You really don't need much to make the run engine with the ECM. You will need a throttle position sensor, map sensor, engine temp sensor, and O2 sensor. The engine speed will come from the distributor. The main output control is pulsing the injectors. Timing will be controlled after the engine is running above 600 RPM. Until then the timing is done only by the distributor. The O2 sensor will only control fuel trim for better economy after the ECM goes into closed loop operation.
A few more things, such as an intake air temp sensor, may be needed depending on the ECM. You need to have enough of the required inputs to allow the ECM to enter closed loop.
This post was edited by Owen Aaland at 00:39:31 01/29/13.
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