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Robertb
Dijon


Joined: 01 Sep 2003
Posts: 7552
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Fri Oct 09, 2015 1:04 pm    Post subject: Grrr, suspension noise, help pls Reply with quote

So, spent a load of ££££ on new coffin arms, new top mounts and a new o/s longitudinal 'tuning fork' arm.

I'm still getting a patter/clonk/rattle from the front N/S at lower speeds over rough roads, e.g the 'dragons teeth' traffic calming raised road markings in villages, things that are raised rather than sunken.

It only happens when the car is warm after a bit of a drive.

I'm assuming the n/s 'tuning fork' is fine as I'm sure the bloke would have said when he did the other work.

Might it be the drop link? There isn't anything else left!

Would replacing either of those upset the full geo I've just had done?
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"911- the guilt-free supercar"

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Wav
Silverstone


Joined: 30 Apr 2015
Posts: 134
Location: Herts


PostPosted: Fri Oct 09, 2015 3:18 pm    Post subject: Reply with quote

Inner tie rods can do this once car has been warmed through?

Although I changed these due to a similar noise, but turns out it is actually my front control arms (forked). Geo should not need adjusting with tie rod or the forks, but will if changing coffin arms and/or top mounts.

I would get the n/s control arm fork changed first, makes sense to have done the pair.

Paul
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wasz
Paul Ricard


Joined: 28 Dec 2012
Posts: 3051


1999 Porsche 996 Carrera 2

PostPosted: Fri Oct 09, 2015 3:35 pm    Post subject: Reply with quote

Inner tie rods on the front. TRW parts are still out there and cheap.

As the steering fluid heats up the tolerance changes and you can feel it through the wheel and the floor. On mine they got worse pretty quickly.

May as well replace the track rod ends too.
 
  
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Robertb
Dijon


Joined: 01 Sep 2003
Posts: 7552
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Fri Oct 09, 2015 3:37 pm    Post subject: Reply with quote

Thanks Paul, the coffin arms and top mounts are all new. Will try the n/s tuning fork arm- it makes sense as you say to have done both sides and its an easy job to change.
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Robertb
Dijon


Joined: 01 Sep 2003
Posts: 7552
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Fri Oct 09, 2015 3:39 pm    Post subject: Reply with quote

wasz wrote:
Inner tie rods on the front. TRW parts are still out there and cheap.

As the steering fluid heats up the tolerance changes and you can feel it through the wheel and the floor. On mine they got worse pretty quickly.

May as well replace the track rod ends too.


Thanks- Oddly, you can't feel it through the wheel, or any harshness through the chassis. Its quite a gentle noise, but just enough to be irritating!

I can see I will end up replacing everything, and it will be the last bit.
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paul987
Kyalami


Joined: 27 Feb 2015
Posts: 1907
Location: east mids


PostPosted: Fri Oct 09, 2015 5:05 pm    Post subject: Reply with quote

Mine had these symptoms and it was the drop links. £18.00 each side, for the price I would change them anyway just to see Dont know
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tb1880
Newbie


Joined: 02 Aug 2014
Posts: 6
Location: London


PostPosted: Fri Oct 09, 2015 5:51 pm    Post subject: Reply with quote

I have just sorted exactly the same problem on mine. Most things had been replaced over the last couple of years except the forked arms because when checked, they always seemed fine. The noise on mine was always from the off side and as you report, you could feel it through the steering wheel. All only noticeable after a few miles of driving.

Anyway, I ordered two replacements and changed the os arm first. Hey presto the noise has gone. I will do the ns arm this weekend.

As an aside, they are ridiculously easy to fit, two bolts only and not a lot to wrong really, just take care not to break the plastic deflector when you are removing and refitting it. It seems pretty sturdy though.

Hope that helps.
 
  
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glenwells
Silverstone


Joined: 20 Aug 2015
Posts: 137



PostPosted: Fri Oct 09, 2015 6:27 pm    Post subject: Reply with quote

Would put money on it being the NS tuning fork control arm. Been through exactly what you are doing now. I went for the ESP upgraded tuning fork control arms as they were a good price and looked to be more substbatial.
When the car is on ranks etc they appear ok but when they were off the car it was obvious they were shot.

Hope you sort it
Glen
 
  
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drabux
Nürburgring


Joined: 01 Oct 2014
Posts: 400
Location: Bath


PostPosted: Fri Oct 09, 2015 10:10 pm    Post subject: Reply with quote

Sounds very much like drop links to me!
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Robertb
Dijon


Joined: 01 Sep 2003
Posts: 7552
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Sat Oct 10, 2015 1:02 pm    Post subject: Reply with quote

Thanks folks, will try drop links as they are so cheap, and the other tuning fork... less cheap sadly.
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Mike!
Silverstone


Joined: 06 Nov 2013
Posts: 131



PostPosted: Mon Oct 12, 2015 7:24 am    Post subject: Reply with quote

When you change the droplink, check the bush round the anti-roll bar where it mounts to the body/bracket (two points). Rare to break away but do perish and can split or walk out the housing. Easy/cheap to replace with some PU ones. Worth a look when your down there anyway.

