One coil pack not firing, suggestions?

[MountainDew]

95 Talon AWD Turbo
Firing order 4-1-2-3


After a valve job the engine will not run properly. It runs rough and shakes and then dies. After some trouble shooting I determined that cylinders 1&4 will fire but 2&3 have no spark at all. I switched signal wires from working coil pack on the left with the right coil pack and the problem moved with the wire switch. I had the same results when I moved the plug wires. I even tried a friends working coil pack with the exact same results.

This tells me that I’m not getting the signal to fire the right coil pack. I’ve checked all the obvious things like wiring connections, shorted/grounded wires and haven’t found anything.

Does anyone have any suggestions?

 

[luv2rallye]

Check the connector pins and grounding points for good connections (clean, tight, no corrosion). Low current wires are not usually a big deal to have a few ohms and they often do. High current wires (5A or more like power transistor, alt, starter, etc) however have a significant voltage drop across even 1 ohm and so will have problems.

 

[nicholasramos]

Thanks a bunch luv2rallye

It looks like the grounds on the battery, block, and firewall behind the tray and behind the intake are all in good shape.

I'm hoping this rules out grounding as the source of my p0300 issue. I'll keep ruling things out.

 

[Colt4G63 also]

Is there an easy easy to take it off or do I have to get the timing cover off again? :/

Test them in the car. The crank sensor is the triangular plug, and cam sensor is the flat one.

Sorry for the five year late response. Stepping away from the keyboard.