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Author Subject: Unstable at speed
lewisdmz

Senior User

Location: plymouth

Registered: 25 Jul 2009

Posts: 504

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Post #1
Hi,

The 6 has been feeling pretty damn unstable recently, when driving at anything over 70ish on b roads it's become a real effort to keep the thing on the tarmac. It seems like i'm fighting against every undulation. Even something like crossing the cats eyes is enough to make it change direction quite dramatically (more than expected anyway).

I'm inclined to think it could be rear beam mounts because:

1.

Rear toe is a bit out.

2. It does feel like the rear is a bit disconnected to the front

3. Sometimes I get a slight knock from the rear at slow speed, normally it only does it a few times at the start of a journey.

I've recently had new tyres on the rear which hasn't seemed to make any difference, if anything it's worse. Also recently had new complete wishbones and droplinks.

Is there anything else worth investigating before shelling out for new mounts? (would love to get gen Peugeot but they're a bit too dear so it may be solids instead).

Thanks in advance
Posted 22nd May 2011 at 20:57
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adam b

Seasoned Pro

Location: The Nam

Registered: 24 Jan 2006

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Post #2
Jack up the rear and see if there is any play in the bearings. Could well be the mounts though.

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Posted 22nd May 2011 at 21:34
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lewisdmz

Senior User

Location: plymouth

Registered: 25 Jul 2009

Posts: 504

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Post #3
adam b wrote:
Jack up the rear and see if there is any play in the bearings. Could well be the mounts though.


I've had it up and tested both wheels, no movement if your hands are at 12 and 6 or 3 and 9.
Posted 22nd May 2011 at 21:44
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jeffers Forum Admin

Location: Leeds

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Post #4
Wishbone bushes??

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Posted 24th May 2011 at 17:30
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mark.evs

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Location: Near Bridgend

Registered: 21 Dec 2010

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Post #5
Check your front suspension again, had similar faults due to worn hubs and ball joints. even hubs cracking after a new arm is fitted.

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Posted 24th May 2011 at 21:54
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adam b

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Post #6
Tyre type and pressures?

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Posted 24th May 2011 at 21:15
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welshpug!

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Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #7
knock from the rear could be the forwards beam mounts, which would allow the whole beam to move about quite easily.

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Posted 24th May 2011 at 21:30
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lewisdmz

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Location: plymouth

Registered: 25 Jul 2009

Posts: 504

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Post #8
welshpug! wrote:
knock from the rear could be the forwards beam mounts, which would allow the whole beam to move about quite easily.


Hmm yes, on closer listening i really can't tell if it's from the front or rear, sometimes it's a knock, sometimes more of a squeak from top strut mount area. Argg.

jeffers wrote:
Wishbone bushes??


Whole new Lemforder wishbones done about 1000 miles ago.

mark.evs wrote:
Check your front suspension again, had similar faults due to worn hubs and ball joints. even hubs cracking after a new arm is fitted.


Hmm, wouldn't there be movement in the front wheel if hub/balljoint was at fault though?

adam b wrote:
Tyre type and pressures?


rears are new hankook ventus v12 at 34psi. fronts are two odd conti something or others with 5mm of tread, 35psi. Front tyres probably aren't helping matters tbh.
Posted 24th May 2011 at 23:33
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tvrfan007

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Post #9
Check your beam mounts are even tight. Smile

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Posted 25th May 2011 at 11:01
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jimbamboon

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Location: Guildford

Registered: 15 Mar 2006

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Post #10
did you track down the issue, sounds like what im experiencing and i just replaced wishbones and bushes.

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Posted 8th Jun 2011 at 02:04
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lewisdmz

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Location: plymouth

Registered: 25 Jul 2009

Posts: 504

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Post #11
no not yet. I think i have three seperate noises, one is rear beam mounts, the other is a creak from top mounts when turning at slow speed, the other sounds more like a crack from the top engine mount. (i've tried to rock the engine by hand but the mount seems good).

Rear beam mounts are on the way, will report back when they are fitted.
Posted 9th Jun 2011 at 00:32
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daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

Posts: 8,648

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Post #12
lewisdmz wrote:
no not yet. I think i have three seperate noises, one is rear beam mounts, the other is a creak from top mounts when turning at slow speed, the other sounds more like a crack from the top engine mount. (i've tried to rock the engine by hand but the mount seems good).

Rear beam mounts are on the way, will report back when they are fitted.


See my sale thread if you fancy a reliable chassis/engine mount repair Smile

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Posted 9th Jun 2011 at 00:53
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lewisdmz

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Location: plymouth

Registered: 25 Jul 2009

Posts: 504

Status: Offline
Post #13
daveyboy wrote:
lewisdmz wrote:
no not yet. I think i have three seperate noises, one is rear beam mounts, the other is a creak from top mounts when turning at slow speed, the other sounds more like a crack from the top engine mount. (i've tried to rock the engine by hand but the mount seems good).

Rear beam mounts are on the way, will report back when they are fitted.


See my sale thread if you fancy a reliable chassis/engine mount repair Smile


Will do chap, want to take the top mount apart first to check the condition of the cup bit as I may be completely wrong.
Posted 9th Jun 2011 at 02:44
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