mark-d

Well-Known Member
hi guys, I have put a p38 gems engine in my 90 I have had the ECU programmed to delete the immobilser function and have wired a ignition relay main relay and fuel pump relay.

Before having the ECU coded I had no EML obviously because it was immobilized, now I do have the EML coming on but it doesn't start, the fuel pump is coming on for a few seconds at ignition on and then while cranking.

How is the coil powered? Is it through the ECU or should there be a power supply somewhere? I feel I miss something in this area but not sure where. The earths are all connected as far as I know, well from ECU at least and the engine has a good earth
 
Also I can't find a home for this plug, it's just behind the coil pack not sure if it's related

image.jpeg
image.jpeg
 
That looks like the plug to the coil packs, coil packs work by having a 12 v feed and the ecu earths each pack when firing, so 4 earths from each coil pack to ecu as it's wasted spark, and a live to the four coil packs
 
Thanks, this plug seams to be for the rear o2 sensors

My starting issue looks to be because I have no rpm signal
 

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