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Earl is right here! You should read +12 volt at both sides of injectors when ignition is On and engine not cranking or running (meassured between one wire and ground at a time). If one side reads zero in same condition, either is all injectors grounded permanently or injector coils broken. If grounded permanetly, the DME is at fault, probably the circuit that control the switching of injectors to ground (a shorted transistor perhaps). On the other side.... if all coils are broken what would be the reason? Hmm, the same transistor shorted as mentioned as it carry amps continously through coils to ground which they dont can handle very long I guess.
I take it that you can make meassurement at both sides of the injectors while ignition is ON. It can be a little complicated as you have to slide back the booths and get to the wires.
So, if you get +12 volt across them with engine not cranking, the DME is shot or you have a short to ground somewhere else (between one side of each injector and chassi ground).
In your shoes I would pull DME out of the car and pull all contacts from the injectors thereby have the injector grounding circuit "hanging in the air" so to say. Then take a resistace reading between all injector contacts and ground. Now, if you get a reading of around 0.4-0.5 ohm (from meter wires) you will have a short somewhere. Test all connectors to chassi and make a note here at which cylinder this occured. Remember that injector 1 & 2, 3 & 4 are in pairs so a short can be in 1 or 2, 3 or 4 respectively. If readings show open at all injectors, the wires are OK. Refit DME in car and repeat meassurement between chassi and each wire at the injectors. If 0.4-0.5 ohm (from meter wires) DME is shot (shorted at pin 14 & 15).
And lastly, take resistance readings across each injector before you refit contacts to them. Do you get around 2.5 ohm or are they open? If 2.5 ohm they are elecrically OK but could be jammed to not to open as mentioned by other very knowledgeable Pelicans here.
Dont give up and good luck!
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Lapponia
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