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Re: no power to one injector
No, you got to be careful of the wiring harness you get for your car or truck . The slightest differs in years, motor size , and trans. will keep it from functioning right. the computers differ from year to year
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Not usually. They use the same power source but are grounded at different times by the engine computer.
Its possible one bad injector could damage the others, but that rarely happens.
An injector is an electric valve with a small coil and magnet inside.
If all injectors are working but #2 the power supply should be ok as there is one fuse for all injectors controlling power. However, I would check for power anyway at the injector harness to ensure there is no wiring issue. The ground side is controlled by a driver inside the computer. If power is good then there is a grounding issue causing the injector not to operate. Either the computer has an internal fault or the ground wire from the computer to the injector has a break/high resistance
Don't know of a Liberty, so I looked at a '90 Legacy. The injector power wire comes from a fused source, and it is spliced, probably in the injector harness, to go to all injectors.
When it is acting up-no power to one injector-you need to ohm that injector power wire. Unplug the injector harness connector, then unplug that injector connector, and put an ohmmeter from the harness connector to the injector connector. See what resistance to current is in that wire: if anything other than a very low ohm value, there is a break or bad connection at the splice. It can be repaired or the injector harness can be replaced. Post back if you need further help or don't understand.
I would check the wires that make the injector function to see how much power is going to them (using a multimeter). Now check the wires on the injector that is not working and see if you have power there. If you do then you have a bad injector. I don't think you do since you said that you switch wires and you are getting fuel at that injector. Check your wiring harness for shorted out wires. It doesn't make sense for one side to be working and the other not to be. I don't think it is a problem with your ECU, but it may be. See what colors the wires are going to your injectors and trace them back to the ECU, a wiring diagram would help. You need to check to see if you are getting power from the control module to the harness. I believe, however, you are experience a shorted out wire somewhere in the harness. That is where I would start. If you confirm you are getting power to the control module, but you are losing it somewhere in the harness it may be easier to just run a new set of wires instead of tearing apart the harness.
It is either a faulty fuel injector for cylinder 29try swapping injectors); or the coil module that sends signals to the individual coils..it is mounted inside the air cleaner housing., black in color, rectangular with a harness entering one side and exiting the other..
Well you need to check the harness to see if it is getting power. You may need to take the plentum off and then unplug the harness and then reinstall the plentum but make sure that you leave the harness out so you have access to it.
Then you can make a test light or purchase one. Plug the test light into the harness and start the car. This light should flicker, if not you didn't repair the wire properly. Doesn't sound like a fuse being that none of the injectors would work if a fuse blew.
It could also be that the PCM grounded out when the mouse chewed the wire and needs to be replaced.
Don't worry about checking the ASD Relay because that would cut off all power to the injectors and coils.