Join Date: Jul 2011
Location: Cologne, Germany
how odd. you swopped cap rotor and leads from the other car, so leads are likely ok.
the only thing that distributes the spark is the rotor in the distributor. The coil gets the tachymetric signal from a single white wire from the Ignition ECU (pin #1) to coil negative side (check. you have the whites on the coil negative?)
The coil is obviously delivering a spark to the distributor (or you will not have any spark at all)
You presently have plugs #1 & #4 sparking:
try swopping over lead 1 & 2 on the distributor cap (yes, you are putting them in the wrong order, but just do it to test)......is sparkplug 2 now sparking and 1 not? in other words do you now have plugs 2 & 4 sparking?
I have never heard of this before, but sounds likethe IGN ECU is only pulsing half what it should.
In which case swop over the IGN ECU from the other car.
Check though first, is the IGN ecu the correct one?: Bosch # 0 227 400 003
Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.