[Zedn]

Thanks for the responses.

I put 20lt of fresh fuel in before trying to start it. It has power at coil banks and injectors.

Sambo, interesting what you say about voltage drop. I measured the cranking voltage at the ignition feed to the ecu and during crank it was dropping a fair bit. Can't remember how much, but I think down to 10volts. I have it wired with a relay for the start button that connects power supply to the starter solonoid. The power for the starter switch comes from the ignition switch, but the power the relay connects is constant.

Engine turns over fine. Fuel pump operates normally and is supplying pressure to the rails, Ecu is getting power for both switched and constant sections of its fuse block, no fuses are blown, checked all connectors and earth, there is power at the coil bank plugs and injector plugs.

Everything to me points to crank or cam sensor. I want to scan before just replacing parts. I have now moved the car by trailer so rush is over. I think I will buy a scanner and see if it shows cranking rpm. That will tell me if the crank sensor works. I haven't got my tacho working yet or that would have told me also.

Might try run another power wire to the ecu and see if it helps