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In contrast to what previous posters are saying, the Q4 system actually does make some noises from time to time.


When listening carefully, you can hear the pressure relief valve opening a few seconds after start-up when the hydraulic system is pressurized up to ~ 85 bars.

As soon as the pressure is reached, a valve re-routes oil back to the oil reservoir instead of the hydraulic storage unit (mounted behind rear-bumper on right side).

This can be heard as a Clunk / Clinking sound.

Also when really thrashing the Q4 system, you can hear some clunking in the drive-line when the system regulates the amount of torque, but under normal driving you should not hear this.

Most important when looking at a Q4 is to see if the Q4 light comes on on the dashboard and stays off during driving.

cheers
 

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If there are any qualified Alfa mechanic there, I would let them give a complete analysis. It would be well worth paying him for an hour of his time than finding out you just bought a headache.

You need not just any qualified Alfa mechanic, but one with real Q4 knowledge, and they are very, very hard to find. ;)
 
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