Member Since: 03 Mar 2023
Location: Nottingham
Posts: 27
Feeling every bump
After some advice,
I have a D4 MY2012 which really doesn't ride very well. I feel every bump in the road whether that's potholes, joins in the tarmac etc. It seems to feel worse at slower speeds, when I go over speed bumps at a faster speed it seems like the EAS does its job well.
I have GG AT3s all round running around 33 psi front and 35 psi rear.
I do have a fault with the compressor which is an issue with the exhaust on the compressor, the fault code is C1A13-64 - pressure does not decrease when venting gallery. The cars in next week to get this resolved, would this fault make the suspension really harsh? I wouldn't of thought so?
There's no knocks under breaking etc so I don't think the bushes have gone, I could be wrong though. The suspension keeps its height overnight and doesn't sag on any of the corners.
The cars at 115k, any thoughts, experience or advice would be appreciated.
24th Mar 2023 8:42 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8230
How long has it been like this?- how long have you owned it?It can when others can't,
It will when others won't,
It goes where others don't.
24th Mar 2023 9:16 pm
nigethecat
Member Since: 11 Sep 2016
Location: Marnoch
Posts: 4244
Has a previous owner fitted long life poly bushes? These give a stiffer (bumpier) ride…I want to see the sweets before I get into your windowless van... I'm not stupid!
Corris Grey D4 Commercial SE 2016
Zermatt Sliver 2007 D3 SE manual (gone)
Indus Silver D4 HSE 2015 (gone)
Bonatti Grey D3 HSE 2006 (gone)
White D3 S (LHD) 2007 (gone)
Firenze Red D4 HSE 2014 (gone)
Black RRS 3.6TDV8 2008 (gone)
Rusty Green Defender 110 1997 (gone)
Black FL2 HSE 2013 (gone)
24th Mar 2023 9:52 pm
Weyboat
Member Since: 13 Apr 2018
Location: Weymouth
Posts: 273
If you have low profile tyres fitted, you will lose the cushioning effect of the sidewalls.Gone 2016 Landmark D4
Current 2015 HSE D4 - AKA - 'Gandalf the Grey'
24th Mar 2023 9:56 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8230
nigethecat wrote:
Has a previous owner fitted long life poly bushes? These give a stiffer (bumpier) ride…
:thumbs-up: That’s exactly my thoughts or lower arms have been locked up while hanging not with weight on them.
Longy: I don’t think GGs are made in low profile!It can when others can't,
It will when others won't,
It goes where others don't.
25th Mar 2023 6:23 am
Longy
Member Since: 03 Mar 2023
Location: Nottingham
Posts: 27
Thanks all,
The cars fairly new to me, I brought it knowing it wasn't riding as well as it should (long story).
I'll get under the car today to see if there's polybushes fitted, and have a look around. My gut tells me it's either harder than OEM bushes or like you say they've been locked up whilst hanging.
I will replace I think in the coming weeks if that is the case, would I need to change all lower and upper control arms, or could I get away with front lower, rear upper?
25th Mar 2023 6:57 am
karsteb
Member Since: 10 Aug 2014
Location: Oslo
Posts: 12
Hard to tell. Using polybushes now and they seem about the same as oil bushings - a little stiffer but not much. "Feeling everyting on the road" leads me to think something is loose - maybe sway bar bushings? I changed the sway bar bushings at one point as the were worn... Think I would look at the oldest components first. Would be surprised if the conclusion are the upper arms, but what do I know...
My car does have a little oversteer which is nice in the turns, but uncomfortabale on the straights - suspecting the steering rods (which are on order), but could also be something in the rear.
26th Mar 2023 11:10 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8230
Longy:
Compressor not exhausting? - have you checked the pressure the system is working at? -unusual I know but it is possible that it is running at to high a pressure, also AMK software runs at a lower pressure than Hitachi, yours is on the boarder line for when the change was made.
Even if the bushes have gone it would not make the ride harsh, quite the contrary.It can when others can't,
It will when others won't,
It goes where others don't.
27th Mar 2023 7:26 am
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73086
And I thought this thread was going to be a cut&paste from mumsnet.
27th Mar 2023 7:36 am
Longy
Member Since: 03 Mar 2023
Location: Nottingham
Posts: 27
Just checked the gallery pressure - 330kpa?
Thes cars in on Friday to sort the compressor out so hopefully I can rule out anything compressor then.
27th Mar 2023 7:54 am
darrind
Member Since: 04 Jul 2008
Location: In A World of My Own!
Posts: 2892
Worth checking ride heights as it may have been set up at the wrong ride height - do you have access to an IID??Must stop buying shiny toys....
27th Mar 2023 4:04 pm
Longy
Member Since: 03 Mar 2023
Location: Nottingham
Posts: 27
Hi, thanks, I can check the ride height but can't calibrate it unfortunately, I've gone cheap with a Autel MaxiAP, alright I guess for 50 quid but is only good for reading codes, keep thinking I need to get a gap iid tool but can't face the price of them 😭
27th Mar 2023 5:05 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8230
You don’t need a diagnostic tool to check ride heights, just a tape measure and level ground although I don’t think that is your problem, if the ride height is lower than 22mm from standard it will automatically go into max height when access is selected.It can when others can't,
It will when others won't,
It goes where others don't.
27th Mar 2023 7:07 pm
Longy
Member Since: 03 Mar 2023
Location: Nottingham
Posts: 27
I'm thinking it's the struts just being old and tired. The cars on 115k miles.
Is this sort of the age they tend to require replacing?
Is there a definitive way of checking the struts to see if they're knackered? It's feels like all 4 are as bad as each other to me however would like to test so I can isolate the issue to the struts.
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