Hey guys, I have a problem with an E36 318is ill try to explain as simply as possible with some images. basically i have a 318is that needed some attention clutch, starter etc mess under the intake ive done it all before many times the wiring loom was a bit untidy so i chucked that as i have a donor in my yard. im repairing the red car and the green is the donor. Red car was starting and driving but running poorly at idle now it does not start and i have no engine management light. i replaced clutch, starter, engine harness DME, new spark plugs,prop shaft. removed mess under intake


Notable differences
the red car has a single coil pack split into 4 and one round plug OEM

the green car had individual coils with individual plugs OEM left of pic

the DME on the left is from the green car the one on right is from the red car

the BODY harness to engine harness plug has 3 extra pins on the GREEN car pins 4,5,6 when i traced these wires into the cabin they ended up at unused plugs hence do nothing on the green car "i may need to confirm that for pin 6 the pink with grey striped wire"
inside view

underside view

Now the same BODY plug on the RED car does not have these 3 pins
inside view
apart from these differences the engines are identical same knock sensors same tps same wts afmx2 cam and crank triggers etc etc. I have used the GREEN components in the red car the firing order is 1342 i have arranged the coils as per red car setup i assume is the same in most/all M4x setups i havent seen different
coil 1 cyl 1
coil 2 cyl 2
coil 3 cyl 3
coil 4 cyl 4
the 3 wire connectors are connected as they were on the green car so the DME will determine firing order

I have no engine management light and the car wont start. it rained lightly when i was working but both DMEs are bone dry. all fuses in main box of red car are fine could i have a relay issue or perhaps popped a fuse somewhere inside the car.I can probably figure this out but some help from accomplished M4x owners might get me
sorted sooner ill update with vin details from both cars later if thats a help. Thanks for reading.