So the old girl had been running fine, but one day I started it, she ran for a few seconds, and then cut out. Cranks, but doesnāt start. I checked that the fuel pump was running as that has been an ongoing issue with this car, and it was. Also getting spark. Cranking seemed to be a bit more sluggish than before even though the battery is in good shape.
I checked the injector harness, and it is showing +12v on both sides of injector connector. Thatās not right is it? On other injector systems Iāve worked on, one side is +12v and the other is grounded through the ECU. Is that the same on these cars? Anyone have a wiring diagram for the ECU?
Have you tried the key cycling trick? Turn the ign. key between off and the 2nd position 5-6 times then try to start the car. You might have a low fuel pressure. You can also check the ignition relay.
Never worked on an XJ40 but on the V12s and older XJ6s, with KOEO, both sides are 12v ā+ā until the ECU grounds one sideā¦which obviously isnāt happening in your case.
Thanks DD on the tip about +12v on both sides of the plug. Focusing my attention on the apparent lack of power now. Ruled out the batteryā¦ Could be a bad cable somewhere, and Iāll start doing drop voltage tests to isolate that. I also plan on testing the resting current draw. I have an icky feeling that a module somewhere is shorted out and putting a load on the system.
