Hi

Need some help with injector waveform
go easy its my first pico upload!
this alfa misfires intermittently but once rolling runs perfect until ecm comes on
faults retrieved during serial link combustion failure cylinder 1, ignition failure cyl 1
tests so far compression's,smoked manifold
fell into trap of stuffing a coil on
had new plugs,scoped coils all perfect
on scoping number2 injector at the end of event you can see a large "step"as the voltage drops Nos 3 & 4 do the same pic 1




however number 1 doesn't have this step during voltage drop off pic 2, any ideas whats happening at that time
i would normally swap injectors at this point but they are not a quick job




your thoughts ?