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The ECM will only pulse the injectors if it is getting all the inputs it requires, therefore check for crank/cam sensor inputs and other major signals.
At only 30,000? This is not good advertising for Aveo! At those no-pulse times, have you checked for power at an injector connector with key on? With a new ecm, I would not expect the injector ground circuit to be the problem, so maybe you could trace the injector drive circuit back from a wiring diagram. The injectors get power to them when the key is on. They only pulse when the ecm grounds them. good luck, ken.
There should be a purple wire with white tracer from ignition module to computer. That wire carries rpm signal to computer, w/o that signal, the computer won't ground the fuel injectors. With the engine cranking, you look for a dc pulse on that wire. If you have a digital multimeter that has a tach--duty cycle or dwell setting, it should react to a dc pulse.
My info on your model year, isn't that great.
DO YOU HAVE 12 VOLTS ON INJECTOR WIRE ON ONE SIDE WITH KEY ON? IF SO ARE YOU GETTING SPARK? IF YOU HAVE NEITHER YOU MAY NEED A NEW CRANK SENSOR. VERY COMMON ON THIS ENGINE WHEN THERE IS A LOSS OF SPARK AND INJECTOR PULSE. INJECTOR PULSE(GROUND SIDE)IS CONTROLLED BY THE COMPUTER. IF YOU HAVE SPARK BUT NO INJECTOR PULSE AND 12 VOLTS ON INJECTOR FEED WIRE YOU MAY HAVE A FAUTY ECM(ENGINE COMPUTER)
Check the fuse for the injectors, some vehicles have the injectors and coil running on the same circut, at the same time check the fuse for the ignition.
Mine had a similar problem, there is a wire that goes from the computer to the fuel rail and this wire sends info on how much fuel and when to inject the fuel... if that wire is grounding out then this will cause the lack of cylinders to fire and also explain the inconsistency. So i would start with the fuel rail..hope this is of some help
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