll see your ARB bush and battery and raise you one exhaust.

Mine sometimes rattles against the rear ARB on really bad surfaces. The giveaway was a 'rubbed' section of the ARB right above the rear pipe. The two rear bolts for the exhaust have a certain amount of adjustment. I loosened mine and it lowered the exhaust by a centimetre - it was enough to do the trick then I tightened them up again of course [:)]
Click to expand...
Paul,

Fantastic. Thanks. Lots to be getting on and having a look at. To be honest, I haven't actually got underneath the car to have a look at the situation there, just poked around in the boot. (Cold/wet and no garage are a disincentive to tracing peculiar noises.)


Am I right in thinking that you are a bodywork expert? ('Chipsaway'-type-thing)? If so, I regret not asking you a couple of questions when we met last week. Mind you, you're probably quite glad that I didn't get any further than the rust ...

Thanks again. More suggestions, anyone?


Oli.
 
ORIGINAL: 944turboS

Tool Roll, Spare Wheel, Jack or Compressor ?
Click to expand...
... are all wedged in pretty firmly. May yet be worth taking them out and re-packing tho'. (Beats that wet road/rain/lying down combo.)


Thanks,


Oli.
 
I traced an annoying rear knocking noise on mine to a missing jubilee clip from the fuel filter causing it to constantly knock against it's support.
 
Could something have fallen into the compartments behind the rear wheels? My money would have been on spare wheel moving about as I had a similar noise issue....

You could just turn up the music? [;)]

Phil
 
Chaps,

Jub clip on the fuel filter? I'll add that to the list. Thanks.

Spare wheel moving? I'll lump that with 'other bits in the rear dockets'. (Turning up the music is a good idea).

So, I have:

Rear ARB bushes
Things in the rear dockets (turn up the music)
Fuel filter jub clip
Exhaust on ARB

I'm hoping to get under there tomorrow sometime - directed hunting is very helpful, thanks.


Oli.
 
ORIGINAL: ianreeves

Mine made a knocking noise like this from the rear hatch, some pin adjustment sorted it [&:]
Click to expand...
One that I have already discounted, but the sound seemed to be strongly suggesting that this was the problem ...


Oli.
 
I had a similar thing at Le Mans this year, turned out that all the wheel nuts were loose on one of the rear wheels.
Just a thought.
 
Seat back - I think this is OK, thanks. It's one of the first things I checked.

Wheel bolts? [:eek:] Will check immediately - thanks!


Oli.
 
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