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I would start with swapping the electronic part of the old AFM into the Lex AFM. The electronics are the same and you know the old one works I presume.

I don't understand your reply about the STA signal. This signal is important as it tells the ECU that the car is being started and despite the airflow being below the specified threshold for the emergency fuel cutoff that it should power the pump and injectors for a set period of time. At least this is my understanding of how it's applied in the 7M-GTE's case. The timing light on the injector wires is to ensure that they are getting a proper signal when cranking. If you know it's getting fuel then this probably doesn't matter.

As I reflect I feel that the explosion may have been either due to the ignition timing being wildly off from the mechanical timing OR the injectors are firing way out of order and fuel is pooling in the runners until that unfortunate spark lights one off. The injectors are low impedance right?

I wouldn't worry about keeping the other ECU in place. I don't think that's the issue... I could be wrong though.


I'll go back over this thread in its entirety tomorrow, think about it for a bit and try to see if I can think of anything specific which we've neglected. Have you verified that the injectors are connected in the proper order?