72 csi won't start

[Finallymy73]

All -

72 csi not starting properly. Runs with starter fluid, fuel pump is working, there is fuel pressure in fuel rail, both wires in all injector connectors are showing ground. Ground does not change when try to start engine. Is this correct or is this potentially my issue? Cold start injector is working properly. MPC does hold vacuum. Hunch is ECU is shorting or there is an issue with wiring harness as both wires in the connector are showing ground.

Any advice would be greatly appreciated.

Cheers,
Bob

 

[Finallymy73]

All - I realized after rereading my original question, I may not have been totally clear about the issue.

To elaborate, I purchased a 1972 csi that had been sitting for 10+ years. The engine is in pretty good shape and I am attempting to get it in running order before sending it to the body shop. I started with the fuel tank. It had a thick layer of old fuel mud from sitting for so long. After totally rehabbing the fuel tank to working condition (I love POR15!), I rebuilt the fuel pump and installed a new fuel filter. So here I am. I am getting fuel to the fuel rail and the car does not start. It turns over fine but does not fire unless I spray starter fluid. So the injectors are not working for some reason. The electrical signal to the injectors does not change when the key is turned. A test light connected to the positive side of the battery glows when I probe the wires in the connectors that go to the injectors. The wiring on the car is all in above average condition and is not suspect.

Any trouble shooting ideas would be extremely appreciated as I am scratching my head at the best next steps.

Thanks in advance!
Bob

 

[DerSchwede]

Clean ALL grounds between the body and
1. Battery
2. Engine block
3. D-jet harness

If that dors not help, pull out the trigger points from the lower part of the dizzy and either clean them VERY carefully or better still since they are quite old - replace them. If they are dirty or wore down - they are one of the most common sources for D-jet errors since the injectors are triggered by them.

Cheers
Anders

 

[Stefan]

Quick test you can do for checking the injectors working electric is to turn on ignition and then by hand affect the throttle. You will clearly hear how it "snaps" several times in one of the injectors. (This is due to additional injection pulses controlled from the throttle valve switch)

 

[sfdon]

It appears that you are not getting a ground signal to your injectors. Ground to the coil creates the spark and ground to the injector creates the spray of fuel.
After cranking verify by checking for a dry spark plug.