I'm picking up bad vibrations

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S

steve pitts

New Member
Posts
11
Just started to notice a vibration which makes the whole car judder at around 25 - 35 mph.

I've narrowed it down to when the engine is under load, say going uphill and yet it is most pronounced when the car is decelerating, in fact the longer I leave the car to slow down the worse the vibrations become.

I've knocked the engine out of gear (not mis-firing) and I'm sure it's not brake related as I've tested this option by not applying the brakes and just letting the vehicle slow down.

I'm thinking UJ(s) or prop shaft, but would welcome an experienced opinion.

Many thanks in advance
 
I've no experience of this but have you considered an engine mount as the cause? Does it do it in neutral?
 
Hi

As anyone who has read my posts before knows I am not the most hands on of RR owners and I have a vibration problem when first getting up to speeds of say 65 until doing that speed for 10 minutes or so and it goes away only to return at 70 and so on and so forth.

I have no idea about the mechanics as I am working my way through the workshop manual but wondered if anyone could point me in the right direction as what could be the cause.

Cheers

Adam
 
Hi Doobs too

I'm fairly certain that it is transmission related, rather than a problem with the engine mountings or the engine 'missing'.

Having had a bit more time to determine when it happens -

The vibration kicks in when I accelerate, even at a fairly even pace and continues as I build up speed.

Once the car is at a constant speed, say 30 - 40mph, the vibration is much less pronounced - hardly noticeable.

As I ease off the gas and let the car coast, the vibration starts again immediately and is at it's worse at between 40 and 15mph as the car slows down.

During the coasting and slow-down, I've not applied the brakes and have knocked it out of drive and into neutral (automatic box), so no power delivery through the drive train and engine on tick over at approx. 700rpm.

The vibration is there only when the vehicle is moving.

The car (1995 4.6 HSE) has 150k mileage and as far as I know it has never had any major work on the gearbox, prop, difs or axles, so classic kev's suggestion is a distinct possiblity.

Any more ideas gratefully received.

Cheers
Steve
 
adamrharding said:
Again is this relevant to my problem with speed and juddering going away after a while.
Click to expand...

Well you won't know until you test it :rolleyes: I had very similar problems with a Cherokee and cured it by changing the damper, it's worth checking anyway and won't cost you anything to try it. :)
 
Tervueren said:
Well you won't know until you test it :rolleyes: I had very similar problems with a Cherokee and cured it by changing the damper, it's worth checking anyway and won't cost you anything to try it. :)
Click to expand...


Not at home so cannot consult the workshop manual, so how do I go about doing that? And if the damper was damaged why would the juddering go away after time?

I was thinking more oil flow or similar.
 
You won't need a workshop manual to check it. look underneath for what looks like a shock absorber, it's mounted transversely, disconnect one end and pull/push to check resistance it should be quite firm. Anything could set it off such as a bump in the road or wear somewhere else.
I'm not saying it's definitely your problem but at least it will isolate one option.
 
My problem turned out t be one of the UJs on the front prop shaft.

Replacing it has cured the problem, so thanks again for pointing me in the right direction.

Cheers
Steve
 
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