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740 will not start 700 1990

Ok, so how do I go about finding out if it is the ecu or not.I don't really mind the patch repair. I could mount the switch in the dash somewhere, but I would hate to do that if it is something else. It looks like the crank position sensor is working also. You can see the tach jump when trying to start the car. Also, the pump relay will turn the pump off about 5 seconds after turning the key off, even with my patch repair switch still on. When I turn the key on but don't start the engine the pump will run constantly.I'm not sure what to check next.Thanks for the info.






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