You're right, there is no ground wire. The injectors and coils are fed 12 volts from the Automatic Shutdown relay. The grounds are switched on and off by the engine computer to fire them.
The 12 volts to the coils and injectors comes from the ASD relay for 2 seconds after turning on the ignition switch, then it turns off. It turns on again when the engine computer sees engine rotation, cranking or running. It knows this from the pulses from the crankshaft and camshaft position sensors.
Camshaft position sensors fail quite often. If you got one with the new engine, try using your old one. Crankshaft sensor air gap is critical. The dealer can supply a paper spacer to stick on the end of it, then you shove it in as far as it will go and tighten the bolt. The spacer will slide off when you crank the engine.
Measure for 12 volts on the coil or injector power wire while cranking. If it's missing, the ASD relay isn't turning on. Check the cam and crank sensors. If it is turning on, and you have spark, try giving it a little gas, (pressing the pedal). If it starts, but won't stay running without your foot on the pedal, it just needs to relearn minimum throttle so the computer knows when to be in control of idle speed. You do that by driving at highway speed, then coasting for at least seven seconds without touching the gas or brake pedals.
Wednesday, November 22nd, 2017 AT 6:03 PM