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Showing results for tags 'injector'.
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Hey Everybody, A few months ago I acquired myself a rust bucket 76' 280z (mainly for parts and drivetrain) I want to get the engine running to confirm that it is worthy of holding onto. Somehow I cannot get the injectors to pulse. The car fires right up when hit with ether and will run as long as ether is supplied. BEFORE everyone goes ahead and says it I DO have the EFI BIBLE and have gone through it best of my ability to follow the testing suggestions. What I've done so far: Pulled all 6 injectors, tested that they open and produce fuel, not clogged. Have a NEW Fuel pump hooked right up to the fuel line. Connected back at the tank so that the pump activates when cranking. Checked all four fusible links on passenger side of car with volt meter. All seem good. Ran a Negative jumper from coil to pin 1 in the ecu. To eliminate bad ground wiring in harness. Checked pin 10, 20 for fuel pump circuit and relay. Injectors have a current, they are lacking their ground from the ecu when I crank. Did a pulse test ( ran a negative to the - terminal of coil, with key On grounded it on the body quickly to check for pulse) got all six injectors to pulse a few times. They only pulsed a couple times and then this didnt work anymore.) From here I'm not sure what else to do. I read that maybe I should check out the dropping resistors? How would I test these? Also how would I test the EFI Relay? Thanks in advance -
Recently bought a Z and am sorting out the issues. It runs albeit on the 3 rear cyclinders. New fuel pump, new NGK wires and plugs, distributor looks like it was replaced not long ago. Coil looks original (new MSD blaster in the mail). I know it's getting fuel, spark and air. I know all 6 injectors are functional. Just not all at the same time. When I crank it, it starts almost instantly, when I place my screw driver to each injector, only the rear bank makes the clicking. Removing any of the front 3 injector pig tails doesn't affect idle. When i place the rear 3 injector connections on the front 3, once again it starts and idles the same. Is this a fault in the first bank wiring harness? A dropping resistor issue, faulty ECU? Currently I only have the FSM available on my phone and I'm diving through it but I feel overwhelmed. I checked the pins with a multimeter and each injector is getting current. Did I miss something simple? Thank you for reading. Hope to hear from you guys soon. PS, I bought all new injector connections, but that doesn't seem to be the issue despite them being worn. Haven't installed yet.