volfan98 Posted March 10, 2012 Share Posted March 10, 2012 Hey guys, i've swapped a 1983 L28ET into my 77 280Z. Car cranks but doesn't start. I know I have fuel pressure at the rail but after cranking the plugs are still dry and no smell of gas, so i think my injectors aren't firing. I want to check continuity from the coil to the ECU - is it pin 5 of the turbo ecu that goes through the tach to the coil? Thanks! Quote Link to comment Share on other sites More sharing options...
Cannonball89 Posted March 10, 2012 Share Posted March 10, 2012 Download the FSM here http://www.xenons130.com/reference.html That will give you instructions for all the pin-test diagnostics. Check to make sure you have spark too. If you have no spark and the injectors are not opening then your CAS probably isn't sending a signal to the ECU. Make sure your ECU has power when cranking too. And of course poor grounding could be the culprit too. Quote Link to comment Share on other sites More sharing options...
volfan98 Posted March 10, 2012 Author Share Posted March 10, 2012 ECU has a green light Injectors have power to them. Coil has power to it. Thanks! Quote Link to comment Share on other sites More sharing options...
volfan98 Posted March 10, 2012 Author Share Posted March 10, 2012 Ok, I put a christmas tree light on an injector connector and it flashes when cranking, so I think most of the injectors are stuck shut. Quote Link to comment Share on other sites More sharing options...
Cannonball89 Posted March 10, 2012 Share Posted March 10, 2012 Yea if the injectors are opening you should be able to hear a pretty loud "click click click" when cranking. It wouldn't hurt to check the voltage at the injector connectors though. A tired battery might not have the juice to fully open the injectors, especially after prolonged cranking. Just for fun, lay a spark plug on the valve cover and crank it. You should be able to see a spark (you might need to be in a garage with the lights out though). Just because you have power to the coil doesn't mean that it is sending spark to the plugs. A neat little trick I used when I was getting my 280zx running was to disconnect the fuel pump so the fuel rail stayed dry, and lay all six spark plugs on the valve cover, using tape to hold them. I then pulled the distributor out of the engine, and leaving everything hooked up and the key in the "on" position, I turned the distributor by hand and could see all six plugs sparking and hear the injectors clicking clearly. This is a pretty simple way to ensure that everything is working properly. Quote Link to comment Share on other sites More sharing options...
s30red240z Posted March 11, 2012 Share Posted March 11, 2012 There is a connector that has 6 green wires and heavy black ground wires pins are 101 102 103 104 105 106, with the engine key off, ground each wire with the connector unplugged, ground each wire 101 102 103 104 105 106 to chassis ground you have to see a little sparks between ground wire and the other wire, if you don't have that, you don't have the 12v feed to the injectors. your fuel pump relay must be work and spark too. Quote Link to comment Share on other sites More sharing options...
Silverone858 Posted July 3, 2012 Share Posted July 3, 2012 Did you find a solution? I have the same problem in my 73 also swapping in an 83 L28ET I had to stop working on this car till later this month but I saw this thread and thought I would see what the verdict was. Quote Link to comment Share on other sites More sharing options...
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