Interesting. Factory service literature says otherwise so thanks for the feedback. I don't blame you for stopping the fight.

I have not tried to operate an OBDII controller without spark. With no further information I would suspect the spark outputs will not affect fuel outputs. Batch fueling is the default when the CAM...

Interesting to note. Are you talking about the AFR? Or the spark timing?

knumcyl is a divisor and lower number of cylinders results in a higher value. Three cylinder is 96d or 60h.

Agreed. Getting it to run is a good plateau to rest on. Fuel pressure at 12-13 psi is good. I'd aim for as much common ground between the two systems as possible. Do you have the info to change...

Congratulations!!! How long before you can start driving and tuning?

They should as long as RPM isn't too high. Minimum angle between cylinders is 90 degrees just like a V8. Six cylinder dwell is 30-35 degrees so if spark advance is limited to 30-35 degrees max I...

I learned that Maserati's approach to odd fire was to use dual coils connected to a single distributor. The 225 will likely never see the same RPM as the Maserati and will likely never have a dwell...

Is there a cam sensor or synchronizing sensor involved?

The ignition module does not care what engine it is used on. It's not the problem. In bypass mode it only knows pulse out, pulse in. The problem is how the ecm interprets signals from the ICM. ...

Congratulations! I think you'd need a scope or another tool to display the spark signals and be able to tell if they're spaced appropriately. But if they're coming from different pickup coils then...

Measuring between REF and GND gives a "known" or reference voltage. Second measurement between W and GND gives signal voltage. Then ECM can be programmed with max and min allowed values so if...

Well, now, that's a fine question. The ecm measures between W and GND so the voltage it sees will never be negative. But it could look negative if you measure between 12V and W. This measurement...

http://fddrsn.net/pcomp/examples/potentiometers.html
Potentiometer and description of operation. A would be 5V, B would ground, W would be connected to the signal.
This is exactly what a TPS is....

1) ECM will monitor voltage.
2) Extra? Both of those sensors can be thought of as potentiometers. The 5V reference is "split" between ground and the signal wires. When the resistance between the...

Actually, only one ECM should control the IAC. ECM gets no feedback about IAC position. It only knows what it has commanded for counts. A sticking or unresponsive IAC or in this case, and ecm...