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Discussion Starter #1
As mentioned occassionally in other treads I have a problem with my 2002 Range Rover V8 Vogue in that although smooth and powerful there is a definate background vibration through the seat/car both when stationary in drive/reverse or driving at any speed. This leads to a numbing effect on my legs and feet on a long drive which is not a nice or relaxing feeling at all. This is a seperate issue to the diff or Shimmy issues covered elsewhere.

Any body else get the "Numbing effect" and what can be done about it....?
 

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any vehicle will have vibrations, perhaps you're just not in a good position inthe seat (either you, or the seat adjustment ) which is putting pressure on your legs so as to cause numbness.
 

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Discussion Starter #3
fisha said:
any vehicle will have vibrations, perhaps you're just not in a good position inthe seat (either you, or the seat adjustment ) which is putting pressure on your legs so as to cause numbness.
Starting to think you may be right as the vibes are not bad at all following new wheels & tyres I added to fix a 55-70mph steering wheel shimmy. May be getting paranoid and reading to many forums! :doh: :doh:
 

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also,how long are you sitting in the seat for? If you're doing long long trips, then without moving about regularly, then I get numb in any seat, including office chairs. My wife used to have a VW Polo, and no matter how I had the seat, after about 45 minutes, the sides of my upper thighs went numb. It was just a seat / car I didn't get on with.
 

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Discussion Starter #5
Local Land Rover Specialist confirmed that low profile tyres WILL increase general vibration when a gear is engaged on Diesel or Petrol cars. THey drove the car and said all was normal but higher profile tyres would reduce the (normal) background vibration.
 

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I have a separate post addressing this same concern. I had ZERO vibration/shimmy or the "numbing" effect you describe prior to the dealer doing the differential "fix" - ZERO. The dealer tried to blame it on the tires, but I recently have put on new tires and it has not fixed the problem - and I will be taking it back to the dealer soon. I will update afterwards.
 

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This is just a stab in the dark, but are you driving around without a spare tire in the trunk? I also noticed a pronouncing drone and numbing effect some weeks back when I drove around briefly without a spare tire in the usual place in the trunk. For some reason, the presence of the spare had an insulating effect on road/engine noise and vibration -- so much so that once I took the spare out for a few days to fit a new tire the difference was remarkable.

Just a thought.

ketel
 

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Discussion Starter #8
ketel said:
This is just a stab in the dark, but are you driving around without a spare tire in the trunk? I also noticed a pronouncing drone and numbing effect some weeks back when I drove around briefly without a spare tire in the usual place in the trunk. For some reason, the presence of the spare had an insulating effect on road/engine noise and vibration -- so much so that once I took the spare out for a few days to fit a new tire the difference was remarkable.

Just a thought.

ketel
Interesting but I have an LPG conversion with Donut Gas Tank in the spare wheel well!

The feeling is almost like the Engine Mounting Rubbers, or the Exhaust Mounting Rubbers, not doing there job 100% properly. I must strees that the car drives very smoothly and the vibe is mostly felt in my legs after longish trips but I also notice it at standstill and it goes away when shifted into Neutral or Park.
 

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Discussion Starter #9
Further to my original post I now have a Jaguar engined 2006 Model L322 (49K) and have another vibration issue.

When the Engine/Drive system is under load I get a vibration (almost harshness) through the floor under my seat and up into the seat. It just not a smooth as I feel it should be. After a motorway drive of just a few miles my legs start to tingle with the vibration which seems to be coming from the drive arrangements under the floor pan ( beneath my feet). The engine runs smoothly and I think I can isolate that.

There is no vibration through the steering wheel wheel at any speed so I am excluding balancing/tyres (I have stock 20" Alloys with 255/55 R20 Dunlop's)

The 6-Speed gearbox works fine and changes smoothly. Overrun seems smoother than when on the gas.

I cannot believe I have had two L322's in six months both which seem to have vibration issues . This is not a critical issue but if anybody has any ideas they would be greatly appreciated.
 

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Gazellio

switch back your phone into chime mode and the vibes will disappear ...

Sorry , not funny , but i had to write it anyway .. :D :D

Or another one , change the vibes by listening to the Beach Boys on the stereo .... Good vibrations ......

Sorry again , its an even worse one . :D

OK Istop .

Cheers !!

Jaybear
 

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Discussion Starter #11
jaybear said:
Gazellio

switch back your phone into chime mode and the vibes will disappear ...

Sorry , not funny , but i had to write it anyway .. :D :D

Or another one , change the vibes by listening to the Beach Boys on the stereo .... Good vibrations ......

Sorry again , its an even worse one . :D

OK Istop .

Cheers !!

Jaybear
Very Droll but even cheered up I would appreciate trying to isolate the vibration I feel that is spoiling my otherwise significant driving pleasure :lol:

PS: I have owned new RRS and New Dicovery3 and neither had ANY vibration through the floorpan/seat. Smooth as silk so I expect better from a FFRR cruise liner...
 

