Intermitant Vibration

[Guest]

Anyone got any suggestions as to what may cause vibration from the rear of the car when it drives with no vibration for ?? miles and then suddenly has a vibration start, whether or not the clutch is pressed or not, ie. when coasting it is still there.

It only seems to occur after driving for a while and when over 60mph, after it starts it is ther at any speed above or below that, but when it gets driven the next day it is not there till at least 5-10 miles covered ?

Any help / advise is appreciated - this ones really got me stumped for ideas right now.

Cheers

P.S. after it starts vibrating, i could swear the car is much easier to oversteer ?

 

[mik_ok]

ORIGINAL: 944 S2

P.S. after it starts vibrating, i could swear the car is much easier to oversteer ?

Sounds like a loose Antioversteeromatotron. [&:]

(sorry [] )

 

[mik_ok]

Vibration suddenly occuring after 10+ miles sounds like when the gearbox is getting up to temperature (?)

If you dip the clutch the box will still be spinning at "road speed". What happens if you slip into neutral at this point?

 

[Guest]

drove to work and nothing - no vibration

come home and nothing but after 2 minutes it started ?
if you press the clutch it still vibrates, if you take it out of gear and coast it still vibrates too ?

It has only once stopped vibrating after starting vibrating on the same journey - it is very noticable inside the car and very juddery, the fast you go the worse it is. Could it be as simple as a wheel not on tight ? yikes, i'm sure i checked them all when i last got the car back.

The only work to the rear end recently has been inspection of driverside handbrake shoes thinking they needed replaced, but all that was required was a replacement release spring, the other item was replacing the rear dampers.

Clutch bearing still rattles all the time, not much worse that it was 9 months ago and no clutch slip either.

The mystery continues ???

All help much appreciated.

 

[Fen]

I have no idea but what to suggest it is but I'd start by having the driver's side wheel off and checking everything looks OK in there if there was handbrake work going on recently in there. Other options maybe are CV bolts working loose (they need to be replaced if they have as they stretch and can only be torqued once) or something at the back of the torque tube?

 

[Guest]

ORIGINAL: Fen

I have no idea but what to suggest it is but I'd start by having the driver's side wheel off and checking everything looks OK in there if there was handbrake work going on recently in there. Other options maybe are CV bolts working loose (they need to be replaced if they have as they stretch and can only be torqued once) or something at the back of the torque tube?

cheers fen, i will try and get the car on the ramps this weekend - life with our first baby doesn't give me a lot of free time, the cars have never looked so dirty.

It is strange that it comes and goes though, isn't it ?

Cheers

 

[mik_ok]

ORIGINAL: 944 S2

if you press the clutch it still vibrates, if you take it out of gear and coast it still vibrates too ?

Which points away from the box internals..... but unfortunately doesn't help enormously.

Diff? Driveshafts? Possibles but I'd expect some reaction to power on/off if it was.

Or maybe as Fen has guessed - something at the handbrake? What happes if you
a/ brush the footbrake
b/ gently apply the handbrake

[&:]

 

[Guest]

ORIGINAL: mik_ok

ORIGINAL: 944 S2

if you press the clutch it still vibrates, if you take it out of gear and coast it still vibrates too ?

Which points away from the box internals..... but unfortunately doesn't help enormously.

Diff? Driveshafts? Possibles but I'd expect some reaction to power on/off if it was.

Or maybe as Fen has guessed - something at the handbrake? What happes if you
a/ brush the footbrake
b/ gently apply the handbrake

[&:]

okay;

a/ the car slows down eventually, sometimes a clunking noise as the calipers pres the pads, suggesting they are not fully releasing and need refurbished.
b/ not a lot apart from it's ot as fast to accelerate ?

2 trips to the office today - no vibrations,2 trips home and only vibration on the first one home. I did notice just before the vibration started that there was a small sudden knock noise but no feeling of movement when it happens.

 

[mik_ok]

I meant to say "when the vibration is there". []

Are your "a" and "b" answers during vibration?

 

[Guest]

vibration not been here for 2 days now ?

yes a and b were tested when the vibration was there and when it wasnt there - so it not related to either ?

 

[Guest]

Well no more vibration since last post either, whatever it was it seems to have gone completely ?

 

[mik_ok]

Maybe you should post about the very annoying lack of £1Million in used notes in the back seat, and see if it makes that "go away" too []

 

[mik_ok]

A colleague told me recently that they had a hire car which developed a noise / vibration from the wheel. They mentioned this when they took it back and the guy horsed it round the pound, and a coke can finally flew out (!) [&:]

 

[Hilux]

Is it road speed related to wheels or to gearbox. Any road speed related noise will be at least 1/3 the regularity of a gearbox/shaft noise.

Could be a rear wheel bearing.

Mine is fine until it `warms` up and the rum-rum-rum-rum noise is surprisingly loud with the window open and the sound bouncing back off the hedgerow etc. I also detect a vibration when cornering. On the track it manifested itself as a vibrtion when cornering as with crash hat on I couldnt hear it.

Alternatively it `could` be driveshaft on the way out or a propshaft? torque tube thing.

HTH

 

[Guest]

well it gets driven every day and it's not happened in the last 3 weeks