David, sounds like you on the trail of the problem, HOWEVER,
I would not stop yet. Here's my view of the problem. Yes, the EC2
will draw some current if the power to the injectors are on, but it should be
on the order of milliamps. If you are using the Peak and Hold (low
impedance) injectors they require around 4 amps to unseat the pentle and inject
fuel. The high impedance injectors require around 2 amps. The EC2
power requirements with the engine off is minimal - in the milliamp
range. I could be wrong, but to the best of my knowledge,
the EC2 should not be drawing enough current to unseat the injectors
unless the engine is running.
Your diagnoses appears reasonable except the EC2 just does
not normally
draw anywhere near sufficient current to unseat the injectors. I can turn
my injectors on - leaving the EC2 switch off - there is an initial squirt of
fuel due to the transit phenomena I mentioned, but after that the injectors
stay seated. Yes, the EC2 program light is on showing the EC2 is drawing
power through the injector power circuit the same as yours.
However, your finding sounds significant. I would not
hesitate to query Tracy about what you have found, it does not sound normal to
me.