P38A Vibration.

swac said:

I have a new problem which started to manifest itself about a week ago but seems to be getting steadily worse.
I had a couple of new tyres fitted on the front about a month ago and the tracking adjusted as the old tyres had worn unevenly, I can't remember if it was the outside or inside edge.
Anyway the car has developed a vibration when I lift off the throttle, as soon as I put any power on it goes away but as soon as I lift off it comes back.
Have any of you any ideas of what it may be?

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swac said:

I have a new problem which started to manifest itself about a week ago but seems to be getting steadily worse.
I had a couple of new tyres fitted on the front about a month ago and the tracking adjusted as the old tyres had worn unevenly, I can't remember if it was the outside or inside edge.
Anyway the car has developed a vibration when I lift off the throttle, as soon as I put any power on it goes away but as soon as I lift off it comes back.
Have any of you any ideas of what it may be?

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Datatek said:

Viscous coupling seized or crank vibration damper breaking up for starters.

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swac said:

Thanks for the reply. I've just had a quick look but I can't see a crank vibration damper. My car is a V8 petrol version should it have one?

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Grrrrrr said:

+1 on Datatek.

If wear on outside edges then suspect viscous coupling is too stiff. Lift a front wheel and get a torque wrench on the hub-nut. In neutral you should be able to slowly tease the wheel round without the wrench clicking with about 70nm of force on the manual. Not tried the auto. If it takes more than 100nm then I would think it is getting a bit solid.

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