Thanks for the update.:thumbsup:

dave w

Interesting; see attached.

dave w

When I change the cylinder select value, Hex address 0016 changes. I think changing the Hex value to 03 would be the correct value?

See attached screen shot for an example of a 3 cylinder BPW...

I'm curious about your data logging and tuning plans? Identical VE Tables in both '7747's? Identical Spark Table in both 7747's? Two Laptops with two ALDL cables? One Laptop with two TunerPro RT...

:wtg:

dave w

Best method to measure voltages / current / resistances, is with a test bench setup.:thumbsup:

dave w

I wonder about the IAC controls? I'm thinking only one ECM needs to control the IAC.

I wonder about reference voltages, like the 5 volts to the TPS. I wonder what each computer sees for a TPS...