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S4 Knocking/Clanging sound


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#1 rottenbend

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Posted 25 July 2006 - 07:45 AM

I was wondering if anyone had any ideas on the following. There are similar posts on the forum but nothing specific.

My S4 has developed a strange knocking/banging sound emanating from what sounds like the drivers side wheel arch.

It only happens at low speed when crawling through traffic for example. It is random in frequency and doesn't seem to have anything to do with bumps or steering wheel angle. It can be loud enough for pedestrians to turn and stare on occasion /ubbthreads/images/graemlins/ooo.gif. It sounds like a dull metallic clang as if something is loose and is knocking against metal.

The car seems to drive fine but it is certainly disconcerting.

Have had the car up on its jack but can't see anything obvious.

The car is in to the stealers on Thursday to fix a slight coolant leak under warranty. Will mention it to them then but sometimes they seem to need a bit of "guidance".

Any ideas? Many thanks
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#2 P_G

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Posted 25 July 2006 - 07:53 AM

Oh no, not another 'coolant leak'! /ubbthreads/images/graemlins/EEK2.GIF

I hope yours is only replacement hoses and not a radiator like mine, Tizzy's and possibly AndyMM's.

As for your original post query, I haven't experienced this and can only think a damaged or loose suspension linkage could be the issue
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#3 Will22

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Posted 25 July 2006 - 08:09 AM

[ QUOTE ]
Oh no, not another 'coolant leak'! /ubbthreads/images/graemlins/EEK2.GIF


[/ QUOTE ]

I also had the 'coolant leak' they had to replace the radiators on the S4

They also had to pay to get my side drive and both inside and outside my garages cleaned as the car had left spots all over the place. The cost of the cleaning came to just over £4000 To be fair to Audi they payed the money couple of days after they had a guy come out and check what had to be done.

As I had sold the house I forgot to get the work done /ubbthreads/images/graemlins/UHOH7.GIF

#4 rottenbend

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Posted 25 July 2006 - 08:12 AM

Thanks P_G_

These coolant leaks are becoming popular! What's the betting the dealer says they've never seen one on an S4 before.

As for the noise, I too thought suspension but it happens on smooth roads at very low speed as I'm on and off the throttle in traffic which makes me wonder if it's something else like something loose in the engine bay which is moving around. Or perhaps drivetrain related
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#5 Tizzy

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Posted 25 July 2006 - 08:15 AM

My dealer claimed that they'd never seen the S4 coolant leak before either (I probably believe them as they only look after a few S4's) Does look as though this is becomming a common problem though, so I'd suggest that those of you who haven't yet had it happen, keep a close eye on your coolant reservoir. My low coolant warning only came on when the reservoir was almost empty.
As for the knocking noise, could it be a wheel bearing or a driveshaft?
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#6 P_G

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Posted 25 July 2006 - 08:37 AM

That's the funny thing Tizzy, my coolant resevoir warning indicator didn't ever come on. The only way I knew was by checking is visually and the oil warning going off.
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#7 rottenbend

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Posted 25 July 2006 - 08:51 AM

My didn't come on either. Just noticed that the reservoir was way below min. Seems there's no substitute for an old fashioned visual check.
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#8 paul_tdi

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Posted 25 July 2006 - 10:07 AM

Anti roll bar bushes could also be the source of the knocking noise. HTH
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#9 Scotty

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Posted 25 July 2006 - 10:28 AM

Or possible worn brake pads?

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#10 Merlot

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Posted 25 July 2006 - 03:09 PM

I've had the two small rads in the bumpers replaced due to coolant leaks. It is quite common by the sound of it.
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#11 P_G

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Posted 25 July 2006 - 03:13 PM

When I dropped it off and never got told 'we'll give you a call to tell you the repair cost once we have assessed it' I gathered it was a common fault.

Funny that.
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#12 peterc

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Posted 25 July 2006 - 08:26 PM

Interesting...mine's going in for a coolant leak on Thursday. I am about a month out of warranty although Audi Assist still came out to have a look. Apparently the small radiators are on back order with Audi UK so they are obviously getting through them.
My car has been checked at about year one then year two for coolant leaks due to a dropping coolant level although only now is there a visual drip at the front passenger side of the bumper. Should I pursue a warranty claim?

#13 P_G

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Posted 25 July 2006 - 09:44 PM

I just wonder how the radiator has become corroded to the point it is fault. Obviously not galvanised or S/S then and they must take some punishment.
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#14 Will22

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Posted 26 July 2006 - 06:42 AM

Saab Aero's had the same problem with the intercooler pipes but never really happened until it was well past the 70k mark.

It seems to be starting a lot sooner on the S4's

#15 rottenbend

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Posted 27 July 2006 - 05:46 PM

Car is in at the dealers today to fix the coolant leak. The upshot is that ... the auxilary radiators have corroded and need to be replaced (under Audi warranty which runs out on Monday /ubbthreads/images/graemlins/wink.gif. I'd advise anyone who hasn't done so to get theirs checked over - especially if the cars coming up to the end of its warranty.

Also apparently the noise is due to a problem with one of the front suspension arms. I'll know more when I pick it up tomorrow but this also seems to be a common fault.
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#16 Merlot

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Posted 27 July 2006 - 09:22 PM

[ QUOTE ]
Car is in at the dealers today to fix the coolant leak. The upshot is that ... the auxilary radiators have corroded and need to be replaced (under Audi warranty which runs out on Monday /ubbthreads/images/graemlins/wink.gif. I'd advise anyone who hasn't done so to get theirs checked over - especially if the cars coming up to the end of its warranty.


[/ QUOTE ]

I agree with this completely. Same with me - had them both replaced at the end of the warranty...and it seems very common.
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#17 rottenbend

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Posted 29 July 2006 - 04:47 PM

Nightmare! Parts (radiators) are on back order. Won't have my S4 for three weeks at least and the are no Audi's available for the time being so instead they've given me a..... Vectra /ubbthreads/images/graemlins/mad.gif
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#18 P_G

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Posted 29 July 2006 - 08:36 PM

Yes I should have posted yesterday. I had to go back to Audi on Friday as my coolant level had dropped again... however the technician said it was because ther will be air in the system from the replacement auxiliary radiator and once it has equilabrated to top it up.

WE had a chat and he wanyted to replace both auxiliaries but is only allowed to replce the corroded one, so next year I'll probabyl be back to have the other one done.

Anywayu the downside is that the radiators are now on back order for 10 units and until this volume of orders comes through they ain't sending them individually to the UK as it costs too much.

Therefore if anyone else have a B6 S4 and hasn't had their auxiliary radiators checked, do so and if you have the same problem you will all get your rads quicker.

The reason behind the corrosion is that in the B7 model and smaller engined models theres is a duct to take away all the leaves and garbage that gets blown / sucked into the vents where these radiators are fitted. However there was not enough space to do so at the time of design so all that mulch builds up and eventually corrodes your radiator.

Next year there is likely to be a recall for all B6's for this problem and a ducting system fitted to allow the muck to exit as well as rads if necessary.

In the meantime I'm using my pressure washer to clean out the vents as often as I was it.
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#19 Fergy

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Posted 30 July 2006 - 06:55 AM

where are these vents P_G? Pic please

#20 P_G

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Posted 30 July 2006 - 06:11 PM

It's the parts of the front bumper where the fog lights are housed that I meant, that's where your two auxilliary radiators on the S4 are
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