How do I determine the top dead center (TDC) is an easy task with Picoscope if you have the right information from the vehicle manufacturers.
After have done some internet research I found that this particular engine uses a reference mark at the flywheel at 90 degrees before top dead center (BTDC). And here comes the easy part !!!. Down at the bottom of your picoscope screen are there a " ruler settings" icon - try to play with those settings.
To help you a little, try my way first.
What I did was to place the two degree ruler over two revolution (2 RPM) or 720 degree - measured at crank position sensor (CRK) as shown in this picture. Next thing you should do is to change the "Rotation Partition" to 8 which changes the interval to 90 degree and you should see the result right away.
It is quite fun to play with the ruler settings and now that you know where your TDC are at this engine you can begin measure the injection point in regards to TDC. I measured the first two injection points and the first takes place at 3 degree before top dead center (BTDC) and the second at 1.831 degrees after top dead center (ATDC).
With degree ruler fixed at the crank position sensor waveform is it a matter of how to use the "time ruler" together with the "degree ruler".
Do not change the position of the "degree ruler" at first, but use the "Time ruler" as you wish. It can be placed anywhere and will show the degree difference between the two ruler right away.
I don't know whether or not this will help you diagnosing your problem - it may be related to other issues such as calibration of the injectors - just a thought.
Is there any history or record on this car - I´m thinking about trouble codes !!!