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Plenty potential for catching wires tbh, although not really between ecu and engine, the exposed bits of loom are in the cabin rather than round the engine (with the exception of bits around the dash). And the car got wetter than usual in a big downpour - easily done with all glass and many seals removed and just lives under a tarp weighed down with tyres for waterproofing. So water damage to the electrics is definitely a suspected cause of them gremlins, especially in the glovebox area where the EWS and fuses live.
Only welding done was the battery cage, which was obviously done with battery disconnected.
We got it to crank by swapping the ignition unit (including RF key reader), ECU and EWS from another car.
I have two keys and neither worked. And There wasn’t really any work done on it between it being fine and it not working.
Literally started first time for 6 months then died when we go to trailer it lol.
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Nef
These 11th hour electrical gremlins are the stuff of nightmares, given me a blown clutch, gearbox, something in the driveline all day, hard work but you know what you need to do just have to get it, electrical stuff is mega frustrating.
Could be you've caught a wire somewhere when prepping, something between ecu/crank position/ignition comfort pack box or the RF reader on the ignition column, or key got damaged and thats caused it to not recognise it anymore. Done any welding recently?