280zdude Posted December 25, 2020 Author Share #49 Posted December 25, 2020 (edited) So basically I put starter fluid down the intake and i got huge back fire out of the intake! so I tried it another way and took the spark plugs out and shot some in there.. but the car did not run for a little while it.. kind of turned over quicker? Never used starter fluid But I didn’t spray too much. Couple squirts just wanting to say- someone definitely played with the fuel system it was disconnected and plugged.. Merry Christmas! Edited December 25, 2020 by 280zdude Link to comment https://www.classiczcars.com/topic/64893-no-spark-issue-negative-voltage-on-ignition-switch/?page=5#findComment-613276 Share on other sites More sharing options...
280zdude Posted December 25, 2020 Author Share #50 Posted December 25, 2020 On 12/23/2020 at 5:26 PM, Zed Head said: The injectors and fuel rail might be fine or they might be rusty. It's hard to say. Disconnect a few lines and look inside. Fuel filter and cold start valve are easy to get to. The Body Electrical chapter shows where all of the relays are and has a drawing of the fuse box. Also has many small wiring diagrams that are very detailed. Spend some time there, and in Engine Electrical and in Engine Fuel. The 1977 manual isn’t in the manual was sent me early Link to comment https://www.classiczcars.com/topic/64893-no-spark-issue-negative-voltage-on-ignition-switch/?page=5#findComment-613277 Share on other sites More sharing options...
SteveJ Posted December 25, 2020 Share #51 Posted December 25, 2020 9 hours ago, 280zdude said: So basically I put starter fluid down the intake and i got huge back fire out of the intake! so I tried it another way and took the spark plugs out and shot some in there.. but the car did not run for a little while it.. kind of turned over quicker? Never used starter fluid But I didn’t spray too much. Couple squirts just wanting to say- someone definitely played with the fuel system it was disconnected and plugged.. Merry Christmas! That is likely a timing issue or the intake valves aren't closing tightly enough. It's difficult to guess without examining the engine. However, I suggest you get your fuel system working right. In the meantime other things to consider is adjusting the valves. Adjusting them cold is not the preferred way, but it will work. Link to comment https://www.classiczcars.com/topic/64893-no-spark-issue-negative-voltage-on-ignition-switch/?page=5#findComment-613284 Share on other sites More sharing options...
wal280z Posted December 26, 2020 Share #52 Posted December 26, 2020 On 12/23/2020 at 4:23 PM, 280zdude said: http://www.atlanticz.ca/zclub/techtips/wiringdiagrams/F77ZCAR-WIRING1.pdf This is the wiring diagram I have been using for 1977 280z Many errors have been found in that version and fixed with later revisions, It is now Revision 'N' The diagram in the download section is the diagram that you need. 2 Link to comment https://www.classiczcars.com/topic/64893-no-spark-issue-negative-voltage-on-ignition-switch/?page=5#findComment-613318 Share on other sites More sharing options...
Zed Head Posted December 27, 2020 Share #53 Posted December 27, 2020 Thanks, I finally figured out why the version I had has an F in front of the file name. Updated mine to this new version. Link to comment https://www.classiczcars.com/topic/64893-no-spark-issue-negative-voltage-on-ignition-switch/?page=5#findComment-613348 Share on other sites More sharing options...
280zdude Posted December 27, 2020 Author Share #54 Posted December 27, 2020 Update on the fuel electrical.. I’m getting .03- .05v to the pump wires. I’m guess it may be a bad ground or relay? Link to comment https://www.classiczcars.com/topic/64893-no-spark-issue-negative-voltage-on-ignition-switch/?page=5#findComment-613384 Share on other sites More sharing options...
280zdude Posted December 27, 2020 Author Share #55 Posted December 27, 2020 2 minutes ago, 280zdude said: Update on the fuel electrical.. I’m getting .03- .05v to the pump wires. I’m guess it may be a bad ground or relay? Link to comment https://www.classiczcars.com/topic/64893-no-spark-issue-negative-voltage-on-ignition-switch/?page=5#findComment-613385 Share on other sites More sharing options...
SteveJ Posted December 27, 2020 Share #56 Posted December 27, 2020 Describe the testing conditions: Key position? AFM flap? If the key is on ON with the flap closed, the relay is not going to complete the circuit to supply power to the fuel pump. Link to comment https://www.classiczcars.com/topic/64893-no-spark-issue-negative-voltage-on-ignition-switch/?page=5#findComment-613386 Share on other sites More sharing options...
280zdude Posted December 27, 2020 Author Share #57 Posted December 27, 2020 The fuel pump relay does click when you put the car in the on position. How do I check if the voltage coming out of the relay is around 12 volts? Can I tried to unplug the connection between the relay and the green and blue wire in the car but it seems to turn the relay off. Link to comment https://www.classiczcars.com/topic/64893-no-spark-issue-negative-voltage-on-ignition-switch/?page=5#findComment-613387 Share on other sites More sharing options...
SteveJ Posted December 27, 2020 Share #58 Posted December 27, 2020 You will need a probe that can reach inside the connector at the fuel pump relay. That will also mean you will need someone to move the flap in the AFM while you are measuring voltage. You will not see voltage for the fuel pump relay unless the key is in START or unless the key is in ON with the AFM flap open. Link to comment https://www.classiczcars.com/topic/64893-no-spark-issue-negative-voltage-on-ignition-switch/?page=5#findComment-613388 Share on other sites More sharing options...
280zdude Posted December 28, 2020 Author Share #59 Posted December 28, 2020 45 minutes ago, SteveJ said: Describe the testing conditions: Key position? AFM flap? If the key is on ON with the flap closed, the relay is not going to complete the circuit to supply power to the fuel pump. Key is on the on position afm untouched. I will try that. But when the car is on and fuel pump doesn’t make any sound. I will also do the probe suggestion! And let you guys know what I find out Link to comment https://www.classiczcars.com/topic/64893-no-spark-issue-negative-voltage-on-ignition-switch/?page=5#findComment-613389 Share on other sites More sharing options...
Zed Head Posted December 28, 2020 Share #60 Posted December 28, 2020 Link to comment https://www.classiczcars.com/topic/64893-no-spark-issue-negative-voltage-on-ignition-switch/?page=5#findComment-613391 Share on other sites More sharing options...
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