Hi,
I noticed a new sound today from my 1992 900S. It's a sort of rhythmic clicking noise. It occurs only when the car is in gear with the clutch out. The frequency changes with engine RPM (and therefore wheel speed), and is roughly 4 or 5 per second around 1200 RPM. I was unable to determine whether it is any slower in higher gears. No change when turning the wheels. It is most noticable when there is pressure on the drivetrain (especially engine braking in lower gears). The car has about 130k or 135k miles on it, and has had the right inner driver and clutch (and lots of other things too) replaced. The gearbox oil was switched to synthetic (BG Synchroshift) with the inner driver job.
So, is this likely to be transmission or drive axle related? Also, I'd like to know if this sounds like an imminent failure item to anyone. All input welcome.
Thanks,
John