Since getting this car 9 months or so ago I have done about 22k miles over which time I have noticed a steadily worsening vibration.
At low speeds on a smooth glassy road surface all is well though if the surface is coarse then a vibration is felt. At high speeds there is a kind of thrum through the car. Larger bumps etc are handled well.
The suspension etc has been given a clean bill of health.
More recently there has been a kind of chattering noise between gears and a rattle when traversing sharp bumps, rumble strips etc.
The inner CV joints are showing signs of wear, when grasping either driveshaft and pulling it back and forth it pivots around the outer CV joint as the inner joint moves by a few mm and clicks at the same time. This would explain the chattering noise between gears and the rattle however I want to be clear that this may also explain the vibration.
My theory is that on a smooth surface the CV joint is rotating smoothly though small, high frequency movements in the suspension caused by a course road surface induce movement in the CV joints which is felt as vibration.
Does this all make sense?
Thanks.
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Ford Focus ST - 07 2.5 Inner CV joint we.. new
Ford Focus ST - 07 2.5 Inner CV joint .. new