Dear ventopians
Went to palace cross for rear parcel rattle check .. Again

. It's kind of fixed as of now. But that is secondary.
Primary news: I was hanging around the car at the service bay and saw some internal mail being displayed at the notice board. The mail was from VW internal training and R&D department to all service heads. It stated;
"As of 15 NOV 2012, VW has released a update for ECU for customers complaining about
- cold start knocking
- cold start misfire noise"
As the mail was too recent, I just wanted to try this update. After convincing the SA to update it for me ( he was reluctant earlier as he said it needs an appointment) I finally got it
The steps are as follows
1. SA will take your VIN and then check real time online for applicable updates.
2. The system will promptly provide ECU update required prompt.
3. It will give 3 options, basically 3 combinations of old and new sw versions. Your car's ecu will match atleast 1 of the old sw versions. The SA will note the corresponding new version number
4. SA will connect the VAG to your cars OBD, then will do a standard test. Post that, he will specifically select the sw version for ecu to update ( which was discovered in step 3)
5. The VAG will also have Internet connection and hence will download the sw real time from Internet!
6. For all the above process, the car has its ignition on ( without the engine being started)
7. The update will clear all historical ecu counters, so it's like complete ecu reset with new map.
Please note, you will not loose any settings and also will not loose any function like speed lock etc. summary: old sw ver: 9225 new version : 9811
Just about when I thought its over and was happy, the SA tool out his magic diary any looked for another code. I asked if Every thing was ok? He said, we would also update the injector settings ( "for reduced knocking of the Diesel engine... tak tak tak sound") I was more than glad to do it.
This time it was more animated update

1. The OBD connection was made
2. The sw number was selected
3. Alas the system threw an error! "Fuel too less- need at least 10 litres" I was shocked! What has diesel got to do with sw update. (Read on and you will know) any ways I rushed with the SA to nearest pump, filled up and returned. It was like a F1 pit stop
4. Reconnected OBD, selected sw, The system instructed the gear to be put on neutral,Depress brakes and start the engine. once started the system instructed to press accelerator fully ( please note in neutral the vento ecu restricts rpm throttling to 2600 rpm) moment this max rpm was reached, the system took over! The SA CAME OUT OF THE CAR. What followed was scary, the VAG was now in control of the car, it was like "ghost in the machine" movie. The VAG was instructing the car to accelerate - decelerate- accelerate ( between idle and 2k and then back to idle)
All this while the VAG screen said" calibrating valves - 40 remaining, 39 remaining and so on) - I didn't know there are 40 valves in a 4 cylinder Diesel engine? 40 injectors? Or 4 injectors - 10 valves each?
All this while it showed the pressure for each injector in Hg.
Once all valves were calibrated- it starred the minimum torque test ( torque at idle). All this while the car was accelerating - decelerating-accelerating ( between idle and 2k and then back to idle) - now you know why diesel was needed for this update
Ok - the screen said the minimum torque at idle is 15nm, recommended is 30nm. My results - 29.7 nm
So all was done! The engine stopped cycling and good all was over.
Tried the cold start today - was much less clattering. Will check again tommorow.
Thanks for reading