Z3 vibrations

[Inferno]

I have noticed a change of rolling quality recently, whole car and steering wheel vibrates especially in the range between 100-140 km/h and tyre pressures are dropping quite often. New tyres? Alloys needs fixing? Bushings? Car needs allignment?

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[colb]

Could be any of the things you have listed, inspection of wheels tyres and suspension steering joints and ball joints should reveal whats going on to cause the vibration. First check would be to see if you have lost any balance weights from the wheels or just have the wheels balanced to see if that cures it. Loss of tyre pressure may point to rim corrosion around the tyre bead resulting in a slow leak and loss of pressure.
Tyres would need to be taken off the rims to check if this is the cause and cleaning up any corrosion found before refitting the tyres.
If the cause is any of the steering or suspension joints then inspection of these should reveal any play, best done with the car raised off the ground and by rocking the wheel around and pulling and pushing it in and out whilst looking at the joints, ball joints to detect any movement that may be evident. Any worn joints should be replaced followed by an alignment check. Pay particular attention to the steering track rods at both ends you may have worn joints that are causing the vibration.

Colb

[Inferno]

Thanks for the reply, all the joints and bushings have been checked 2 months ago and they are in good condition.. also wheel weights was checked and replaced 3 months ago but only in the rear wheels

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[colb]

Brest get the fronts balanced then as a first step.

Colb

[Inferno]

Thank's i will start from there. Most logical problem i think should be the wheel weights because the problem appears in the exact range 100-140 km/h. After 140kph car rolls smoothly..

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[colb]

Yes from what you say it sounds like fronts are out of balance particularly if it occurs at a set speed then disappears.
How old are the tyres and what condition are they in, if the tread is low or side walls weak it might be worth putting a new set on the front and have them balanced rather than mess about with the old tyres.

Colb

[Bonzo]

I have noticed a change of rolling quality recently, whole car and steering wheel vibrates especially in the range between 100-140 km/h and tyre pressures are dropping quite often. New tyres? Alloys needs fixing? Bushings? Car needs allignment?

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Didn't have a Beach Boys CD playing at the time did you?