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Poker2009
Imola


Joined: 09 Sep 2009
Posts: 873
Location: London


PostPosted: Fri Nov 30, 2018 5:20 pm    Post subject: Front driver's side wheel knocking sound Reply with quote

As title, have a knocking sound which seems to be coming from this corner, when I go over any bump in the road. Any ideas what it can be?

Handling doesn't seem to be affected, nor any unusual tyre wear (alignment was last done at Center Gravity in April 17).
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997.1 C2S, Black, Feb 2005: tiny IMS bearing, 60k miles, original engine.
 
  
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TonyC911
Monza


Joined: 06 Jun 2016
Posts: 246
Location: High Wycombe, Bucks


PostPosted: Fri Nov 30, 2018 5:31 pm    Post subject: Reply with quote

Most likely a suspension arm ball joint (or possibly a bush) has failed, this is a common fault on my 3 Series BMW, which produces exactly your symptoms.
Should be a relatively cheap fix... but then it is a Porsche! Rolling Eyes
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Magic919
Österreich


Joined: 05 Jun 2013
Posts: 903
Location: Berkshire


PostPosted: Fri Nov 30, 2018 5:56 pm    Post subject: Reply with quote

Tie rods or control arms. Get some chassis ears on there.
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5520
Location: Brighton


PostPosted: Fri Nov 30, 2018 6:33 pm    Post subject: Reply with quote

If you have never had your diagonal arms replaced and you are round about 50k miles then its probably these arms that are knocking .. usual to get both sides go around the same sort of time .

The noise is on holes in the road or cats eyes .. a rough road basically and its a Bonk .. bonk bonk ... very similar to a link rod noise but a bit deeper in note .

With Diag arms its an annoyance .. it wont cause any problems and some people never bother with it year in year out and they do get pretty loud !
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Ratattak
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Joined: 17 Sep 2017
Posts: 85
Location: About 53°29'12"N 0°59'53"W


PostPosted: Fri Nov 30, 2018 6:56 pm    Post subject: Reply with quote

Common fault on 350 Zeds as well ... compression arm ball joint ... known as the B A N A N A B A R ...
 
  
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Alfaian
Imola


Joined: 12 Mar 2014
Posts: 812
Location: S.wales


PostPosted: Fri Nov 30, 2018 6:58 pm    Post subject: Reply with quote

Mine was the top mount on the shock strut.

Good luck as it's a pain in the neck to get to the bottom of Thumb
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Poker2009
Imola


Joined: 09 Sep 2009
Posts: 873
Location: London


PostPosted: Fri Nov 30, 2018 7:57 pm    Post subject: Reply with quote

deMort wrote:
If you have never had your diagonal arms replaced and you are round about 50k miles then its probably these arms that are knocking .. usual to get both sides go around the same sort of time .

The noise is on holes in the road or cats eyes .. a rough road basically and its a Bonk .. bonk bonk ... very similar to a link rod noise but a bit deeper in note .

With Diag arms its an annoyance .. it wont cause any problems and some people never bother with it year in year out and they do get pretty loud !


I think you have described the symptoms I am having. If this is the case, I will just live with the noise. At the moment, I would rather spend my money on other stuff, than the car! I am on 61k, and have never had anything changed on the suspension.
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5520
Location: Brighton


PostPosted: Fri Nov 30, 2018 8:05 pm    Post subject: Reply with quote

Aghh ok ..

The basic checks are jack the car and feel for play on the wheels .. so top and botom and side to side .. if nothing loose there then the noise is an annoyance .. always check wheel bolts though .. loose and it will be a problem Wink

At that milage you are pretty much into front and rear diag arms .. to confirm they are original for anyone reading then have a look at them .. original will have waxoil on them from new .. replaced and they wont have .
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DucatiRob
Barcelona


Joined: 22 Jul 2015
Posts: 1403
Location: Milton Keynes

2006 Porsche 997 Carrera 2S

PostPosted: Fri Nov 30, 2018 8:36 pm    Post subject: Reply with quote

I have very similar symptoms, the knocking is most noticeable at slow speed over bumpy roads, not so much as speed increases. My car is at 78k and no previous history of any suspension component replacement! I am planning a suspension refresh including Ohlins coil overs, bushes and control arms followed by a CG set up and alignment! Good excuse to have the car set up and handling just how I want it Thumb
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davidjf7
Imola


Joined: 21 Oct 2010
Posts: 763
Location: Hertfordshire


PostPosted: Mon Dec 03, 2018 10:41 am    Post subject: Reply with quote

deMort wrote:
If you have never had your diagonal arms replaced and you are round about 50k miles then its probably these arms that are knocking .. usual to get both sides go around the same sort of time .

The noise is on holes in the road or cats eyes .. a rough road basically and its a Bonk .. bonk bonk ... very similar to a link rod noise but a bit deeper in note .

With Diag arms its an annoyance .. it wont cause any problems and some people never bother with it year in year out and they do get pretty loud !


Mine has the same - is it like snooker balls knocking together?

If so, likely the diagonal arms as deMort says - Centre Gravity diagnosed mine on Friday (especially noticeable over cobbles) so getting them replaced as they're doing a load of other stuff.

Their advice was if you can put up with the noise then just leave them.
 
  
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branko
Newbie


Joined: 13 Mar 2011
Posts: 28



PostPosted: Mon Dec 03, 2018 10:45 am    Post subject: Reply with quote

Had this on the NSF a month ago and went into my local garage and guess what?! Some of the plastic wheel liner had dropped for whatever reason and the tyre was chewing the plastic especially when the wheel was on turn! Clipped it back and didn't want paying so I put a tenner in the charity tin!
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5520
Location: Brighton


PostPosted: Mon Dec 03, 2018 8:27 pm    Post subject: Reply with quote

Snooker balls would be a bit of a tinny type noise .. this is a bit of a deeper noise .. very similar to a link rod .. or if the noise is very loud then its antiroll bar bushes .

Im afraid several components make the same type of noise .

I will say though that if anyone wants to post or email me a sound clip i will have a good chance of saying what it sounds like to me .. bearing in mind ive repaired one or two noise problems in my time Very Happy

De.Mort@virginmedia.com
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