The only thing I can recall that is  unique to controller A is the inlet air temperature sensor.  Controller A has a temperature sensor and controller B does not.  While it does have some effect on the pulse duration, its effect is normally fairly small compared to the manifold pressure effect.  But, I wonder if that has been checked? 

The very first thing was to check the temp sensor.  Resistance measured about right; but replaced it with a fixed 10K resistor – no change.

 

Tracy says I don’t necessarily have the most problems; but I get the prize for the weirdest problems.

 

Likely the unique thing about my electrical system is redundant, independent power circuits for the EC2, and each set of injectors and coils.  The power sources are isolated with diodes.  There may be things about the internal circuit design that could normally drain noise peaks back to the power side to dissipate in the battery, so it is possible that; because the diodes don’t allow that, it is more susceptible to noise in my setup.  I’m not willing to give up the redundancy, and hesitate to replace the isolating diodes with less reliable relays.  We have handled the problem in other ways.

 

The RF issue I had (engine flooding during radio transmission) was tracked to the MAP pressure sender circuit. Adding a capacitor solved that problem (Tracy has added this change as well).  This would likely occur in composite aircraft.

 

Al