I want to check the timing with the pico but there are no example wave forms for this engine.
Can anyone help me to post a example waveform from a good engine?
What about measuring timing on bank 1? Would that be that different?
Why were timing chains replaced? Were the faultcodes present before change?
Opel OPC, that is an expensive job I would say.
Do a relative compression test with an amps clamp. If timing is off on a V6 you Will see one bank with higher/lower compression compared to the other bank.