Help needed please.. Ever since owning my z it has had a vibration at about 35-55mph like the tracking is way out (which its not). The strange thing is that it only does it until the car has warmed up 5-10 mins then will go completely. Until the next time its driven from cold. Anyone experianced the same?

Yes, my BMW experiences this, no-one can explain this for me, apart from the tyres may need to adjust after being parked in one positon, i.e they may become slightly egg shaped and need to adjust back to being round, hope that makes sense...

Why would this go when it warms up though?

:confused:

sounds like a prop centre bearing to me...

Why would this go when it warms up though?

:confused:

its the rubber bush in the centre bearing on the prop,when its cold its all stiff and dont move with the prop,when its all warmed up it allows the prop to find its own centre iff this makes any sense and seems to manifest its self more in the winter

Either it's not running on all 6 when it first starts up, or it's the prop support bearing. Most likely the latter I reckon.

Thanks I will get the prop support besring checked. Matt