Hi I just fitted new engine to my esc cos and now has no spark. If i put a plug in one of the leads you get a small spark when you turn on and off the ignition but nothing while cranking. pump doesn't prime unless I unplug the blue sensor on passage side of block the pump will prime but as soon as I plug it back in it stops. running out of idea's now

 

Led diagnostic?

Or check all wires from sensors to ECU ( distributor cap and crank pulley )

Do you have power on injectors while starting? (use small light bulb for test)