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Discussion Starter #12
Update:

The wife has today announced that she too can feel a significant vibration through the floor pan up through her feet. I had not told of the vibe so she self diagnosed so I am not going totally bonkers.

I have decided to take the car (Today) to a local Alignment/Balance specialist that deals with Prestige brands and get them to rebalance the wheels to rule out Torsional Vibration due to incorrect balance etc.

If no change then its on to the next possibility: The Drive System

The Harshness/Vibration is most apparent when the RR is under load and not so apparent on over run. Not sure what this tells me though?

I guess possibilities include:

Front Differential - seems unlikely on 2006 Model with 49K
Front or Rear Drive shafts - Could they really be out of balance on a newish model?
Transfer Box - No idea about problems with this.
Gearbox - Could a Gearbox Double flush be the answer? *

*Could my mysterious cooling fluid minor leak (half pint over 3-4 weeks) be related. Surely not possible that coolant is leaking into 6-speed box and effecting the Oil and lubrication leading to harshness?

I am very surprised that nobody else has experienced this underfloor vibration but any help on above warmly appreciated. :pray:
 

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Discussion Starter #13
Just back from Wheel Balancing Specialists. The Wheels were badly out of balance by: (15mg+ will cause vibration)

Front Left
Inner 25g
Outer 25g

Rear Left
Inner 25g
Outer 30g

Front Right
Inner 35g
Outer 50g

Rear Right
Inner 20g
Outer 0g

However although I now have no balance vibration the harshness/vibe felt through floor pan & Seat is still there :crybaby2:

Off the LR Garage to have drive shafts checked by hand tomorrow.

It almost feels like a scraping, I don't suppose it could be a disc or pad scraping/vibrating (Long shot I know)
 

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It sounds like you need to get a full four wheel laser allignnment done as well. The L322 is very sensitive to load and tyre pressure and the sensitivity has been increased by the diff upgrade. Try changing the tyre pressures significantly and or putting a significant load in the boot. The trouble with isolating the cause is that the suspension/transmission/tyres act a bit like a tuning fork and as you change the tuning of one component it retunes the whole system. Changing the type pressure changes the damping factor of one component as does changing the loading by changing the pressure in the air springs. A little fiddling around should give you the answer.
 

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Discussion Starter #15
L322HSE said:
It sounds like you need to get a full four wheel laser allignnment done as well. The L322 is very sensitive to load and tyre pressure and the sensitivity has been increased by the diff upgrade. Try changing the tyre pressures significantly and or putting a significant load in the boot. The trouble with isolating the cause is that the suspension/transmission/tyres act a bit like a tuning fork and as you change the tuning of one component it retunes the whole system. Changing the type pressure changes the damping factor of one component as does changing the loading by changing the pressure in the air springs. A little fiddling around should give you the answer.
Do you mean lower tyre pressures to absorb more vibration?
 

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In the origional post you mention it does it when stationary which pretty much means you can rule out anything that has mechanical motion when moving.. such as wheels , tyres , propshafts, etc etc.

If it does it only when in Drive / Reverse when stationary then this suggests an engine mount or a lead , cable hose rubbing where it shouldn't once the drive is engagded and the engine becomes under load, the engine does shift slightly on its mounts so any slack will be magnified.

Otherwise it suggests that the vibration is coming from the internals of the autobox. :shock: :?:

Another place I'd need to satify myself it isn't coming from is the seat motors, though why this would only happen in drive/reverse when stationary is beyond me and I suspect unklikley but its just the region of the source that makes me wonder. Is the passenger seat fine?? Unplug the motors (if its possible) and try a drive.
 

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Discussion Starter #17
Lee_D said:
In the origional post you mention it does it when stationary which pretty much means you can rule out anything that has mechanical motion when moving.. such as wheels , tyres , propshafts, etc etc.

If it does it only when in Drive / Reverse when stationary then this suggests an engine mount or a lead , cable hose rubbing where it shouldn't once the drive is engagded and the engine becomes under load, the engine does shift slightly on its mounts so any slack will be magnified.

Otherwise it suggests that the vibration is coming from the internals of the autobox. :shock: :?:

Another place I'd need to satify myself it isn't coming from is the seat motors, though why this would only happen in drive/reverse when stationary is beyond me and I suspect unklikley but its just the region of the source that makes me wonder. Is the passenger seat fine?? Unplug the motors (if its possible) and try a drive.
Thanks for all that - definitely Engine/Gearbox/Drive related and not the seat motor. The vibration is through the floor/chassis of the car. Its not awful but you know its there. I Engine mountings may be worth checking.
 

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Is currently doing the exact same. Have had wheels, discs, pads, wheel bearings checked but all good. Put the trailer on with the horses in for the first time and had to put the 5 spd autobox into manual mode otherwise it would judder under load. Took trailer off but left with judder under load, more so after 50mph. I'm guessing this is gearbox relateWed. Can you state how you fixed/diagnosed your problem? Thx Steve
 
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