Like this: http://www.ebay.co.uk/itm/Porsche-911-996-97-05-Powerflex-Front-Anti-Roll-Bar-Bushes-21-5mm-PFF57-501-21-5-/140920093930?hash=item20cf7dfcea
 
  
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Robertb
Dijon


Joined: 01 Sep 2003
Posts: 7552
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Mon Oct 12, 2015 9:13 am    Post subject: Reply with quote

Cheers Mike, I'll have a look.

At this rate the car will have an entirely new front end! If it still rattles I will Sad
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wasz
Paul Ricard


Joined: 28 Dec 2012
Posts: 3051


1999 Porsche 996 Carrera 2

PostPosted: Mon Oct 12, 2015 9:32 am    Post subject: Reply with quote

Robertb wrote:
If it still rattles I will Sad


My money is still on inner track rod joints Wink
 
  
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Robertb
Dijon


Joined: 01 Sep 2003
Posts: 7552
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Mon Oct 12, 2015 10:38 am    Post subject: Reply with quote

Can someone help me with terminology here, or even point me toward a diagram...

inner track rod joints
inner tie rods
track rod ends

I think I'm ok with the two control arms and the drop links.

Question
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C11BRA
Hockenheim


Joined: 30 Mar 2015
Posts: 739
Location: North London. Herts.


PostPosted: Mon Oct 12, 2015 4:32 pm    Post subject: Reply with quote

Do 2wd cars have the tuning fork arms you mention? I have an annoying knock but no play in any component.

PS. 4WD front drop links are easy to fit. 2WD can be a nightmare as they double up as front strut pinch bolts. Mine were fused together. Needed drilling out both sides. 4WD uses a simple drop link.....so some good news.
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Robertb
Dijon


Joined: 01 Sep 2003
Posts: 7552
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Tue Oct 13, 2015 3:38 pm    Post subject: Reply with quote

The 2wd cars have the tuning fork arms too. Longitudinal control arm I think is their posh name.

Anyway, car booked in for minor service, and I've asked them to have a look for the noise.

The indy's first thought was droplinks, so we'll see.
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wasz
Paul Ricard


Joined: 28 Dec 2012
Posts: 3051


1999 Porsche 996 Carrera 2

PostPosted: Wed Oct 14, 2015 9:30 am    Post subject: Reply with quote

Robertb wrote:
Can someone help me with terminology here, or even point me toward a diagram...

inner track rod joints
inner tie rods
track rod ends

I think I'm ok with the two control arms and the drop links.

Question


Tie rod and track rod are two names for the same thing. The "rod" that connects steering rack to hub. The inner joints (part 6) screw into the steering rack, covered by the rack boot. The outer joint (track rod end, part 8 ) connects it to the hub via a taper.




I reckon your knock is part 6. As the steering fluid heats up the tolerance of the ball joint changes and you get a knock, not present at all when cold. I had it and couldn't feel any play at all when the car was in the air. It almost drove me crazy trying to find the knock - I had replaced everything else.

Better to eliminate the simpler fixes first like roll bar joints etc (your car will probably need them soon enough anyway) but if it really only happens when the car is warmed up then I bet is these inner joints.

If you do them yourself be sure to use threadlock on them as for some reason they don't have a locking tab like every other car.....
 
  
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Robertb
Dijon


Joined: 01 Sep 2003
Posts: 7552
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Wed Oct 14, 2015 9:42 am    Post subject: Reply with quote

Cheers, that makes sense now. I'm guessing that part could not be replaced without potentially upsetting the geo.

Typically, its all gone blissfully quiet now, perhaps because of the cooler weather. Needless to say it will make diagnosing the fault more tricky...
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"911- the guilt-free supercar"

Current: 2003 C4S Coupe, seal/black

Ex: '02 C4S Coupe, '96 993 Targa, '88 Carrera Sport Coupe
 
  
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wasz
Paul Ricard


Joined: 28 Dec 2012
Posts: 3051


1999 Porsche 996 Carrera 2

PostPosted: Wed Oct 14, 2015 11:31 am    Post subject: Reply with quote

Robertb wrote:
Typically, its all gone blissfully quiet now, perhaps because of the cooler weather. Needless to say it will make diagnosing the fault more tricky...


Mine got steadily worse, until after a track day (and associated heat) I though my car was going to fall apart it was knocking so much.

The next day it was totally fine first thing until warmed up!
 
  
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Robertb
Dijon


Joined: 01 Sep 2003
Posts: 7552
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Wed Oct 26, 2016 12:45 pm    Post subject: Reply with quote

OK, so got to the bottom of the noise, unexpectedly.

The winner is- a new front n/s coffin arm, to replace the new coffin arm I fitted only 4k miles ago, which must have been faulty. The rubber bushing had completely split and it failed an MOT on it.Mad

It might also have been the undertray rattling as he tightened that up, but he said it was unlikely to have been that but you never know.

Anyway its sorted, happy days.
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