380SL Running Rich Issue

[Lernend05]

Hi all,
I have problems with my 380SL. It is generally in good shape and engine/all areas very clean with around 100k miles. I live and tried to pass smog test after purchasing and failed (results below). Car always starts in an instant regardless of all circumstances but just generally smells rich all the time (post warm-up included) which is consistent with results. After spent around 2 days reading and checking, I thought of purge valve based on Symptoms of Bad Purge Valve in Car Engine. Of course, it's not just that. I also did something and made some records.

I have replaced the below:
O2 Sensor
Spark plugs (previous were fairly fouled and not copper)
Oil

Have excellent service records and the relevant recent replacements have been completed:
Injectors 5k miles ago
Air filter 5k miles ago
Fuel filter/pump 10k miles ago
Ignition cap / cables seem to be fairly new
Cat converter/exhaust 5k miles ago (strange how I got massive numbers from smog with this)

Is any ideas about it? Thanks in advance.