[edited!]
Just a thought.. at the moment i can disable mine by just fiddling with those relays and wires even with new relays in.. crunchy wiring suspected but bending fixes it..
Dunno how brave or desperate you've got but i know sticking 12v on the lambda-heater +ve feed bypasses the ecu fuel relay control. Then 12v on the dizzy +ve, That all spins the pumps and should spark if the ecu is listening...
It was immobiliser experiences got me and Matt to find that out last week wondering why the heater was cold etc, mine only disables the starter his does this relay
..
I only say the lambda heater because we were playing with it at the time, use the relay socket itself if you can but bear in mind switching the engine off off might involve pulling the wire out again....
*Use an appropriate fuse* on the bit of test wire you use, it's only to try to get things spinning but always wise (but I often never do!). I'd use a 10ish Amp, and keep it *safe*… Once you see a spark you're there probably...
Cool
Neal