My long suffering C8 has developed a new "issue" and, ahead of taking it in to see the doctor I can't help but wonder what it might be.
At first we noticed a ever louder whining noise, which seems to come from the transmission, and linked to engine speed (downshifting makes the revs rise, the pitch of the whine rise and increase in volume). The noise is now very noticeable on the over-run / under engine braking.
Now I have noticed that at idle in neutral, there is a similar, but less intrusive noise. I'm pretty sure that it is the same issue but without load. The noise goes away upon depressing the clutch pedal.
At first I suspected the clutch release bearing, but a noise from this wouldn't go away on pressing the clutch right? On the contrary, it is when it would be more noticeable?
Therefore, I am suspecting a gearbox bearing on the input side. Any known issues like this?
The car had a new clutch about 2 years / 50k kms ago, and it now has approx 210k kms.