actually i'm facing a much more interresting quest than
being sorry about a built in RD4, what's unable/not supposed
to play MP3s...
Actually, having driven my C4 HDI 110 about (only!) 350km
now I often notice a whining noise or sound, combined with a
sudden, but slight decelleration hit - about 1-2km/h less on
the speed meter. Hard to describe, but it sounds almost like
"stopping a slowly free turning bicycle tyre with a bare
hand"- a rather silent, bit grinding and high pitched sound
going from louder to silent...
The local Cit service is clueless. However I'm not alone
with this phaenomenon:
In my case, the noise begins (=total duration about 1 to 1,5
sec., combined with a sudden but very low deceleration
shock) when accelerating or decelerating from lower RPM
(=low, but far away from stalling the engine: about 1800 to
2300 RPM at the 3rd or 4th gear). It even may start suddenly
when driving for a while on a straight even road with low
throttle (=diesel consumption meter shows about 4ltrs per
100km) at 70 to 90 km/h at 4th gear. The effect does not
appear on neutral gear while standing or when the clutch has
been pressed down.
The service here promised to get more informations on
this... but they guess it's some harmless sort of
resonance- effect, caused by the vibration or fuel pressure
at lower RPM.
Would be interresting to hear if other C4 HDI drivers (or
even Benzin/Gas drivers) noticed this noise before...