2.8 liters have a harness that goes under the engine from the crank sensor to the module. thay have had recurant problems with this harness. it is availble through gm parts div. or you can make one if you have access to weatherpack conectorrs
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did you prove ignition try a timing light to verify its flashing to speed of motor , next try a little spray of starting fluid, if it starts then you know its a lack of fuel problem ,there is no reason that you wouldn't get it to do something.if it has spark and fuel
Won't turn over? Do you mean the starter won't crank the engine over?
Or the engine cranks over and won't start, and you have tested for spark when cranking and have no spark? And then you have tested the coil and ignition module, and they tested out good? Am I on the right page here? If so, maybe the next thing to check would be the crank position sensor. The ecu (computer) signals the ignitor (ignition module) when to initiate spark after it digests the signals from the crank position sensor and the cam position sensor.
You where deffinetely on the right track with the module. The other component I would suspect is the crank sensor. This can be tested with a lab scope. You should have a five volt square wave from this sensor if it is working properly.
It's also not a bad idea to make sure the module is recieving ignition power and to make sure the connector pins are clean, free of damage, and not burnt up or corroded.
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Have you checked the ignitor on the car some of these have one mounted right next to the coil and they will stop it from getting fire. Also check cam and crank sensors and ensure they are sending out a signal.
You said you changed the ecm module, is that the ecm or the ignition module. Do you have access to a scanner to check cranking rpm? That way you can test the new crank sensor and the wiring and the ignition module.