L-Jet Injectors Aren't Getting Ground, L-Jet Injectors Options

[nmkimosabe]

After a thorough investigation, it appears that the injectors are not getting ground to fire properly on my 1974 1.8L. Maybe it's an air flow sensor issue but not sure. All the other wiring seems to be okay. I would appreciate any thoughts from the knowledgeable folks on this forum. Thank you.

[nmkimosabe]

Well 2 weeks and learning a lot about L-jet injection systems the problem appears solved. Per the recommendations from many qualified contributors, I did a comprehensive check of the AFM sensor / plug, fuel pressure, fuel rails, injector voltage, injectors, cold start valve, cylinder head temp sensor, fuel pressure regulator, spark, fuel pump, ground wires, coil, harness wires, dual relay, resistor pack and more importantly the ECU itself. By swapping out an ECU with a friend the car seemed to start and run better but still for a limited time. Thus, it was determined that the cylinder head temp sensor was faulty as it ran fine when we manually operated the throttle and got the car warm. I'm still not sure which was a bigger issue, the ECU or the cylinder head temp sensor.

Next, I have to replace the cylinder head temp sensor which is somewhat challenging on a 1.8L as the sensor is hidden under the intake runner at the #3 cylinder. It could also be a broken wire in the harness but it's hard to get to it because of the runner location. If anyone out there has any suggestions to make this easier as it will be greatly appreciated. My mechanical and voltmeter skills have greatly increase as a result of this frustrating yet worthwhile learning experience. I THANK ALL THAT HAVE CONTRIBUTED!