s30kid Posted August 3, 2012 Share Posted August 3, 2012 So, My 77 280z doesn't run. I checked everything and came to the conclusion that there is no power going to the injectors. I used a screwdriver to check if they click, There is no click. I used a 12Volt light, stuck the red and black wires into the injector harness (I checked every connector) no light at all. I read the 280z fuel injection bible, no help really. The car starts and then dies, which means that the cold start valve works but the injectors are not firing. I checked if the injector resistor (I think that is what it is called..) clicks when the car starts, it does. Any help is greatly appreciated. Quote Link to comment Share on other sites More sharing options...
Silverone858 Posted August 6, 2012 Share Posted August 6, 2012 How long has it been sitting? You sure the pump is working? And the fuel filter is good? Quote Link to comment Share on other sites More sharing options...
s30kid Posted August 6, 2012 Author Share Posted August 6, 2012 The fuel pump is good I hear it come on when I push the flap it the AFM. The fuel filter is brand new What's weird is I got a inline fuel pressure gauge and it reads over 40psi when cranking. But the car never starts because the injectors don't fire. The car has been sitting for at least 7 years but I got it up and running a few months ago. But it leaked fuel from the injector hoses so I pulled the whole injection rail off. Cleaned it. New hoses. The works. Put it back on and it never ran after that. Quote Link to comment Share on other sites More sharing options...
s30kid Posted August 9, 2012 Author Share Posted August 9, 2012 UPDATE: I took a Volt Meter the the injector harness and I put the + to one pin on the harness, and the negative to a ground Bolt on the fire wall. When in the "on" position it had 12v. I checked every injector plug. They all gave me 12v. But when I put the + in one and the - in the other pin and cranked the motor I had 0 voltage. So with my basic knowledge of how injectors fire, I have no ground to the injectors switching them open. Where could I have a bad ground at causing the injectors to not fire? I read that the negative on the coil controls the ground on the injectors. Is this true? And also, I read that the problem could be my Fuel injection relay mounted under the driver side dash. The injection relay controls the 12v feed and the fuel pump turning on right? (My pump turns on when I push the flap in the AFM) So if I have 12v going to the injector it cant be the relay correct? Quote Link to comment Share on other sites More sharing options...
evildky Posted August 15, 2012 Share Posted August 15, 2012 The injectors work on saturated voltage and fire on a square wave signal. You need noid lights, a logic probe or similar to detect the trigger. Quote Link to comment Share on other sites More sharing options...
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