No Injector Pulse on 83 ZXT swap

[GHtokyo]

83ZXT in '75z New pistons 8.5:1 compresson.

Problem: Car is not starting

Fuel pump is working, Have spark(not perfectly timed, but in the ballpark)

 

I think I've connected and Ohmed out everything I need on the wiring harness from the sensor to the ECU. Right now, I am not running a Vacuum Control Modulator, or Air Regulator (only '75 Throttle Body with Ol' Skool Idle adjustment screw) IAC (whatever that is) is not being used. New Cylinder head temp sensor. Grounds are good I think. I have checked the MAF for voltages. It has some voltage from the ECU (8.5v) I ohmed it out at 300-400ohms. I checked the injector wires for voltage while cranking and 0v was discovered.

 

What could be causing this I wonder....I searched.

 

Apparently injuctor pulse/firing is based off Intake air Volume and RPM and TPS I gather? All of those sensors are connected.

Any other thoughts? Anyone?

[GrayZee]

What do you mean you checked for voltage at the injectors? The pulses from the ecu come in the form of a - ground to the injectors. The injector plugs should have 12v+ at all times. It is connected directly to the battery via a fuseable link. If you do not have the 12v+ I would check your links/connections.

[GHtokyo]

Ok, Yes, This was exactly my problem. I was using this wiring diagram and it failed to show that one side of the injectors is connected to constant 12v.

I looked at another wiring diagram and it has it there, so I know this is correct.

Thanks for the help...the car is running, leaking coolant, but running. The timing is a little off, maybe a tooth too retarded...darn!

 

 

See Correction on the Left Side.